First Measurement Of The Jet Cross Section In Polarized p+p Collisions At $\sqrt{s}=200 $ GeV
Michael L. Miller (for the STAR Collaboration)
We present preliminary measurements of the inclusive jet cross section in the transverse momentum region 5<$p_{T}$<50 GeV/c from 0.2 $pb^{-1}$ of polarized p+p data at $\sqrt{s}$=200 GeV.%using %theSTAR detector at RHIC. %Final state hadron energies were measured %using charged particle tracking in the time projection chamber and %energy deposition in the electromagnetic calorimeter. Hadrons were %clustered using the midpoint-cone algorithm, and the data were The data were corrected for detector inefficiency and resolution using PYTHIA events processed through a full GEANT simulation. The measured jet cross section agrees well with NLO pQCD calculations over seven orders of magnitude. These "proof of principal" measurements pave the way for ongoing analyses of the higher statistics ($\sim$ 3 $pb^{-1}$) data sample from the 2005 RHIC run.
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    
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       \ifx\rmdefault\next
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         \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,}
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\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}
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      \typeout{*}
      \typein{* Type <return> to continue ...}
      \problemtrue
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      \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}
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	  \typeout{*}
	  \typeout{* You can use the aipproc class without this package but }
	  \typeout{* you have to specify the option "mathptm" (no x) so that}
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	  \typeout{*}
	  \typein{* Type <return> to continue ...}
	  \problemtrue
	  \gdef\psnfssproblemoption{mathptm,}
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       }
       {
	\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}
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miller_panic05.tex
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\begin{document}

\title{First Measurement Of The Jet Cross Section In Polarized p+p Collisions At $\sqrt{s}=200 $ GeV}

\classification{13.87.-a}
%
\keywords      {jet, RHIC, Quantum Chromodynamics, cross section,
parton distribution function}

\author{Michael L. Miller (for the STAR Collaboration)}{
  address={Massachusetts Institute of Technology, Department of Physics,  77 Massachusetts Avenue, Cambridge, MA  02139 }
}

%
%

\begin{abstract}
We present preliminary measurements of the inclusive jet cross
section in the transverse momentum region 5<$p_{T}$<50
GeV/\textit{c} from
0.2 $pb^{-1}$ of polarized p+p data at $\sqrt{s}$=200 GeV.%using
%theSTAR detector at RHIC.
%Final state hadron energies were measured
%using charged particle tracking in the time projection chamber and
%energy deposition in the electromagnetic calorimeter.  Hadrons were
%clustered using the midpoint-cone algorithm, and the data were
The data were corrected for detector inefficiency and resolution
using PYTHIA events processed through a full GEANT simulation.  The
measured jet cross section agrees well with NLO pQCD calculations
over seven orders of magnitude.  These "proof of principal"
measurements pave the way for ongoing analyses of the higher
statistics ($\sim$ 3 $pb^{-1}$) data sample from the 2005 RHIC run.
\end{abstract}

\maketitle

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% MAINMATTER
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%\section{Introduction}
The relativistic heavy ion collider (RHIC) is the first high energy
polarized proton-proton collider.  Of the two large detectors, the
solenoidal tracker at RHIC (STAR) is uniquely capable of full jet
reconstruction in p+p collisions.  STAR is just embarking on a rich
and diverse set of jet measurements in p+p collisions.  The
calibration of the jet energy scale and transverse energy resolution
are critical to many physics analyses including, but not limited to,
constraint of the gluon polarization via measurement of jet
production in polarized p+p collisions \cite{joanna}.  Future high
statistics measurement of unpolarized jet cross sections at RHIC may
provide significant constraints to previously measured large-x
parton distribution functions (PDFs), which could impact searches
for new physics at both the Tevatron and the LHC \cite{pumplin}.  We
present a preliminary measurement of the inclusive jet cross section
for 5<$p_T<$50 GeV/$c$. The measurement, primarily limited by
systematic uncertainties, agrees reasonably well with a NLO pQCD
calculation.

