In a special run of the LHC with β⋆=2.5 km, proton–proton elastic-scattering events were recorded at sqrt(s)=13 TeV with an integrated luminosity of 340 μb^{−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} GeV^2 to −t=0.46 GeV^2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σ_{tot}, parameters of the nuclear slope, and the ρ-parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit t→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. The results for σ_{tot} and ρ are σ_{tot}(pp→X)=104.7±1.1 mb ρ=0.098±0.011. The uncertainty in σ_{tot} is dominated by the luminosity measurement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.

Measurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at sqrt(s)=13 TeV with the ATLAS detector / Anulli, F.; Artoni, G.; Bagnaia, P.; Bauce, M.; Betti, A.; Bini, C.; Bruscino, N.; Carnesale, M.; Chomont, A. R.; Corradi, M.; De Salvo, A.; Di Bello, F. A.; Di Domenico, A.; Falciano, S.; Gauzzi, P.; Gentile, S.; Giagu, S.; Ippolito, V.; Kado, M.; Lacava, F.; Longarini, I.; Luci, C.; Martinelli, L.; Morodei, F.; Nisati, A.; Padovano, G.; Pasqualucci, E.; Pompa Pacchi, E.; Rosati, S.; Sabetta, L.; Safai Tehrani, F.; Santi, L.; Vari, R.; Veneziano, S.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:5(2023). [10.1140/epjc/s10052-023-11436-8]

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

G. Artoni;P. Bagnaia;M. Bauce;A. Betti;C. Bini;M. Carnesale;A. R. Chomont;A. De Salvo;F. A. Di Bello;A. Di Domenico;S. Falciano;P. Gauzzi;S. Gentile;S. Giagu;V. Ippolito;M. Kado;F. Lacava;I. Longarini;C. Luci;L. Martinelli;F. Morodei;G. Padovano;E. Pompa Pacchi;L. Sabetta;F. Safai Tehrani;L. Santi;
2023

Abstract

In a special run of the LHC with β⋆=2.5 km, proton–proton elastic-scattering events were recorded at sqrt(s)=13 TeV with an integrated luminosity of 340 μb^{−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} GeV^2 to −t=0.46 GeV^2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σ_{tot}, parameters of the nuclear slope, and the ρ-parameter defined as the ratio of the real part to the imaginary part of the elastic-scattering amplitude in the limit t→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. The results for σ_{tot} and ρ are σ_{tot}(pp→X)=104.7±1.1 mb ρ=0.098±0.011. The uncertainty in σ_{tot} is dominated by the luminosity measurement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.
2023
High Energy Physics, ATLAS experiment, Standard Model
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at sqrt(s)=13 TeV with the ATLAS detector / Anulli, F.; Artoni, G.; Bagnaia, P.; Bauce, M.; Betti, A.; Bini, C.; Bruscino, N.; Carnesale, M.; Chomont, A. R.; Corradi, M.; De Salvo, A.; Di Bello, F. A.; Di Domenico, A.; Falciano, S.; Gauzzi, P.; Gentile, S.; Giagu, S.; Ippolito, V.; Kado, M.; Lacava, F.; Longarini, I.; Luci, C.; Martinelli, L.; Morodei, F.; Nisati, A.; Padovano, G.; Pasqualucci, E.; Pompa Pacchi, E.; Rosati, S.; Sabetta, L.; Safai Tehrani, F.; Santi, L.; Vari, R.; Veneziano, S.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:5(2023). [10.1140/epjc/s10052-023-11436-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1682593
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