Abstract
Using the HERA — B detector, the b b production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The b b production was tagged via inclusive bottom quark decays into J ψ by exploiting the longitudinal separation of J ψ → l +l − 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 b) = 32 −12 +14 ( stat) −7 +6( syst) nb/nucleon.
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