2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 26, 345-355 (2003)
DOI: 10.1140/epjc/s2002-01071-8

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

The HERA - B Collaboration

(Received: 6 June 2002 / Revised version: 2 September 2002 / Published online: 8 November 2002 )

Using the HERA - B detector, the $b\overline{b}$ production cross section has been measured in 920 GeV proton collisions on carbon and titanium targets. The $b\overline{b}$ production was tagged via inclusive bottom quark decays into $J/\psi$ by exploiting the longitudinal separation of $J/\psi\to l^+l^-$ 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 $\sigma(b\overline{b}) = 32 ^{+14} _{-12} \mathrm{(stat)} \,^{+6} _{-7}
\mathrm{(sys)}~ \mathrm{nb/nucleon}$ .

© Società Italiana di Fisica, Springer-Verlag 2003