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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Measurement of the total cross section and ρ -parameter from elastic scattering in pp collisions at √s=13 TeV with the ATLAS detector
AU - ATLAS Collaboration
AU - Barton, Adam
AU - Bertram, Iain
AU - Borissov, Guennadi
AU - Bouhova-Thacker, Evelina
AU - Fox, Harald
AU - Henderson, Robert
AU - Jones, Roger William Lewis
AU - Kartvelishvili, Vakhtang
AU - Love, Peter
AU - Meng, Lingxin
AU - Muenstermann, Daniel
AU - Rybacki, Katherine
AU - Smizanska, Maria
AU - Spinali, Sebastiano
AU - Wharton, Andrew
AU - Yexley, Melissa
PY - 2023/5/26
Y1 - 2023/5/26
N2 - 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 areσtot(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.
AB - 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 areσtot(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.
U2 - 10.1140/epjc/s10052-023-11436-8
DO - 10.1140/epjc/s10052-023-11436-8
M3 - Journal article
VL - 83
JO - European Physical Journal C
JF - European Physical Journal C
IS - 5
M1 - 441
ER -