%\section{Data Collection}

The data were collected during a short 2004 p+p commissioning run at
200 GeV.  STAR, a large acceptance collider detector with precision
tracking and electromagnetic calorimetry, is described in detail
elsewhere \cite{STAR-nim}.  An array of scintillating beam-beam
counters (BBC) spanning pseudorapidity 3.3<|$\eta$|<5 were used to
trigger on non-singly diffractive (NSD) inelastic collisions.  The
BBCs were sensitive to 26.1$\pm$2.0 mb (87\%) of the NSD cross
section \cite{Gans}. The detector subsystems of principle interest
to this analysis were the large acceptance time projection chamber
(TPC) and the partially commissioned (2400 of 4800 towers) barrel
electromagnetic calorimeter (BEMC).  Both have full azimuthal
coverage, and the TPC (BEMC) covers $| \eta |$<1.2 (0<$\eta$<1). The
BEMC was calibrated \textit{in situ} using the high statistics data
from the immediately preceding Au run. The relative gain of the BEMC
was established by studying hadronic energy deposition of charged
tracks, and the overall energy scale was set using well contained
showers from 1.5<$p$<8 GeV/\textit{c} electrons selected in the TPC.
The data presented here were collected in two trigger
configurations: minimum bias (MB) and high tower (HT). The highly
pre-scaled MB trigger required a BBC coincidence between positive
and negative $\eta$ in time with a valid bunch crossing. The HT
trigger required the MB condition as well as a single tower above an
$E_{T}$ threshold corresponding to $\sim$2.5 ($\sim$3.0) GeV at
$\eta_{tower}$ of 0 (1). This trigger was efficient for energetic
$\gamma$, $\pi^{0}$ and $e$ candidates. It also significantly
enhanced the population of high $p_T$ jets, but with strong
energy-dependant efficiency.  In this analysis we attempt to correct
for this jet-$p_T$ dependent trigger efficiency using simulation.
The produced 2004 event sample consisted of $\sim$4.2M events before
cuts, corresponding to a sampled luminosity of $\sim$0.16 $pb^{-1}$.

%\section{Data Analysis}

To preserve a large (80-90\%) and uniform tracking efficiency,
events with a primary vertex within z=$\pm$60 cm of the center of
STAR were analyzed.  Additionally, a requirement of
$E_{T}^{trig-tower}$>3.5 GeV was imposed on HT events to ensure
uniform trigger efficiency across all BEMC towers.  We analyzed
charged particles with $p_{T}$>0.2 GeV/\textit{c} originating within
a 3 cm sphere of the reconstructed primary interaction point. Tower
energies were corrected for hadronic energy deposition. Towers with
corrected $E_{T}$<0.2 GeV/\textit{c} were discarded from the
analysis. Jet finding was performed using the midpoint-cone
algorithm \cite{blazey}. For each event, a list of four momenta was
constructed from TPC tracks and BEMC towers.  For tracks (towers)
the $\pi^+$ ($\gamma$) mass was assumed.  The algorithm parameters
used were $r_{cone}$=0.4, $p_{T}^{seed}$=0.5 GeV/\textit{c}, and
$f_{merge}^{split}$=0.5. However, it should be noted that the HT
trigger requirement introduced an effective seed threshold of 3.5
GeV. Reconstructed jets were reported for $p_{T}$>5 GeV/\textit{c}
and were restricted to 0.2<$\eta$<0.8 to minimize edge effects in
the BEMC. Fake "neutral energy" jets originating from accelerator
backgrounds were discarded \cite{joanna}. After all cuts
approximately 10k (55k) jets remained from the MB (HT) sample. We
attempt to correct the measured jet yield to the particle level,
i.e. the energy of the $r_{cone}$=0.4 cluster immediately after
hadronization but before any detector effects.  %We do not attempt
%the model dependent correction to the original parton level.
Detector efficiency and finite resolution were evaluated by studying
PYTHIA (v6.205) \cite{pythia} events passed through the STAR
simulation and reconstruction software.  The "true" properties of
jets were defined by running the same clustering algorithm on the
final state PYTHIA event record. The "accepted" properties of jets
were defined by clustering the simulated track and tower output of
the full simulation/reconstruction chain.  The jet $p_T$ resolution
was found to be 25\%, which motivated the final choice of binning.
We define a "generalized efficiency" via the bin-by-bin correction
factor $c(p_T) =
\frac{M^{acc}(p_{T}^{acc})}{N^{true}(p_{T}^{true})}$
%
%\begin{equation}
%c(p_T) = \frac{M^{geant}(p_{T}^{geant})}{N^{pythia}(p_{T}^{pythia})}
%
%\label{ionflux}
%\end{equation}
that convolutes effects from jet reconstruction efficiency,
resolution induced bin sharing, and trigger efficiency. The
correction factor is evaluated separately for MB and HT modes, where
the Monte Carlo events are subject to the same trigger requirements
as the data.  Note that bin-migration can yield $c>1$.

