Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-02-04
Eur.Phys.J.C41:453-467,2005
Physics
High Energy Physics
High Energy Physics - Experiment
33 pages, 11 figures, 6 tables
Scientific paper
10.1140/epjc/s2005-02267-0
A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 1999-2000. Events are selected by requiring the presence of jets and muons in the final state. Both the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in photoproduction, with photon virtualities Q^2 < 1 GeV^2, and in deep inelastic scattering, where 2 < Q^2 < 100 GeV^2. The results are compared with perturbative QCD calculations to leading and next-to-leading order. The predictions are found to be somewhat lower than the data.
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