Hard core attraction in hadron scattering and the family of the Ds meson molecule
Pedro Bicudo
We study the discovered Ds(2317) at BABAR, CLEO and BELLE, and find that it belongs to a class of strange multiquarks, which is equivalent to the class of kaonic molecules bound by hard core attraction. In this class of hadrons a kaon is trapped by a s-wave meson or baryon. To describe this class of multiquarks we apply the Resonating Group Method, and extract the hard core kaon-meson(baryon)interactions. We derive a criterion to classify the attractive channels. We find that the mesons f0(980), Ds(2457), Bs scalar and axial, and also the baryons with the quantum numbers of $\Lambda, \Xi_c, \Xi_b$ and also $\Omega_{cc}, \Omega_{cb}$ and $\Omega_{bb}$ belong to the new hadronic class of the Ds(2317).
aipcheck.tex
%
% $Id: aipcheck.tex,v 1.7 2002/01/11 19:50:46 frank Exp $
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Testing for potential problems with this class
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newif\ifproblem
\newif\iftimesok

\makeatletter
\def\IfStandaloneCheck{\def\next{aipcheck}
  \edef\currjob{\jobname}
  \edef\next{\meaning\next}
  \edef\currjob{\meaning\currjob}
  \ifx\currjob\next
    \expandafter\@firstoftwo
  \else
    \expandafter\@secondoftwo
  \fi
}
\makeatother

\typeout{***********************************************}
\typeout{*}
\typeout{* Testing if all files required for the aipproc}
\typeout{* class are available ...}
\typeout{*}
\typeout{***********************************************}

\typeout{*}
\typeout{* Looking for LaTeX2e ... }
\ifx\documentclass\undefined
 \typeout{*}
 \typeout{* Sorry this is a fatal error:}
 \typeout{*}
 \typeout{* The aipproc class can only be used with LaTeX2e which is}
 \typeout{* the standard LaTeX since 1994!}
 \typeout{*}
 \typeout{* Please make sure that your version of LaTeX is up-to-date}
 \typeout{* before attempting to use this class.}
 \typeout{*}
 \expandafter\stop
\else
 \typeout{* ... ok }
\fi


\def\next#1/#2/#3\next{#1#2}
\typeout{*}
\typeout{* Testing that LaTeX2e is not too old ... }
\ifnum\expandafter\next\fmtversion\next<199612 \relax
 \typeout{* ... what a vintage! }
 \typeout{*}
 \typeout{* Sorry this is a fatal error:}
 \typeout{*}
 \typeout{* The aipproc class can only be used with a recent version}
 \typeout{* of LaTeX2e. Your version is dated \fmtversion\space --- but}
 \typeout{* at least the 1996/12/01 version is required!}
 \typeout{*}
 \typeout{* Please make sure that your version of LaTeX is up-to-date}
 \typeout{* before attempting to use this class.}
 \typeout{*}
 \expandafter\stop
\else
 \ifnum\expandafter\next\fmtversion\next<199806 \relax
   \typeout{* ... probably ok }
   \typeout{*}
   \typeout{* Your version of LaTeX2e is quite old --- the aipproc class}
   \typeout{* hasn't been tested with your release.}
   \typeout{*}
   \typeout{* We believe that it will probably work, but if you encounter}
   \typeout{* problems you will need upgrade your installation.}
   \typeout{*}
   \typein{* Type <return> to continue ...}
   \problemtrue
 \else
   \typeout{* ... ok }
 \fi
\fi


\typeout{*}
\typeout{* Looking for aipproc.cls ... }
\IfFileExists{aipproc.cls}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* Before you can use the aipproc class you have to unpack}
     \typeout{* it from the documented source.}
     \typeout{*}
     \typeout{* Run LaTeX on the file 'aipproc.ins', e.g.,}
     \typeout{*}
     \typeout{* \space\space latex aipproc.ins}
     \typeout{*}
     \typeout{* or whatever is necessary on your installation to process}
     \typeout{* a file with LaTeX. This should unpack a number of files for you:}
     \typeout{*}
     \typeout{* aipproc.cls \space and \space aip-*.clo}
     \typeout{*}
     \typeout{* After that retry processing this guide.}
     \typeout{*}
     \stop
}

\typeout{*}
\typeout{* Looking for aipxfm.sty ... }
\IfFileExists{aipxfm.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The aipxfm.sty file which is part of the aipproc distribution}
     \typeout{* must be installed in a directory which is searched by LaTeX.}
     \typeout{*}
     \typeout{* Please install this file and retry.}
     \typeout{*}
     \stop
}

\typeout{*}
\typeout{* Looking for aip-8s.clo ... }
\IfFileExists{aip-8s.clo}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The aip-8s.clo file which is part of the aipproc distribution}
     \typeout{* must be installed in a directory which is searched by LaTeX.}
     \typeout{*}
     \typeout{* Please install this file and retry.}
     \typeout{*}
     \stop
}

\typeout{*}
\typeout{* Looking for aip-8d.clo ... }
\IfFileExists{aip-8d.clo}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The aip-8d.clo file which is part of the aipproc distribution}
     \typeout{* must be installed in a directory which is searched by LaTeX.}
     \typeout{*}
     \typeout{* Please install this file and retry.}
     \typeout{*}
     \stop
}


\typeout{*}
\typeout{* Looking for aip-6s.clo ... }
\IfFileExists{aip-6s.clo}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The aip-6s.clo file which is part of the aipproc distribution}
     \typeout{* must be installed in a directory which is searched by LaTeX.}
     \typeout{*}
     \typeout{* Please install this file and retry.}
     \typeout{*}
     \stop
}


\typeout{*}
\typeout{* Looking for aip-arlo.clo ... }
\IfFileExists{aip-arlo.clo}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The aip-arlo.clo file which is part of the aipproc distribution}
     \typeout{* must be installed in a directory which is searched by LaTeX.}
     \typeout{*}
     \typeout{* Please install this file and retry.}
     \typeout{*}
     \stop
}

\typeout{*}
\typeout{* Looking for fixltx2e.sty ... }
\IfFileExists{fixltx2e.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found, trying fix2col.sty instead ... }
     \typeout{*}
     \IfFileExists{fix2col.sty}
	 {
	  \typeout{* ... ok }
	 }
	 {
	  \typeout{* ... not found! }
	  \typeout{*}
	  \typeout{* Sorry this is a fatal error:}
	  \typeout{*}
	  \typeout{* Your LaTeX distribution contains neither fixltx2e.sty}
	  \typeout{* nor fix2col.sty.}
	  \typeout{*}
	  \typeout{* This means that it is either too old or incompletely}
	  \typeout{* installed.}
	  \typeout{*}
	  \typeout{* fixltx2e.sty is part of the standard LaTeX distribution}
	  \typeout{* since 1999; fix2col.sty is an earlier version of this}
	  \typeout{* package.}
	  \typeout{*}
	  \typeout{* Best solution is to get the latest LaTeX distribution.}
	  \typeout{* If this is impossible for you, download fix2col.sty.}
	  \typeout{* You can get this software from a CTAN host.}
          \typeout{* Refer to http://www.ctan.org and search for "fix2col".}
	  \typeout{*}
	  \typeout{* After you have updated your LaTeX distribution}
	  \typeout{* retry processing this guide.}
	  \stop
     }
}