%\section{Results and discussion}
Figure 1a shows the correction factor for MB and HT data.  Whereas
the MB correction is $\approx 1\pm0.1$, the HT correction varies by
two orders of magnitude.  The primary difference between the MB and
HT corrections is the inclusion of the HT trigger efficiency, which
varies strongly with jet-$p_T$ due to the weak correlation between
$p_T$ of the trigger photon (via $\pi^0$ decay) and $p_T$ of the
parent jet. Figure 1b shows the corrected jet cross section. An
additional correction of $60\pm$2\% was applied to account for valid
MB events where no primary vertex was reconstructed.  The MB and HT
data show good agreement in the three overlapping bins, where the MB
and HT efficiencies differ by two orders of magnitude.  The data are
compared to results from a fast (small-cone approximation) NLO pQCD
calculation incorporating CTEQ6M PDFs and $r_{cone}$=0.4, with a
scale of $\mu_F~=~\mu_R~=~p_T$ \cite{werner}.  It was verified that
the calculation agrees with the standard EKS NLO calculation
\cite{eks} to better than 1\%. The calculations were performed with
the same binning as the data and both data and calculation are
plotted in the middle of the bins. We
\begin{tabular}{p{7cm}c}
  \textbf{Figure 1:} \begin{small}(a) The correction factor for MB and HT data
  derived from simulation.  Statistical errors are shown.  (b)
  Preliminary inclusive jet cross section compared to NLO pQCD
  calculation.  Statistical uncertainties are plotted but are
  smaller than the markers.  (c) Ratio comparison of data vs.
  theory.  The shaded band represents the dominant systematic
  uncertainty, and an 8\% uncertainty on the overall normalization is
  not shown.  See text for details. \end{small} &
  \raisebox{-7cm}{
  \includegraphics[clip=true, viewport=0.07in 0.in 6.6in 7.5in, height=.37\textheight]{figure1_2.eps}
  }
\end{tabular}
%
find good shape agreement over seven orders of magnitude.  Figure 1c
shows the ratio between data and theory.  The shaded band represents
the dominant systematic uncertainty (50\% change in yield) on the
measured cross section from the 10\% uncertainty on the jet energy
scale.  For $p_T>10$ GeV/c we find a systematic offset between data
and theory, but we conclude reasonable agreement within the large
systematic uncertainty.  Given the steeper slope of the jet cross
section at RHIC energies we expect the cross section measurement to
show increased sensitivity to uncertainties in the jet energy scale
when compared to the Tevatron.  A major challenge for future RHIC
runs will be the use of smaller cross section processes such as
di-jet and photon-jet final states to hopefully reduce the
uncertainty on the jet energy scale to below 5\%.

