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F bb̄ 2 from the ZEUS HERA-II Data

Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA II using an integrated luminosity of 39 pb−1. The fraction of beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative to the jet. The cross section for beauty production was measured in the kinematic range Q > 4 GeV, 0.05 < y < 0.7 and requiring a muon with pμT > 1.5 GeV and η μ > −1.6 and a jet with E T > 5 GeV and −2 < η < 2.5. Differential cross sections in Q, pμT , η, p T and η jet are compared to theory. Furthermore F bb̄ 2 , the beauty contribution to the structure function F2, is obtained and compared to theoretical predictions.