\typeout{*}
\typeout{* Looking for fontenc.sty ... }
\IfFileExists{fontenc.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The fontenc package, which is part of standard LaTeX}
     \typeout{* (base distribution) has to be installed at the site to}
     \typeout{* run the aipproc class.}
     \typeout{*}
     \typeout{* The fact that it cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* improperly.}
     \typeout{*}
     \typeout{* Please make sure that your version of LaTeX is okay}
     \typeout{* before attempting to use this class. The LaTeX distribution}
     \typeout{* contains the file "ltxcheck.tex" which can be used to}
     \typeout{* test the basic functionality and integrity of your installation.}
     \typeout{*}
     \stop
    }

\typeout{*}
\typeout{* Looking for calc.sty ... }
\IfFileExists{calc.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Sorry this is a fatal error:}
     \typeout{*}
     \typeout{* The calc package, which is part of standard LaTeX}
     \typeout{* (tool distribution) has to be installed at the site}
     \typeout{* to run the aipproc class.}
     \typeout{*}
     \typeout{* The fact that it cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts.}
     \typeout{*}
     \typeout{* Please make sure that the tools distribution of LaTeX}
     \typeout{* is installed before attempting to use this class.}
     \typeout{*}
     \typeout{* (You might be able to get calc.sty separately for your}
     \typeout{* installation if you are unable to upgrade to a recent}
     \typeout{* distribution for some reason.)}
     \typeout{*}
     \stop
    }

\typeout{*}
\typeout{* Looking for varioref.sty ... }
\IfFileExists{varioref.sty}
    {
     \typeout{* ... ok }
     \gdef\variorefoptionifavailable{varioref,}
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Problem detected:}
     \typeout{*}
     \typeout{* The varioref package, which is part of standard LaTeX}
     \typeout{* (tool distribution) is not installed at this site.}
     \typeout{*}
     \typeout{* The fact that it cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts.}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you cannot make use of the options "varioref" or "nonvarioref".}
     \typeout{*}
     \typeout{* Please also note that the aipguide.tex documentation}
     \typeout{* normally uses the "varioref" option to show its}
     \typeout{* effects (which  will now fail).}
     \typeout{*}
     \typein{* Type <return> to continue ...}
     \problemtrue
     \gdef\variorefoptionifavailable{}
     \let\vpageref\pageref
     \let\vref\ref
    }

\typeout{*}
\typeout{* Looking for times.sty ... }
\IfFileExists{times.sty}
    {
     \begingroup
% load times and forget it immediately again
       \RequirePackage{times}
       \global\expandafter\let\csname ver@times.sty\endcsname\relax    
       \long\def\next{ptm}
       \ifx\rmdefault\next
         \typeout{* ... ok }
         \gdef\psnfssproblemoption{}
         \endgroup
         \timesoktrue
       \else
         \endgroup
     \typeout{* ... obsolete! }
     \typeout{*}
     \typeout{* Serious problem detected:}
     \typeout{*}
     \typeout{* The times package, which is part of standard LaTeX}
     \typeout{* (psnfss distribution) is obsolete at this site.}
     \typeout{*}
     \typeout{* The fact that it contains incorrect code either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts with old files remaining!}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but}
     \typeout{* you have to specify the option "cmfonts" which result in}
     \typeout{* documents which are not conforming to the AIP layout specification!}
     \typeout{*}
     \typeout{* You can also try using the class in the following way:}
     \typeout{*}
     \typeout{* \space\space \string\documentclass[cmfonts]{aipproc}}
     \typeout{* \space\space \string\usepackage{times}}
     \typeout{* \space\space ...}
     \typeout{*}
     \typeout{* With luck this will result in Times Roman output but chances}
     \typeout{* are that you will get a larger number of error messages in}
     \typeout{* which case you have to remove the \string\usepackage declaration.}
     \typeout{*}
     \typein{* Type <return> to continue ...}
          \problemtrue
          \gdef\psnfssproblemoption{cmfonts}
          \def\textdegree{$^\circ$}            % used below but now
                                               % not setup
       \fi
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Serious problem detected:}
     \typeout{*}
     \typeout{* The times package, which is part of standard LaTeX}
     \typeout{* (psnfss distribution) can not be found.}
     \typeout{*}
     \typeout{* The fact that this package cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts!}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you have to specify the option "cmfonts" which result in}
     \typeout{* documents which are not conforming to the AIP layout specification!}
     \typeout{*}
     \typein{* Type <return> to continue ...}
     \problemtrue
     \gdef\psnfssproblemoption{cmfonts,}
    }

\iftimesok % don't bother testing other font options if times already
           % bad

\typeout{*}
\typeout{* Looking for t1ptm.fd or T1ptm.fd ... }
\IfFileExists{t1ptm.fd}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found, trying T1ptm.fd ... }
     \IfFileExists{T1ptm.fd}
          {
           \typeout{* ... ok }
          }
          {
           \typeout{* ... not found}
           \typeout{* Serious problem detected:}
           \typeout{*}
           \typeout{* The times package, which is part of standard LaTeX}
           \typeout{* (psnfss distribution) is available but the corresponding}
           \typeout{* .fd file (defining how to load Times Roman) is missing.}
           \typeout{*}
           \typeout{* The fact that this package is only partially installed}
           \typeout{* means that you LaTeX installation is unable to use Times}
           \typeout{* Roman fonts!}
           \typeout{*}
           \typeout{* You can use the aipproc class without this package but }
           \typeout{* you have to specify the option "cmfonts" which result in}
           \typeout{* documents which are not conforming to the AIP layout}
           \typeout{* specification!}
           \typeout{*}
           \typein{* Type <return> to continue ...}
           \problemtrue
           \timesokfalse
           \gdef\psnfssproblemoption{cmfonts,}
          }
    }

\fi


\newcommand\CheckFDFile[3]{%
  \typeout{*}
  \typeout{* Looking for #1#3.fd or #2#3.fd ... }
  \IfFileExists{#1#3.fd}
    {
     \typeout{* ... ok }
    }
    {
     \IfFileExists{#2#3.fd}
      {
       \typeout{* ... ok }
      }
      {\problemtrue
       \typeout{* ... not found! }
      }
    }
}

\iftimesok % don't bother testing other font options if Times already bad

%\CheckFDFile{ot1}{OT1}{ot1ztmcm}
%\CheckFDFile{oml}{OML}{omlztmcm}
%\CheckFDFile{oms}{OMS}{omsztmcm}
%\CheckFDFile{omx}{OMX}{omxztmcm}

