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

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, M.P. Heath, S. Palazzo, V.A. Parrish, E.A. Pender, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 mea-
surement, and in ρ by imperfect knowledge of the detector alignment and by modelling of the nuclear amplitude.
Original languageEnglish
Article number441
Pages (from-to)1-49
Number of pages49
JournalThe European Physical Journal C
Volume83
Issue number5
DOIs
Publication statusPublished - 26 May 2023

Keywords / Materials (for Non-textual outputs)

  • INTERFERENCE
  • POLARIZATION
  • ODDERON
  • MODEL

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