PoS - Proceedings of Science
Volume 397 - The Ninth Annual Conference on Large Hadron Collider Physics (LHCP2021) - Qcd
The first experimental observation of odderon exchange
F.J. Nemes*  on behalf of the Do and TOTEM collaborations
Full text: pdf
Pre-published on: October 20, 2021
Published on: November 17, 2021
We describe an analysis comparing the ${\rm p}\bar{\rm p}$ 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 data-driven 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 strong
interaction scattering amplitude in pp scattering for which the significance is between 3.4$\sigma$ and 4.6$\sigma$. 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.
DOI: https://doi.org/10.22323/1.397.0280
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