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Measurement of the inelastic proton-proton cross section at √s =13 TeV with the ATLAS detector at the LHC

Research output: Contribution to journalJournal article

  • ATLAS Collaboration
Article number182002
<mark>Journal publication date</mark>26/10/2016
<mark>Journal</mark>Physical review letters
Issue number18
Number of pages19
Publication statusPublished
Original languageEnglish


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=M2X/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.