Measurement of the $b \bar b$ Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions

Details Measurement of the $b \bar b$ Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions Measurement of the $b \bar b$ Production Cross Section in 920 GeV Fixed-Target Proton-Nucleus Collisions

2002-05-31

arxiv.org/abs/hep-ex/0205106v1

Eur.Phys.J.C26:345-355,2003

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages, 10 Postscript figures

Scientific paper

10.1140/epjc/s2002-01071-8

Using the HERA-B detector, the b-bbar production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b-bbar production was tagged via inclusive bottom quark decays into J/psi, by exploiting the longitudinal separation of J/psi->ll decay vertices from the primary proton-nucleus interaction. Both $e^+e^-$ and $\mu^+\mu^-$ channels have been reconstructed and the combined analysis yields the cross section $\sigma(b \bar b) = 32 ^{+14}_{-12} (stat) ^{+6}_{-7} (sys) nb/nucleon$.

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