Measurement of the Inelastic Proton-Proton Cross Section at √s=13 TeV with the ATLAS Detector at the LHC

Aaboud, M. and Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2016) Measurement of the Inelastic Proton-Proton Cross Section at √s=13 TeV with the ATLAS Detector at the LHC. PHYSICAL REVIEW LETTERS, 117 (18). ISSN 0031-9007

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Abstract

This Letter presents a measurement of the inelastic proton-proton cross section using 60 μb−1 of pp collisions at a center-of-mass energy √s of 13 TeV with the ATLAS detector at the LHC. Inelastic interactions are selected using rings of plastic scintillators in the forward region (2.07 < |η| < 3.86) of the detector. A cross section of 68.1 ± 1.4 mb is measured in the fiducial region ξ = M2 X /s > 10−6, where MX is the larger invariant mass of the two hadronic systems separated by the largest rapidity gap in the event. In this ξ range the scintillators are highly efficient. For diffractive events this corresponds to cases where at least one proton dissociates to a system with MX > 13 GeV. The measured cross section is compared with a range of theoretical predictions. When extrapolated to the full phase space, a cross-section of 78.1 ± 2.9 mb is measured, consistent with the inelastic cross section increasing with center-of-mass energy.

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