\typeout{*}
\typeout{* Looking for mathptm.sty ... }
\IfFileExists{mathptm.sty}
    {
     \typeout{* ... ok }
     \CheckFDFile{ot1}{OT1}{ptmcm}
     \CheckFDFile{oml}{OML}{ptmcm}
     \CheckFDFile{oms}{OMS}{pzccm}
     \CheckFDFile{omx}{OMX}{psycm}
     \ifproblem
      \typeout{*}
      \typeout{* Problem detected:}
      \typeout{*}
      \typeout{* The mathptm package, which is part of standard LaTeX}
      \typeout{* (psnfss distribution) was found but some or all of its}
      \typeout{* support files describing which fonts to load are missing!}
      \typeout{*}
      \typeout{*}
      \typeout{* The fact that this package is only partially installed}
      \typeout{* means that the mathptm package cannot be used!}
      \typeout{*}
      \typeout{* You can use the aipproc class without this package but }
      \typeout{* you have to specify the option "nomathfonts" so that}
      \typeout{* math formulas will be typeset using Computer Modern.}
      \typeout{*}
      \typein{* Type <return> to continue ...}
      \problemtrue
      \gdef\psnfssproblemoption{nomathfonts,}
     \else
      \typeout{*}
      \typeout{* Looking for mathptmx.sty ... }
      \IfFileExists{mathptmx.sty}
       {
        \typeout{* ... ok }
        \CheckFDFile{ot1}{OT1}{ztmcm}
        \CheckFDFile{oml}{OML}{ztmcm}
        \CheckFDFile{oms}{OMS}{ztmcm}
        \CheckFDFile{omx}{OMX}{ztmcm}
        \ifproblem
	  \typeout{*}
	  \typeout{* Problem detected:}
	  \typeout{*}
	  \typeout{* The mathptmx package, which is part of standard LaTeX}
	  \typeout{* (psnfss distribution) was found but some or all of its}
	  \typeout{* support files describing which fonts to load are missing!}
	  \typeout{*}
	  \typeout{*}
	  \typeout{* The fact that this package is only partially installed}
	  \typeout{* means that the mathptmx package cannot be used!}
	  \typeout{*}
	  \typeout{* You can use the aipproc class without this package but }
	  \typeout{* you have to specify the option "mathptm" (no x) so that}
	  \typeout{* math formulas use the older version with upright greek letters.}
	  \typeout{*}
	  \typein{* Type <return> to continue ...}
	  \problemtrue
	  \gdef\psnfssproblemoption{mathptm,}
        \fi
       }
       {
	\typeout{* ... not found! }
	\typeout{*}
	\typeout{* Problem detected:}
	\typeout{*}
	\typeout{* The mathptmx package, which is part of standard LaTeX}
	\typeout{* (psnfss distribution) can not be found.}
	\typeout{*}
	\typeout{* This is unfortunate but not a disaster as the older}
	\typeout{* version of the package "mathptm" (no x) seems to exist.}
	\typeout{*}
	\typeout{* You can use the aipproc class without this package but }
	\typeout{* you have to specify the option "mathptm" so that}
	\typeout{* math formulas use the older version with upright greek letters.}
	\typeout{*}
	\typein{* Type <return> to continue ...}
	\problemtrue
	\gdef\psnfssproblemoption{mathptm,}
       }
      \fi
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Problem detected:}
     \typeout{*}
     \typeout{* The mathptm package, which is part of standard LaTeX}
     \typeout{* (psnfss distribution) can not be found.}
     \typeout{*}
     \typeout{* The fact that this package cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts!}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you have to specify the option "nomathfonts" so that}
     \typeout{* math formulas will be typeset using Computer Modern.}
     \typeout{*}
     \typein{* Type <return> to continue ...}
     \problemtrue
     \gdef\psnfssproblemoption{nomathfonts,}
    }

\typeout{*}
\typeout{* Looking for mathtime.sty ... }
\IfFileExists{mathtime.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* The mathime package can not be found.}
     \typeout{*}
     \typeout{* This is not a serious problem because this package is}
     \typeout{* only of interest if you own the commerical MathTime fonts.}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you cannot use the "mathtime" option of the class.}
     \typeout{*}
     \typein{* Type <return> to continue ...}
     \problemtrue
    }
\else
\fi % iftimesok

\typeout{*}
\typeout{* Looking for graphicx.sty ... }
\IfFileExists{graphicx.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Problem detected:}
     \typeout{*}
     \typeout{* The graphics package, which is part of standard LaTeX}
     \typeout{* (graphics distribution) can not be found.}
     \typeout{*}
     \typeout{* The fact that this package cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts!}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you cannot use commands like \protect\includegraphics
                or \protect\resizebox}
     \typeout{* in this case.}
     \typeout{*}
     \typeout{* Please note that you will get a further error message below}
     \typeout{* about: "graphicx.sty not found" because the class will try}
     \typeout{* to load this package! Type return in response to that error.}
     \typeout{*}
     \typeout{* As a result the illustrations in aipguide will look strange.}
     \typeout{*}
     \typein{* Type <return> to continue ...}

     \gdef\resizebox##1##2{}
     \gdef\includegraphics{\textbf{graphics package missing:}}
     \problemtrue
    }

\typeout{*}
\typeout{* Looking for textcomp.sty ... }
\IfFileExists{textcomp.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Problem detected:}
     \typeout{*}
     \typeout{* The textcomp package, which is part of standard LaTeX}
     \typeout{* (base distribution) can not be found.}
     \typeout{*}
     \typeout{* The fact that this package cannot be found either means that}
     \typeout{* this LaTeX release is too old or that it was installed}
     \typeout{* only in parts!}
     \typeout{*}
     \typeout{* You can use the aipproc class without this package but }
     \typeout{* you will always get the error: "textcomp.sty not found"}
     \typeout{* because the class will try to load this package!}
     \typeout{* Type return in response to that error.}
     \typeout{*}
     \typein{* Type <return> to continue ...}

     \def\textdegree{$^\circ$}         % used below but now
                                       % not set up
     \problemtrue
    }


\typeout{*}
\typeout{* Looking for url.sty ... }
\IfFileExists{url.sty}
    {
     \typeout{* ... ok }
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Problem detected:}
     \typeout{*}
     \typeout{* The url package, which should be part of a good LaTeX}
     \typeout{* distribution, can not be found.}
     \typeout{*}
     \typeout{* Without this package you will not be able to use the \string\url}
     \typeout{* command. Try to download this package from a CTAN  host.}
     \typeout{* Refer to http://www.ctan.org and search for "url".}
     \typeout{*}
     \typein{* Type <return> to continue ...}

     \problemtrue
    }


\makeatletter

\typeout{*}
\typeout{* Looking for natbib.sty ... }
\IfFileExists{natbib.sty}
    {
     \IfStandaloneCheck
       {\begingroup
        \let\@listi\relax
        \let\thebibliography\@empty
        \let\bibstyle\@empty
        \RequirePackage{natbib}
        \@ifpackagelater{natbib}{1999/05/29}
	  {
           \typeout{* ... ok }
	  }{
           \typeout{* ... might be too old! }
           \typeout{*}
           \typeout{* Your version of the natbib package might be too}
           \typeout{* old to be usable. This class was designed to}
           \typeout{* work with the version 7.0 dated 1999/05/28}
           \typeout{*}
           \typeout{* If problems occur download a}
           \typeout{* recent version from a CTAN host.}
           \typeout{*}
           \typeout{* Refer to http://www.ctan.org and search for "natbib".}
           \typeout{*}
           \typein{* Type <return> to continue ...}

