  High energy elastic pp differential cross section at LHC at the c.m. energy
14 TeV is predicted using the asymptotic behavior of sigma-tot(s) and rho(s),
and the measured pbar-p differential cross section at sqrt{s}=546 GeV. The
phenomenological investigation has progressively led to an effective field
theory model that describes the nucleon as a chiral bag embedded in a
quark-antiquark condensed ground state. The measurement of pp elastic
scattering at LHC up to large |t| >~ 10 GeV^2 by the TOTEM group will be
crucial to test this structure of the nucleon.
