28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Search for a colorless C-odd three-gluon state from comparison of elastic proton proton and proton antiproton scattering

29 Jul 2020, 15:30
25m
virtual conference

virtual conference

Talk 06. Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speaker

Christophe Royon (The University of Kansas (US))

Description

Elastic scattering is usually described by the $t$-channel exchange of a $C$-even state (the “Pomeron”) that contributes equally to the $pp$ and $p\bar{p}$ cross sections. QCD also predicts the exchange of a sub-dominant $C$-odd state (the “Odderon”) that has opposite sign in the $pp$ and $p\bar{p}$ amplitudes and that QCD describes as a three-gluon state at leading order. At TeV energies where other exchanges than gluonic are expected to be negligible, a difference between the $pp$ and $p\bar{p}$ elastic differential cross sections ($d\sigma_{el}/dt$) would give evidence for $C$-odd three-gluon exchange.
The $pp$ elastic cross sections at 2.76, 7, 8 and 13 TeV measured by TOTEM at the LHC have characteristic diffractive minima (“dips”) and second maxima (“bumps”), whereas the $p\bar{p}$ cross section at 1.96 TeV measured by D0 at the Tevatron has no dip. We have performed an extrapolation of the $pp$ $d\sigma_{el}/dt$ from TOTEM to 1.96 TeV and compared it with the D0 data to search for the presence of $C$-odd three-gluon exchange.

Primary author

Christophe Royon (The University of Kansas (US))

Presentation Materials