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Title: Improved measurement of the b¯b production cross section in 920 GeV fixed-target proton-nucleus collisions
Author: Conde, P.
Garrido Beltrán, Lluís
Peralta, D.
HERA-B Collaboration
Keywords: Física de partícules
Col·lisions (Física)
Particle physics
Collisions (Physics)
Issue Date: 10-Mar-2006
Publisher: American Physical Society
Abstract: A new measurement of the b ¯ b production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B Collaboration. The b ¯ b production is tagged via inclusive bottom quark decays into J / ψ mesons by exploiting the longitudinal separation of J / ψ → l + l − decay vertices from the primary proton-nucleus interaction point. Both e + e − and μ + μ − channels are reconstructed for a total of 83 ± 12 inclusive b → J / ψ X events found. The combined analysis yields a b ¯ b to prompt J / ψ cross section ratio of Δ σ ( b ¯ b ) Δ σ J / ψ = 0.032 ± 0.005 stat ± 0.004 sys measured in the x F acceptance ( − 0.35 < x F < 0.15 ), extrapolated to σ ( b ¯ b ) = 14.9 ± 2.2 stat ± 2.4 sys     nb/nucleon in the total phase space.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2006, vol. 73, num. 5, p. 052005
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ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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