Recent CMS and CMS-TOTEM results on diffraction and exclusive production

TL;DR

This paper presents recent CMS and CMS-TOTEM measurements of exclusive and diffractive processes, including cross sections for $ ext{π}^+ ext{π}^-$ production and single diffractive dijets, enhancing understanding of non-perturbative QCD.

Contribution

It provides new measurements of exclusive $ ext{π}^+ ext{π}^-$ production and single diffractive dijets using CMS and CMS-TOTEM data, with detailed cross section analyses in specific kinematic regions.

Findings

Measured total and differential cross sections at 5.02 and 13 TeV.

Fitted invariant mass distribution with continuum and Breit-Wigner functions.

Performed joint CMS-TOTEM analysis of diffractive dijets.

Abstract

Exclusive and diffractive physics measurements are important for the better understanding of the non-perturbative regime of QCD. Two recent results of the CMS experiment is presented in this paper. The total and differential cross sections of central exclusive $\pi^+\pi^-$ production are measured at 5.02 and 13 TeV in the $p_{\mathrm{T}}(\pi) > 0.2~$GeV/$c$ and $|\eta(\pi)| < 2.4$ kinematic region. The invariant mass distribution is fitted by the sum of a continuum and four interfering relativistic Breit-Wigner functions. In the second part of the paper the measurement of the single diffractive dijets is presented, which are studied by using proton tagging capabilities of the TOTEM analysis. A joint CMS-TOTEM study is carried out and the total and differential cross sections are measured in the $0.03 < |t| < 1.0~$GeV$^2$ and $0 < \xi < 0.1$ kinematic region.