           \global\problemtrue
	  }
        \endgroup
        }{}
    }
    {
     \typeout{* ... not found! }
     \typeout{*}
     \typeout{* Serious problem detected:}
     \typeout{*}
     \typeout{* The natbib package, which should be part of a good LaTeX}
     \typeout{* distribution, can not be found.}
     \typeout{*}
     \typeout{* Without this package you will not be able to use certain}
     \typeout{* citation styles. See the aipguide documentation!}
     \typeout{*}
     \typeout{* Especially the layout for ARLO requires this package!}
     \typeout{*}
     \typeout{* Try to download this package from a CTAN  host.}
     \typeout{* Refer to http://www.ctan.org and search for "natbib".}
     \typeout{*}
     \typein{* Type <return> to continue ...}

     \problemtrue
    }

\makeatother


\typeout{*}
\typeout{* ... finished testing}
\typeout{*}
\ifproblem
\typeout{* The tests have revealed some problems in your TeX installation.}
\typeout{*}
\typeout{* Please review the above comments carefully and read the file}
\typeout{* README for further information.}
\typeout{*}
\typeout{*****************************************************************}
\typein{* Type <return> to continue ...}
\else
\typeout{****************************************************************}
\typeout{*}
\typeout{* The tests have reveiled no problems in your TeX installation.}
\typeout{*}
\typeout{****************************************************************}
\fi


% if this file is run standalone stop otherwise continue

\makeatletter
\IfStandaloneCheck
 {
\typeout{*}
\typeout{* This document only produces terminal output.}
\typeout{*}
\stop
 }
 {
\AtBeginDocument{\relax\ifx\xfm@address@loop\@undefined
  \typeout{***************************}
  \typeout{* Oooops ... you seem to have picked up an obsolete}
  \typeout{* aipproc.cls file from a previous installation!}
  \typeout{*}
  \typeout{* Please check that LaTeX finds the right one.}
  \typeout{*}
  \typeout{* Sorry have to give up ....}
  \typeout{***************************}
  \stop
 \fi}
 }
\makeatother

\endinput

kamoleproc.tex
%                   kamoleproc.tex
%
%
%%
%% This is file `template-6s.tex',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% template.raw  (with options: `6s')
%% 
%% Template for the LaTeX class aipproc.
%% 
%% (C) 1998,2000,2001 American Institute of Physics and Frank Mittelbach
%% All rights reserved
%% 
%%
%% $Id: template.raw,v 1.8 2002/06/02 15:34:15 frank Exp $
%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Please remove the next line of code if you
%% are satisfied that your installation is
%% complete and working.
%%
%% It is only there to help you in detecting
%% potential problems.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\input{aipcheck}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% SELECT THE LAYOUT
%%
%% The class supports further options.
%% See aipguide.pdf for details.
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\documentclass[
    ,final            % use final for the camera ready runs
%%  ,draft            % use draft while you are working on the paper
%%  ,numberedheadings % uncomment this option for numbered sections
%%  ,                 % add further options here if necessary
  ]
  {aipproc}

\layoutstyle{6x9}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% FRONTMATTER
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\usepackage{epsfig}


\begin{document}

\title{Hard core attraction in hadron scattering and 
the family of the Ds meson molecule}
\author{Pedro Bicudo}{address={
Dep. F\'{\i}sica and CFIF, Instituto Superior T\'ecnico, Av.
Rovisco Pais
1049-001 Lisboa, Portugal}}
\author{Gon\c{c}alo M. Marques}{address={
Dep. F\'{\i}sica and CFIF, Instituto Superior T\'ecnico, Av.
Rovisco Pais
1049-001 Lisboa, Portugal}}
%
%
\begin{abstract}
We study the discovered Ds(2317) at BABAR, CLEO and BELLE, and find that it 
belongs to a class of strange multiquarks, which is equivalent to the class of 
kaonic molecules bound by hard core attraction. In this class of hadrons a kaon 
is trapped by a s-wave meson or baryon.
To describe this class of multiquarks we apply the Resonating Group Method, and 
extract the hard core kaon-meson(baryon)interactions. We derive a criterion to classify 
the attractive channels. We find that the mesons f0(980), Ds(2457), Bs scalar and axial, and 
also the  baryons with the quantum numbers of $\Lambda, \Xi_c, \Xi_b$ and also 
$\Omega_{cc}, \Omega_{cb}$ and $\Omega_{bb}$ belong to the new hadronic class of the Ds(2317).
\end{abstract}
\maketitle


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                                                   %%
%%                                   SSS                             %%
%%                                  S   S                            %%
%%                                   S                               %%
%%                                    S                              %%
%%                                     S                             %%
%%                                  S   S                            %%
%%                                   SSS                             %%
%%                                                                   %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\par
Recently new narrow scalar resonances $D_s(2317)$ and $D_s(2457)$ were discovered 
at BABAR  
\cite{Babar}, 
CLEO
\cite{Cleo}
and BELLE
\cite{Belle}.
These positive parity resonances 
\cite{Rupp2}
were also predicted by Nowak, Ro and Zahed 
\cite{Nowak,Bardeen}
as chiral partners of the well known negative parity $D_s(1968)$ and $D_s(2112)$.
Here we find that the new $D_s$ resonances can be undesrtood as tetraquarks, 
or equivalently as $D$-$K$ molecules 
\cite{Tornqvist}
bound by the hardcore attraction.
These are not standard hadrons because they are neither quark-antiquark mesons nor three 
quark baryons. 
The experimental discovery of these hadrons also prompts us to study the 
new hadronic class which includes the $D_s(2317)$. 
In our framework the masses and couplings of hadrons are microscopically computed
at the quark level and in a chiral invariant framework,
\cite{Bicudo3,Bicudo1,Bicudo2}.

\par
In this talk we study the family of all possible narrow tetraquark 
and pentaquark resonances 
\cite{Jaffe}
where the quark $s$, or the Kaon play a crucial role. 
We start by reviewing the Resonating Group Method (RGM) 
\cite{Wheeler}. 
The RGM, together with chiral symmetry, produces hard core 
hadron-hadron potentials, which can be either repulsive or attractive. 
We derive a criterion to discriminate which systems
bind and which are unbound. We apply this criterion to find, among the s-wave 
hadrons, the candidates to trap a kaon. Finally we compute the binding energy
of the selected hadrons, the positive parity mesons $f_0(980),  
D_s^{(0+)}, \, D_s^{(1+)}, \, B_s^{(0+)}, \, B_s^{(1+)}$ and the
negative parity baryons $\Lambda(1405), \Xi_c^{(-)}, \Xi_b^{(-)}$ and also $\Omega_{cc}^{(-)}, \Omega_{cb}^{(-)}$
and $\Omega_{bb}^{(-)}$.

