Measurement of the $b\overline{b}$ production cross section in 920 GeV fixed-target proton-nucleus collisions
European Physical Journal C(2003)
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
$\sigma(b \bar b) = 32 ^{+14}_{-12} (stat) ^{+6}_{-7} (sys) nb/nucleon$.
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Key words
Titanium,Production Cross,Combine Analysis,Production Cross Section,Bottom Quark
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