%\section{Conclusions}

We have presented preliminary measurement of the inclusive jet cross
section from 0.16 $pb^{-1}$ of polarized \textit{p+p} collisions at
$\sqrt{s}=200$ GeV.
% using both minimum bias and high tower triggers.
We correct for a high tower trigger efficiency that changes by two
orders of magnitude over the range of the measurement.
%We obtain
%good agreement between the two trigger sets in the modest region of
%overlap.
The reasonable agreement with NLO pQCD calculations over seven
orders of magnitude motivates the application of perturbative QCD to
interpret the spin dependent jet asymmetries recently reported from
STAR.  These measurements pave the way for ongoing analyses of
3$pb^{-1}$ of data already collected.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% BACKMATTER
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\begin{theacknowledgments}
%We thank the RHIC Operations Group and
%RCF at BNL, and the NERSC Center at LBNL for their support. This
%work was supported in part by the HENP Divisions of the Office of
%Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3,
%RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of
%Brazil; the Russian Ministry of Science and Technology; the Ministry
%of Education and the NNSFC of China; IRP and GA of the Czech
%Republic, FOM of the Netherlands, DAE, DST, and CSIR of the
%Government of India; Swiss NSF; the Polish State Committee for
%Scientific Research; STAA of Slovakia, and the Korea Sci. \& Eng.
%Foundation.

%\end{theacknowledgments}

\bibliographystyle{aipproc}   % if natbib is available
%\bibliographystyle{aipprocl} % if natbib is missing

\vspace{-0.25in}
\begin{thebibliography}{9}
\vspace{-0.15in}
\bibitem{joanna}
J. Kiryluk, these proceedings.

\bibitem{pumplin}
J. Pumplin, 13th International Workshop on Deep Inelastic Scattering
(2005) hep-ph/0507093.

\bibitem{STAR-nim}
K.H. Ackerman \textit{et al.}, Nucl. Instrum. Methods Phys. Res.,
Sect. A 499 (2003) 624.

\bibitem{Gans}
J. Adams \textit{et al.}, Phys. Rev. Lett. 91 (2003) 172302.

\bibitem{blazey}
Gerald C. Blazey \textit{et al.}, arXiv:hep-ex/0005012

\bibitem{pythia}
T. Sjostrand, P. Eden, C. Friberg \textit{et al.}, Comput. Phys.
Commun. 135 (2001) 238.

\bibitem{werner}
B. Jager, M. Stratmann, W. Vogelsang, Phys. Rev.D 70 (2004) 034010.

\bibitem{eks}
S. D. Ellis, Z. Kunszt, D. E. Soper, Phys.Rev.Lett.64 (1990) 2121.

\end{thebibliography}

\end{document}

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hep-ex0604001.extracted_bib
\begin{thebibliography}{9}
\vspace{-0.15in}
\bibitem{joanna}
J. Kiryluk, these proceedings.

\bibitem{pumplin}
J. Pumplin, 13th International Workshop on Deep Inelastic Scattering
(2005) hep-ph/0507093.

\bibitem{STAR-nim}
K.H. Ackerman \textit{et al.}, Nucl. Instrum. Methods Phys. Res.,
Sect. A 499 (2003) 624.

\bibitem{Gans}
J. Adams \textit{et al.}, Phys. Rev. Lett. 91 (2003) 172302.

\bibitem{blazey}
Gerald C. Blazey \textit{et al.}, arXiv:hep-ex/0005012

\bibitem{pythia}
T. Sjostrand, P. Eden, C. Friberg \textit{et al.}, Comput. Phys.
Commun. 135 (2001) 238.

\bibitem{werner}
B. Jager, M. Stratmann, W. Vogelsang, Phys. Rev.D 70 (2004) 034010.

\bibitem{eks}
S. D. Ellis, Z. Kunszt, D. E. Soper, Phys.Rev.Lett.64 (1990) 2121.

\end{thebibliography}