Measurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector

0577322 - FZÚ 2024 RIV DE eng J - Journal Article
Aad, G. - Abbott, B. - Abbott, D.C. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2924 authors
Measurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector.
European Physical Journal C. Roč. 83, č. 5 (2023), č. článku 441. ISSN 1434-6044. E-ISSN 1434-6052
Research Infrastructure: CERN-CZ III - 90240
Institutional support: RVO:68378271
Keywords : ATLAS * detector: alignment * rho parameter
OECD category: Particles and field physics
Impact factor: 4.4, year: 2022
Method of publishing: Open access

In a special run of the LHC with β⋆=2.5β⋆=2.5 km, proton–proton elastic-scattering events were recorded at s=13s ​=13 TeV with an integrated luminosity of 340~upmu { ext {b}}^{-1} using the ALFA subdetector of ATLAS in 2016. The elastic cross section was measured differentially in the Mandelstam t variable in the range from −t=2.5⋅10−4−t=2.5⋅10−4 GeV22 to −t=0.46−t=0.46 GeV22 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σtotσtot​, parameters of the nuclear slope, and the ρρ-parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit t→0t→0. These parameters are determined from a fit to the differential elastic cross section using the optical theorem and different parameterizations of the t-dependence.
Permanent Link: https://hdl.handle.net/11104/0346537