PoS - Proceedings of Science
Volume 450 - The Eleventh Annual Conference on Large Hadron Collider Physics (LHCP2023) - session Poster session
Measurement of the Total Cross Section and $\rho$-parameter from Elastic Scattering at $\sqrt{s}$ = 13 TeV
S.J. Arbiol Val*  on behalf of the ATLAS Collaboration
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Pre-published on: January 15, 2024
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The study of elastic scattering in hadron colliders provides valuable insights into non-perturbative dynamics that are inaccessible to analytic calculations. The ALFA detector, a subsystem of the ATLAS detector, consists of four Roman Pot stations set at both sides of the ATLAS interaction point. Roman Pot technology allows the detectors to be placed at very small distances from the beam and thus measure the very low scattering angles associated with elastic scattering. We present the results of the study of a data-taking campaign that collected an integrated luminosity of 340~$\mu b^{-1}$ at $\sqrt{s}$ = 13 TeV. The key observables are the total hadronic cross section $\sigma_{tot}(pp \rightarrow X$) and the $\rho$-parameter. The results give a $\sigma_{tot}$ of $104.68 \pm 1.08$ mb and a $\rho$-parameter of $0.0978 \pm± 0.0085$. The main uncertainties in these measurements arise from luminosity and alignment. A 2.2 $\sigma$ tension with TOTEM's collaboration result for $\sigma_{tot}$ is found, attributed to differences in absolute normalization methods.
DOI: https://doi.org/10.22323/1.450.0263
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