\par
The RGM computes the effective multiquark energy 
using the matrix elements of the microscopic quark-quark interactions. 
The multiquark state is decomposed in anti-symmetrized combinations 
of simpler colour singlets, the baryons and mesons. 
The RGM was first used in hadronic physics by Ribeiro 
\cite{Ribeiro} 
to show that in exotic
hadron-hadron scattering, the quark-quark potential together with
the Pauli repulsion of quarks produces a repulsive short range
interaction. For instance this explains the $N - N$ hard core
repulsion, preventing nuclear collapse. Deus and Ribeiro
\cite{Deus} 
used the same RGM to show that, in non-exotic
channels, the quark-antiquark annihilation could produce a short
core attraction. This is confirmed in several studies
\cite{Bicudo3,Bicudo1,Bicudo2,Ribeiro,Deus,Bicudo}.

\par
The energy of the multiquark is computed with the matrix elements
of the hamiltonian,
\begin{equation}
H=\sum_i T_i +\sum_{i<j} V_{ij} +\sum_{i \bar j} A_{i \bar j} \ ,
\end{equation}
which includes the quark(antiquark) kinetic energies, the 
quark(antiquark)-quark(antiquark) interaction proportional
to the colour dependent 
${ \vec \lambda_i \over 2} \cdot { \vec \lambda_j \over 2}$
, and the 
quark-antiquark annihilation. 
Once the internal energy of each cluster is accounted, 
and we also use the antisymmetry of the baryon wave-function,
the remaining energy of the meson-meson or baryon-meson system is 
computed with the overlap,
\begin{eqnarray}  
{\cal O}_{bar \, A \atop mes \, B}&=&
3 \langle \phi_B \, \phi_A | -( V_{14}+V_{15}+2V_{24}+2V_{25} )P_{14} 
\nonumber \\
&& +A_{15} | \phi_A \phi_B \rangle
\nonumber \\
{\cal O}_{mes \, A \atop mes \, B}&=&
\langle \phi_B \, \phi_A | (1+P_{AB})[ -( V_{13}+V_{23}+V_{14}+V_{24})
\nonumber \\
&& \times P_{13} + A_{23} + A_{14} ] | \phi_A \phi_B \rangle
\ ,
\label{overlap kernel} 
\end{eqnarray}
where we use an obvious notation (see Fig. \ref{RGM overlaps}).
The colour, spin and flavour contributions to the overlaps simply provide
an algebraic factor. The momentum (or space)
integrations, is estimate them with the
variational method to produce a geometrical overlap,
\begin{equation}
\sum_{sfc} \int_p \phi_A^\dagger \phi_B^\dagger H \phi_B \phi_A
\simeq M \sum_{sfc} \int_p \phi_A^\dagger \phi_B^\dagger \phi_B \phi_A \ ,
\label{variational}
\end{equation}
where $M$ is the sum of hadronic masses corresponding to the
Hamiltonian $H$. 
%
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%                                   %%
%%                FFFFFF             %%
%%                F                  %%
%%                FFF                %%
%%                F                  %%
%%                F                  %%
%%                                   %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{figure}[t]
\epsfig{file=figRGM.ps,width=8.5cm} \caption{We show examples of
RGM overlaps, in (a) the norm overlap for the meson-baryon
interaction, in (b) a kinetic overlap the meson-meson interaction,
in (c) an interaction overlap the meson-meson interaction, in (d)
the annihilation overlap for the meson-baryon interaction.}
\label{RGM overlaps}
\end{figure}
%
%

\par
When spontaneous chiral symmetry breaking is
included in the quark model 
\cite{Bicudo3,Bicudo4} 
the annihilation potential turns ou to be crucial 
\cite{Bicudo1,Bicudo2} 
to understand the low mass of the $\pi$. The annihilation potential
$A$ is also present in the $\pi$ Salpeter equation where it
cancels most of the kinetic energy and confining potential $2T+V$.
From the quark model with chiral symmetry breaking we get the sum
rules \cite{Bicudo3},
\begin{eqnarray}
\langle 2 T+V +A \rangle_{S=0} &=& M_\pi \simeq 0
\nonumber \\
\langle 2T+V \rangle_{S=0} &=& {2 \over 3} (2M_N-M_\Delta)
\nonumber \\
\Rightarrow \langle A \rangle_{S=0} &\simeq& - {2 \over 3} (2M_N-M_\Delta) 
\ .
\label{sum rules}
\end{eqnarray}
In eq. (\ref{sum rules}) 
the matrix elements are evaluated for s-wave and
spin 0 wave-functions of light quarks. Similar sum rules also
exist for spin 1 wave-functions, involving only the mass of the
$\Delta$ baryon. The annihilation potential
for the strange quark mass is smaller by a factor of $\sigma$ which is a 
power of the constituent quark mass ratio $M_{u,d} /M_s$. 
From eqs. (\ref{sum rules}) it is clear that the annihilation
potential provides an attractive (negative) overlap. 

\par
In what concerns the quark-quark(antiquark) potential,
in the present case of s-wave states, with a $S=0$ kaon, the 
only potential which may contribute is the hyperfine potential, 
proportional to 
${ \vec \lambda_i \over 2} \cdot { \vec \lambda_j \over 2}
\ \vec S_i  \cdot  \vec S_j $. 
We find that the total matrix element is a hyperfine splitting,
\begin{equation}
\langle P_{13}(V_{13}+V_{23}+V_{14}+V_{24})\rangle =4 {2 \over 3}(M_\Delta-M_N) 
\end{equation}
and it is repulsive (positive).



\par
These results are
independent of the particular quark model that we choose to
consider, providing it is chiral invariant.
We therefore arrive at the criterion 
\\
- {\em whenever the two interacting hadrons have
a common flavour, the repulsion is increased,
\\
- when the two interacting hadrons have a matching quark and antiquark the attraction 
is enhanced }.


\par
In this paper we are interested in the class of resonances which can be 
understood as a S=-1 kaon $s \bar u$ or $s \bar d$ trapped by a s-wave hadron. 
With our criterion we can exclude all hadrons with an antiquark $\bar u $ or $\bar d$ 
or with a quark $s$ 
because the exchange overlap $\langle P_{13}\rangle$ would be allowed, and this
certainly contributes to repulsion. We assume that the attraction is
not sufficient to overcome this repulsion. In what concerns attraction
we need a quark $u$ or $d$ in the s-wave partner of the kaon, in order
to produce annihilation. 
This excludes the mesons $\eta, \, \eta' \, \omega, \, \phi$. 
Moreover we specialize in systems which are possible to study experimentally,
where the kaon partner is a hadronic resonance with a very narrow width.
This restricts the kaon partner to s-wave mesons and baryons,
and excludes wider resonances like the meson $\rho$ and the baryon $\Delta$.
The pion is also excluded because it is too light to bind to the kaon , all 
that we can get is a very broad resonance, the kappa resonance \cite{Rupp1}. 
Therefore the hadrons which are best candidates to strongly bind the Kaons
$s \bar l$ are the s-wave hadrons with flavour 
$l\bar s , \, l \bar c, \, l \bar b, \, lll, \, llc, \, llb , \, lcc, \, lcb, \, lbb$. 
This is expected to result in the $f_0(980)$ 
\cite{Rupp1}, 
the $D_s(2320$ 
\cite{Rupp2} 
the $D_s(2463)$
\cite{Babar}, 
the $\Lambda(1405)$ and several other predicted resonances. 


