Phys. Rev. Lett. 74, 3118–3121 (1995)Measurement of the Bottom-Quark Production Cross Section in 800 GeV/c Proton-Gold CollisionsReceived 30 November 1994; revised 11 January 1995; published in the issue dated 17 April 1995 Using a silicon-microstrip detector array to identify secondary vertices, we have observed b→J/ψ→μ+μ- decays in 800 GeV/c proton-gold interactions. The doubly differential cross section for J/ψ mesons originating from b-quark decays, assuming linear dependence on nucleon number, is d2σ/dxFdpT2 = 107±28±19 [pb/(GeV/c)2]/nucleon at xF = 0.05 and pT = 1 GeV/c. This measurement is compared to next-to-leading-order QCD predictions. The integrated b-quark production cross section, obtained by extrapolation over all xF and pT, is σ(pN→bb̅ +X) = 5.7±1.5±1.3 nb/nucleon. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.3118
DOI:
10.1103/PhysRevLett.74.3118
PACS:
13.85.Ni, 25.38.Qk, 24.85.+p, 25.40.Ve
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