Odderon in the light of collider low-$t$ data

TL;DR

This paper analyzes low-$t$ elastic scattering data from proton-proton and antiproton-proton collisions across a wide energy range to evaluate the potential contribution of the elusive Odderon, a $C$-odd amplitude, using a two-channel eikonal model.

Contribution

It provides a quantitative analysis of the Odderon contribution in collider data at low momentum transfer using a two-channel eikonal model, accounting for screening effects.

Findings

Constraints on Odderon amplitude at low $|t|$

Evidence for Odderon effects in collider data

Quantitative estimates of Odderon contribution

Abstract

Odderon is the $C$-odd amplitude that does not fall (or decrease very slowly) with energy. The expected amplitude is small and mainly real. Therefore, extracting it from the data on top of a much larger $C$-even contribution is challenging. The only chance is to consider the very low $|t|$ region of Coulomb nuclear interference or the diffractive dip region. Here we perform the analysis of elastic scattering $pp$ and $\bar pp$ data at low momentum transfer $|t| < 0.1$ GeV$^2$ within large collider energy interval $\sqrt s = 50$ GeV $-$ 13 TeV in order to evaluate quantitatively the possible Odderon contribution. We use the two-channel eikonal model, which naturally accounts for the screening of the Odderon amplitude by the $C$-even (Pomeron) exchanges.