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Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions

Abstract

Measurements of the cross-section for producing \bquark quarks in the reaction are reported in 7 and 13 TeV collisions at the LHC as a function of the pseudorapidity in the range covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of -flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross-sections in the covered range are b and b for 7 and 13 TeV. The ratio is , where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7 TeV, but differs somewhat at 13 TeV. The measured ratio of cross-sections is larger at lower than the model prediction.