@misc{10481/82757,
year = {2023},
month = {5},
url = {https://hdl.handle.net/10481/82757},
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.},
organization = {CEA-DRF},
organization = {DNSRC
	IN2P3-CNRS},
organization = {EU-ESF},
organization = {GenT Programmes Generalitat Valenciana, Spain},
organization = {La Caixa Banking Foundation},
organization = {PROMETEO},
organization = {UNCE
	SCI/013},
organization = {CRC Health Group 21/SCI/017	CRC},
organization = {H2020 Marie Skłodowska-Curie Actions  MSCA},
organization = {CERN},
organization = {European Research Council ERC},
organization = {European Cooperation in Science and Technology COST},
organization = {Generalitat de Catalunya},
organization = {Agencia Nacional de Promoción Científica y Tecnológica
	ANPCyT},
organization = {Ministerio de Ciencia e Innovación
 	MICINN},
organization = {Horizon 2020},
organization = {European Regional Development Fund
 	ERDF},
organization = {Agencia Nacional de Investigación y Desarrollo
 	ANID},
publisher = {Springer Nature},
title = {Measurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at √s = 13 TeV with the ATLAS detector},
doi = {10.1140/epjc/s10052-023-11436-8},
author = {Aad, G. and Aguilar Saavedra, Juan Antonio and Rodríguez Chala, Mikael and Atlas Collaboration},
}