\par
A convenient basis for the meson and baryon wave-functions is the 
harmonic oscillator basis, parametrized by the inverse radius $\alpha$. We summarize
\cite{Bicudo1,Bicudo2,Bicudo} the effective potentials computed
for the different channels,
\begin{eqnarray}
V_{K-K}&=& 2 (1+\sigma)^2{1\over 6} \langle A \rangle \,  |\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha| \ ,
\nonumber \\
V_{K-D,D^*,B,B^*}&=& 2 {1 \over 6} \langle A \rangle \, |\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha| \ , 
\nonumber \\
V_{K-N}&=& 4 {1 \over 6} \langle A \rangle \, |\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha| \ ,
\nonumber \\
V_{K-\Sigma_c,\Sigma_b}&=& 
{7 \over 3} {1 \over 6} \langle A \rangle \, |\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha| \ ,
\nonumber \\
V_{K-\Xi_{cc},\Xi_{cb},\Xi_{bb}}&=& 2 {1 \over 6} \langle A \rangle \, 
|\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha| \ , 
\label{zero p}
\end{eqnarray}
where the colour and spin factors contribute respectively with $1/3$ and $1/2$, 
$\langle A \rangle$ is of the order of 430 MeV and the geometrical factor provides
the separable potential $|\phi_{000}^\alpha \rangle \langle \phi_{000}^\alpha|$ .
The remaining factor is the flavour factor, the only one that turns out to 
differ in the s-wave kaon-hadron annihilation. The parameter $\alpha$ is
are the only model one, and from the $D_s(2320)$ channel we $\alpha$=285 MeV. 

\par
This parametrization hard core interaction in a separable potential,
enables us to use standard techniques
\cite{Bicudo} 
to exactly compute the scattering $T$ matrix.
The binding occurs when the $T$ matrix has a pole for
a negative relative energy, and this happens when,
\begin{equation}
- 4 \mu v \ge { \alpha^3 \over \beta } \ .
\end{equation}


\par
The results are displayed in Tables \ref{binding energies} and \ref{excessive binding}. 
We conclude that the
$f_0(980$ and the $D_s^{(0+)}, \, D_s^{(1+)}, \, B_s^{(0+)}, \, B_s^{(1+)}$
belong to the same class of tetraquark hadronic resonances. This
class is consistent with the picture of a kaon trapped by a
s-wave meson. In what concerns pentaquarks, where the kaon is
trapped for instance by a nucleon to produce a $\Lambda$, or by
other hadrons with u or d light quarks, our 
results predict that we have also have binding with the quantum
numbers of the $\Lambda$ and $\Xi_c^+$, $\Xi_c^0$, $\Xi_b^0$, $\Xi_b^-$
and also of the $\Omega_{cc}$, $\Omega_{cb}$, and $\Omega_{bb}$. 

\par
Here we neglected the coupling to the pion-hadron channels. This is correct
for the multiquarks of Table \ref{binding energies} where this coupling is
isospin violating. However in the systems of Table \ref{excessive binding}, 
where we found a deep binding, we plan to include the coupling to the 
pion-hadron channels. This coupling is expected to decrease substantially the
binding energy. We also expect that our method addresses the 
protonomium recently discovered at BES
\cite{BES} 
and the deuson X(3872) recently discovered at BELLE
\cite{BELLE2}. 


\begin{theacknowledgments}
We are very grateful to Emilio Ribeiro for discussions on the
RGM and to George Rupp for discussions on
hadronic resonances. 
The work of G. Marques is supported by Funda\c c\~ao para a
Ci\^encia e a Tecnologia under the grant SFRH/BD/984/2000.
%
%
%%%%%%%%%%%%%%%%%%%%%%%
%                     %
%       TTTTTTT       %
%          T          %
%          T          %
%          T          %
%          T          %
%                     %
%%%%%%%%%%%%%%%%%%%%%%%
\begin{table}[t]
\begin{tabular}{c|cccccc}
channel                   
& $\mu_{exp}$  & $v_{th}$&$\alpha=\beta$& $B_{th}$& $B_{exp}$ \\
\hline 
$ D_s(2317)= {K^- {\bar D}^0+{\bar K}^0 D^- \over \sqrt{2}  }   $ 
& 392 & -143 &  {\em 285 } &  {\em 46}& 46
 \\
$  D_s(2457)= {K^- {\bar D}^{*0}+{\bar K}^0 D^{*-} \over \sqrt{2} }    $ 
& 398 & -143 &  285 & 47 & 46
 \\
$  K^- {\bar B}^0+{\bar K}^0 B^- \over \sqrt{2}     $ 
& 453 & -143 &  285 &  55 & -
 \\
$ K^- {\bar B}^{*0}+{\bar K}^0 B^{*-} \over \sqrt{2}     $ 
& 454 & -143 &  285 & 55 & -
 \\
$  { K^- \Xi^{++}_{cc} + {\bar K}^0 \Xi^+_{cc} \over \sqrt{2}  }    $ 
& 442 & -143 &  285 & 53 & -
 \\
$  { K^- \Xi^{+}_{cb}  + {\bar K}^0 \Xi^{0}_{cb} \over \sqrt{2}  }    $ 
& 466 & -143 &  285 & 56 & -
 \\
$  { K^- \Xi^{0}_{bb}  + {\bar K}^0 \Xi^{-}_{bb} \over \sqrt{2}  }    $ 
& 475 & -143 &  285 & 58 & -
 \\
\hline
\end{tabular}
\caption{ This table summarizes the parameters $\mu , \, v \,
,\alpha \, , \beta$ 
 and binding energies $B$  (in MeV).
The italic binding energy $B_{th}$  of the $D_s(1327)$ is fitted from experiment}
\label{binding energies}
\end{table}
%
%
%
%
%
%%%%%%%%%%%%%%%%%%%%%%%
%                     %
%       TTTTTTT       %
%          T          %
%          T          %
%          T          %
%          T          %
%                     %
%%%%%%%%%%%%%%%%%%%%%%%
\begin{table}[t]
\begin{tabular}{c|cccccc}
channel                   
& $\mu_{exp}$  & $v_{th}$&$\alpha=\beta$& $B_{th}$& $B_{exp}$ \\
\hline 
$ f_0(980)= {K^- K^+ + {\bar K}^0 K^0 \over \sqrt{2} } $ 
& 248 & -207&  285 & 59 & 12 $\pm$ 10
\\
$ \Lambda(1405)= { K^- p + {\bar K}^0 n\over \sqrt{2}  }    $ 
& 325 & -286 &  285 & 149 & 30 $\pm$ 4 
 \\
$  { K^- \Sigma^{++}_c + {\bar K}^0 \Sigma^{+}_c \over \sqrt{2}  }    $ 
& 412 & -167 &  285 & 68 & -
 \\
$  { K^- \Sigma^{+}_b + {\bar K}^0 \Sigma^{0}_b \over \sqrt{2}  }    $ 
& 456 & -167 &  285 & 75 & -
 \\
\hline
\end{tabular}
\caption{ 
Results for channels open to pion decay.
}
\label{excessive binding}
\end{table}
%
%
%

