bb-bar Production Cross Section in 920 GeV p-N Collisions
Abstract
The b-bbar production cross section in 920 GeV proton - nucleus collisions was obtained with the HERA-B detector, using a sample of 1.35 million of di-lepton triggered events taken during the 2000 physics run. The b-bbar events are identified via the inclusive decay b->J/psi, where the J/Psi mesons decay to mu+mu- or e+e-. The b events are separated from directly produced J/psi's by requiring that the J/psi decay vertex does not coincide with the primary vertex. The total measured cross section per nucleon, combining the results obtained in the two channels, is 32 +14 -12(stat) +6 -7(sys) nb/nucleon. The result is compared with the most recent QCD prediction and other experimental results. A much more precise measurement will be obtained from the 2002/2003 data.
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