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 sqrt[s] of 13TeV 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=M_{X}^{2}/s>10^{-6}, where M_{X} 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 M_{X}>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.
Highlights
This Letter presents a measurement pofffiffithe 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 Large Hadron Collider (LHC)
A cross section of 68.1 Æ 1.4 mb is measured in the fiducial region ξ1⁄4M2X=s>10−6, where MX is the larger invariant mass of the two hadronic systems separated by the largest rapidity gap in the event
Analyticity, and factorization imply an upper bound on the high-energy behavior of total hadronic cross sections that prevents them from rising more rapidly than ln2ðsÞ [3,4,5]
Summary
This Letter presents a measurement pofffiffithe 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. A cross section of 68.1 Æ 1.4 mb is measured in the fiducial region ξ1⁄4M2X=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. This Letter presents a measuremepntffiffiof the inelastic cross section σinel using pp collisions at s 1⁄4 13 TeV with the ATLAS detector at the Large Hadron Collider (LHC) It is performed using two sets of scintillation counters in a data set corresponding to an integrated luminosity of 60.1 Æ 1.1 μb−1 collected in June 2015. To constrain the diffractive component of the cross section and reduce the uncertainty in extrapolation to σinel, an additional singlesided selection is defined, requiring hits in at least two counters on one side of the detector and no hits on the other. 4 159 074 events pass the inclusive selection and 442 192 events pass the single-sided selection
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