M.Broilo, D.A.Fagundes, E.G.S.Luna, M.J.Menon

Physics Letters B

10/12/2019

Abstract

Recently the TOTEM experiment at the LHC has released measurements at TeV of the proton-proton total cross section, , and the ratio of the real to imaginary parts of the forward elastic amplitude, ρ. Since then an intense debate on the C-parity asymptotic nature of the scattering amplitude was initiated. We examine the proton-proton and the antiproton-proton forward data above 10 GeV in the context of an eikonal QCD-based model, where nonperturbative effects are readily included via a QCD effective charge. We show that, despite an overall satisfactory description of the forward data is obtained by a model in which the scattering amplitude is dominated by only crossing-even elastic terms, there is evidence that the introduction of a crossing-odd term may improve the agreement with the measurements of ρ at TeV. In the Regge language the dominant even(odd)-under-crossing object is the so called Pomeron (Odderon).

10.1016/j.physletb.2019.135047