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The inelastic hadronic cross section in proton-lead collisions at acentre-of-mass energy per nucleon pair of 5.02 TeV is measured with the CMSdetector at the LHC. The data sample, corresponding to an integrated luminosityof 12.6 +/- 0.4 inverse nanobarns, has been collected with an unbiased triggerfor inclusive particle production. The cross section is obtained from themeasured number of proton-lead collisions with hadronic activity produced inthe pseudorapidity ranges 3 < eta < 5 and/or -5 < eta < -3, corrected forphoton-induced contributions, experimental acceptance, and other instrumentaleffects. The inelastic cross section is measured to be sigma[inel,pPb] = 2061+/- 3 (stat) +/- 34 (syst) +/- 72 (lum) mb. Various Monte Carlo generators,commonly used in heavy ion and cosmic ray physics, are found to reproduce thedata within uncertainties. The value of sigma[inel,pPb] is compatible with thatexpected from the proton-proton cross section at 5.02 TeV scaled up within asimple Glauber approach to account for multiple scatterings in the leadnucleus, indicating that further net nuclear corrections are small.

Measurement of the inelastic cross section in proton-lead collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV