XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects

Comparison of pp and pp¯ differential elastic cross sections an d observation of the exchange of a colorless C-odd gluonic compound (D0 and TOTEM collaborations)

15 Apr 2021, 11:30

18m

Virtual (Stony Brook, NY)

Contributed Talk Small-x, Diffraction and Vector Mesons Small-x, Diffraction and Vector Mesons

Speaker

Christophe Royon (University of Kansas)

Description

We describe an analysis comparing the $p\overline{p}$ elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96~TeV to that in $pp$ collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV using a model-independent approach. The TOTEM cross sections extrapolated to a center-of-mass energy of $\sqrt{s}=$ 1.96 TeV are compared with the D0 measurement in the region of the diffractive minimum and the second maximum of the $pp$ cross section.
The two data sets disagree at the 3.4$\sigma$ level and thus provide evidence for the $t$-channel exchange of a colorless, $C$-odd gluonic compound, also known as the odderon.
We combine these results
with a TOTEM analysis of the same $C$-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic scattering amplitude in $pp$ scattering.
The combined significance is larger than 5$\sigma$ and is interpreted as the first
observation of the exchange of a colorless, $C$-odd gluonic compound.

Presentation materials

dis2021_odderon.pdf

Youtube Link