The b over(b, ̄) production cross section in 920 GeV proton-nucleus fixed target collisions is measured by observing double muonic decays of b-flavoured hadrons in the kinematic region - 0.3 < x F (μ) < 0.15. A total number of 83 ± 12 b over(b, ̄) events is obtained with a likelihood fit of the signal and background simulated events to the data. The resulting cross section is σ b over(b, ̄) = 17.5 ± 2.6 stat ± 3.3 sys nb / nucleon, or, when combined with a previous HERA-B measurement of similar precision, σ b over(b, ̄) = 15.8 ± 1.7 stat ± 1.3 sysuncorr ± 2.0 syscorr nb / nucleon, which is consistent with recent NLO calculations. © 2007.
Abt, I., Adams, M., Agari, M., Albrecht, H., Aleksandrov, A., Amaral, V., … Zoccoli, A. (2007). Bottom production cross section from double muonic decays of b-flavoured hadrons in 920 GeV proton-nucleus collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 650(2–3), 103–110. https://doi.org/10.1016/j.physletb.2007.04.022