Measurement of the $b\overline{b}$ production cross section in 920 GeV fixed-target proton-nucleus collisions

I. Abt et al.
2003 European Physical Journal C: Particles and Fields  
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 μ^+μ^- channels have been reconstructed and the combined analysis yields the cross section σ(b b̅) = 32 ^+14_-12 (stat) ^+6_-7 (sys) nb/nucleon.
doi:10.1140/epjc/s2002-01071-8 fatcat:ijquirm6ercxpo2tfu4ydmvmpi