High energy elastic pp differential cross section at LHC at the c.m. energy 14 TeV is predicted using the asymptotic behavior of σ_(tot)(s) and ρ(s), and the measured (p-bar)p differential cross section at (1/2)~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.
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