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Title: Measurement of the total cross section and ? -parameter from elastic scattering in pp collisions at ?s=13 TeV with the ATLAS detector
Authors: Aad, G.
Abbott, B.
Abbott, D.C.
Abeling, K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Issue Date: 2023
Publisher: Institute for Ionics
Abstract: In a special run of the LHC with ??= 2.5 km, proton–proton elastic-scattering events were recorded at s=13 TeV with an integrated luminosity of 340?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 GeV 2 to - t= 0.46 GeV 2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section ?tot , parameters of the nuclear slope, and the ? -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 ?tot and ? are ?tot(pp?X)=104.7±1.1mb,?=0.098±0.011. The uncertainty in ?tot is dominated by the luminosity measurement, and in ? by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude. © 2023, The Author(s).
ISSN: 1434-6044
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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