\end{theacknowledgments}


%bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
%bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
%bb
%bb
%bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
%bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

\begin{thebibliography}{00}
%
\bibitem{Babar}
B.~Aubert {\it et al.} [BABAR Collaboration],
%``Observation of a narrow meson decaying to D/s+ pi0 at a mass of 2.32-GeV/c**2,''
Phys.\ Rev.\ Lett.\ {\bf 90}, 242001 (2003) [arXiv:hep-ex/0304021].
%%CITATION = HEP-EX 0304021;%%
%
\bibitem{Cleo}
D.~Besson {\it et al.}  [CLEO Collaboration],
%``Observation of a narrow resonance of mass 2.46-GeV/c**2 decaying to  D/s*+ pi0 
% and confirmation of the D/sJ*(2317) state,''
Phys.\ Rev.\ D {\bf 68}, 032002 (2003)
[arXiv:hep-ex/0305100].
%%CITATION = HEP-EX 0305100;%%
%
\bibitem{Belle}
P.~Krokovny {\it et al.}  [Belle Collaboration],
%``Observation of the D/sJ(2317) and D/sJ(2457) in B decays,''
arXiv:hep-ex/0308019.
%%CITATION = HEP-EX 0308019;%%
%
\bibitem{Rupp2}
G. Rupp and E. van Beveren,  Phys.Rev.Lett. {\bf 91}, 012003(2003)
 [arXiv:hep-ph/0305035].
%
\bibitem{Nowak}
M.A. Nowak, M. Rho and I. Zahed, Phys. Rev. D{\bf48}, 4370 (1993) hep-ph/9209272.
%
\bibitem{Bardeen}
W.A. Bardeen and C. T. Hill, Phys. Rev. D{\bf 49}, 409 (1994) hep-ph/9304265.
%
\bibitem{Tornqvist}
N. Tornqvist, Phys.\ Rev.\ Lett.\  {\bf 67}, 556 (1991).
%%CITATION = PRLTA,67,556;%%%
%
\bibitem{Bicudo3}
P.~J.~Bicudo and J.~E.~Ribeiro,
%``Current Quark Model In A P Wave Triplet Condensed Vacuum. 1.
%The Dynamical Breaking Of Chiral Symmetry,''
Phys.\ Rev.\ D {\bf 42}, 1611 (1990); %%CITATION = PHRVA,D42,1611;%%
1625 (1990); %%CITATION = PHRVA,D42,1625;%%
1635 (1990). %%CITATION = PHRVA,D42,1635;%%
%
\bibitem{Bicudo1}
P.~Bicudo, S.~Cotanch, F.~Llanes-Estrada, P.~Maris, E.~Ribeiro and
A.~Szczepaniak,
%``Chirally symmetric quark description of low energy pi pi scattering,''
Phys.\ Rev.\ D {\bf 65}, 076008 (2002) [arXiv:hep-ph/0112015];
%%CITATION = HEP-PH 0112015;%%
P.~Bicudo, %``Analytic proof that the quark model complies with partially
%conserved axial current theorems,''
Phys.\ Rev.\ C {\bf 67}, 035201 (2003). %%CITATION = PHRVA,C67,035201;%%
%
\bibitem{Bicudo2}
P.~Bicudo, M.~Faria, G.~M.~Marques and J.~E.~Ribeiro,
%``Microscopic derivation of N (Delta) pi scattering lengths,''
arXiv:nucl-th/0106071. %%CITATION = NUCL-TH 0106071;%%
%
\bibitem{Jaffe}
R.~L.~Jaffe,
%``Multi - Quark Hadrons. 2. Methods,''
Phys.\ Rev.\ D {\bf 15} 281 (1977);
%%CITATION = PHRVA,D15,281;%%
%
D.~Strottman,
%``Multi - Quark Baryons And The Mit Bag Model,''
Phys.\ Rev.\ D {\bf 20} 748 (1979).
%%CITATION = PHRVA,D20,748;%%
%
\bibitem{Wheeler}
J.~Wheeler, Phys.\ Rev.\ {\bf 52}, 1083 (1937); {\bf 52}, 1107
(1937).
%
\bibitem{Ribeiro}
J.~E.~Ribeiro, Z.\ Phys.\ C {\bf 5}, 27 (1980).
%%CITATION = ZEPYA,C5,27;%%
%
\bibitem{Deus}
J.~Dias de Deus and J.~Ribeiro Phys.\ Rev.\ D {\bf 21}, 1251
(1980).
%
\bibitem{Bicudo}
P.~Bicudo and J.~E.~Ribeiro,
%``K - N Exotic S Channel I = 1, 0 Phase Shifts: A Test Of The
% Nonannihilating Quark Quark Potential,''
Z.\ Phys.\ C {\bf 38}, 453 (1988); %%CITATION = ZEPYA,C38,453;%%
P.~Bicudo, J.~E.~Ribeiro and J.~Rodrigues,
%``K - N S Channel I = 1, 0 Phase Shifts As A Direct Measure Of
%Chiral Condensation,''
Phys.\ Rev.\ C {\bf 52}, 2144 (1995). %%CITATION = PHRVA,C52,2144;%%%
%
\bibitem{Bicudo4}
P.~J.~Bicudo,
%``New Perspective On The Scalar Meson Puzzle, From
%Spontaneous Chiral Symmetry Breaking Beyond Bcs,''
Phys.\ Rev.\ C {\bf 60}, 035209 (1999). %%CITATION = PHRVA,C60,035209;%%
%
\bibitem{Rupp1}
E. van Beveren {\it et al.},  
% C. Dullemond, C. Metzger, E. Ribeiro, T.A. Rijken, and G. Rupp,
%A low-lying scalar-meson nonet in a unitarized meson model,
Z. Phys. C 30, 615 (1986).
%
\bibitem{BES}
J.~Z.~Bai {\it et al.}  [BES Collaboration],
%``Observation of a near-threshold enhancement in the p anti-p mass  spectrum from radiative J/psi $\to$ gamma p anti-p decays,''
Phys.\ Rev.\ Lett.\  {\bf 91}, 022001 (2003)
[arXiv:hep-ex/0303006].
%%CITATION = HEP-EX 0303006;%%
%
\bibitem{BELLE2}
K.~Abe {\it et al.}  [Belle Collaboration],
%``Observation of a new narrow charmonium state in exclusive B+ $\to$ K+ pi+ pi- J/psi decays,''
arXiv:hep-ex/0308029.
%%CITATION = HEP-EX 0308029;%%
%
\end{thebibliography}

