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

Abstract

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 $\sigma (b\bar{b})=32_{-12}^{+14}(stat{)}_{-7}^{+6}(sys)nb/nucleon$.

22 pages, 10 Postscript figures

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