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

ATLAS Collaboration and Barton, Adam and Bertram, Iain and Borissov, Guennadi and Bouhova-Thacker, Evelina and Fox, Harald and Henderson, Robert and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Love, Peter and Meng, Lingxin and Muenstermann, Daniel and Rybacki, Katherine and Smizanska, Maria and Spinali, Sebastiano and Wharton, Andrew and Yexley, Melissa (2023) 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, 83 (5).

Full text not available from this repository.

Abstract

In a special run of the LHC with β⋆=2.5 km, proton–proton elastic-scattering events were recorded at 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 GeV2 to −t=0.46 GeV2 using 6.9 million elastic-scattering candidates. This paper presents measurements of the total cross section σtot , 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 σtot and ρ are σtot(pp→X)=104.7±1.1 mb ,ρ=0.098±0.011. The uncertainty in σtot is dominated by the luminosity measurement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C
ID Code:
195959
Deposited By:
Deposited On:
13 Jun 2023 13:05
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2024 00:14