\end{document}

%eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
%eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
%ee                                                         ee
%ee                                                         ee
%ee                                                         ee
%ee                                                         ee
%ee                                                         ee
%ee                                                         ee
%ee                                                         ee
%eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
%eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee


hep-ph0310008.extracted_bib
\begin{thebibliography}{00}
%
\bibitem{Babar}
B.~Aubert {\it et al.} [BABAR Collaboration],
%``Observation of a narrow meson decaying to D/s+ pi0 at a mass of 2.32-GeV/c**2,''
Phys.\ Rev.\ Lett.\ {\bf 90}, 242001 (2003) [arXiv:hep-ex/0304021].
%%CITATION = HEP-EX 0304021;%%
%
\bibitem{Cleo}
D.~Besson {\it et al.}  [CLEO Collaboration],
%``Observation of a narrow resonance of mass 2.46-GeV/c**2 decaying to  D/s*+ pi0 
% and confirmation of the D/sJ*(2317) state,''
Phys.\ Rev.\ D {\bf 68}, 032002 (2003)
[arXiv:hep-ex/0305100].
%%CITATION = HEP-EX 0305100;%%
%
\bibitem{Belle}
P.~Krokovny {\it et al.}  [Belle Collaboration],
%``Observation of the D/sJ(2317) and D/sJ(2457) in B decays,''
arXiv:hep-ex/0308019.
%%CITATION = HEP-EX 0308019;%%
%
\bibitem{Rupp2}
G. Rupp and E. van Beveren,  Phys.Rev.Lett. {\bf 91}, 012003(2003)
 [arXiv:hep-ph/0305035].
%
\bibitem{Nowak}
M.A. Nowak, M. Rho and I. Zahed, Phys. Rev. D{\bf48}, 4370 (1993) hep-ph/9209272.
%
\bibitem{Bardeen}
W.A. Bardeen and C. T. Hill, Phys. Rev. D{\bf 49}, 409 (1994) hep-ph/9304265.
%
\bibitem{Tornqvist}
N. Tornqvist, Phys.\ Rev.\ Lett.\  {\bf 67}, 556 (1991).
%%CITATION = PRLTA,67,556;%%%
%
\bibitem{Bicudo3}
P.~J.~Bicudo and J.~E.~Ribeiro,
%``Current Quark Model In A P Wave Triplet Condensed Vacuum. 1.
%The Dynamical Breaking Of Chiral Symmetry,''
Phys.\ Rev.\ D {\bf 42}, 1611 (1990); %%CITATION = PHRVA,D42,1611;%%
1625 (1990); %%CITATION = PHRVA,D42,1625;%%
1635 (1990). %%CITATION = PHRVA,D42,1635;%%
%
\bibitem{Bicudo1}
P.~Bicudo, S.~Cotanch, F.~Llanes-Estrada, P.~Maris, E.~Ribeiro and
A.~Szczepaniak,
%``Chirally symmetric quark description of low energy pi pi scattering,''
Phys.\ Rev.\ D {\bf 65}, 076008 (2002) [arXiv:hep-ph/0112015];
%%CITATION = HEP-PH 0112015;%%
P.~Bicudo, %``Analytic proof that the quark model complies with partially
%conserved axial current theorems,''
Phys.\ Rev.\ C {\bf 67}, 035201 (2003). %%CITATION = PHRVA,C67,035201;%%
%
\bibitem{Bicudo2}
P.~Bicudo, M.~Faria, G.~M.~Marques and J.~E.~Ribeiro,
%``Microscopic derivation of N (Delta) pi scattering lengths,''
arXiv:nucl-th/0106071. %%CITATION = NUCL-TH 0106071;%%
%
\bibitem{Jaffe}
R.~L.~Jaffe,
%``Multi - Quark Hadrons. 2. Methods,''
Phys.\ Rev.\ D {\bf 15} 281 (1977);
%%CITATION = PHRVA,D15,281;%%
%
D.~Strottman,
%``Multi - Quark Baryons And The Mit Bag Model,''
Phys.\ Rev.\ D {\bf 20} 748 (1979).
%%CITATION = PHRVA,D20,748;%%
%
\bibitem{Wheeler}
J.~Wheeler, Phys.\ Rev.\ {\bf 52}, 1083 (1937); {\bf 52}, 1107
(1937).
%
\bibitem{Ribeiro}
J.~E.~Ribeiro, Z.\ Phys.\ C {\bf 5}, 27 (1980).
%%CITATION = ZEPYA,C5,27;%%
%
\bibitem{Deus}
J.~Dias de Deus and J.~Ribeiro Phys.\ Rev.\ D {\bf 21}, 1251
(1980).
%
\bibitem{Bicudo}
P.~Bicudo and J.~E.~Ribeiro,
%``K - N Exotic S Channel I = 1, 0 Phase Shifts: A Test Of The
% Nonannihilating Quark Quark Potential,''
Z.\ Phys.\ C {\bf 38}, 453 (1988); %%CITATION = ZEPYA,C38,453;%%
P.~Bicudo, J.~E.~Ribeiro and J.~Rodrigues,
%``K - N S Channel I = 1, 0 Phase Shifts As A Direct Measure Of
%Chiral Condensation,''
Phys.\ Rev.\ C {\bf 52}, 2144 (1995). %%CITATION = PHRVA,C52,2144;%%%
%
\bibitem{Bicudo4}
P.~J.~Bicudo,
%``New Perspective On The Scalar Meson Puzzle, From
%Spontaneous Chiral Symmetry Breaking Beyond Bcs,''
Phys.\ Rev.\ C {\bf 60}, 035209 (1999). %%CITATION = PHRVA,C60,035209;%%
%
\bibitem{Rupp1}
E. van Beveren {\it et al.},  
% C. Dullemond, C. Metzger, E. Ribeiro, T.A. Rijken, and G. Rupp,
%A low-lying scalar-meson nonet in a unitarized meson model,
Z. Phys. C 30, 615 (1986).
%
\bibitem{BES}
J.~Z.~Bai {\it et al.}  [BES Collaboration],
%``Observation of a near-threshold enhancement in the p anti-p mass  spectrum from radiative J/psi $\to$ gamma p anti-p decays,''
Phys.\ Rev.\ Lett.\  {\bf 91}, 022001 (2003)
[arXiv:hep-ex/0303006].
%%CITATION = HEP-EX 0303006;%%
%
\bibitem{BELLE2}
K.~Abe {\it et al.}  [Belle Collaboration],
%``Observation of a new narrow charmonium state in exclusive B+ $\to$ K+ pi+ pi- J/psi decays,''
arXiv:hep-ex/0308029.
%%CITATION = HEP-EX 0308029;%%
%
\end{thebibliography}