Measurement of the J/ψ meson and b-hadron production cross sections in pp- collisions at sqrt[s]=1960??GeV

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We present a new measurement of the inclusive and differential production cross sections of J/ψ mesons and b hadrons in proton-antiproton collisions at sqrt[s]=1960??GeV. The data correspond to an integrated luminosity of 39.7??pb-1 collected by the CDF run II detector. We find the integrated cross section for inclusive J/ψ production for all transverse momenta from 0 to 20??GeV/c in the rapidity rangey <0.6 to be 4.08±0.02(stat)-0.33+0.36(syst)??μb. We separate the fraction of J/ψ events from the decay of the long-lived b hadrons using the lifetime distribution in all events with pT(J/ψ)>1.25??GeV/c. We find the total cross section for b hadrons including both hadrons and antihadrons decaying to J/ψ with transverse momenta greater than 1.25??GeV/c in the rapidity range y(J/ψ) <0.6 is 0.330±0.005(stat)-0.033+0.036(syst)??μb. Using a Monte Carlo simulation of the decay kinematics of b hadrons to all final states containing a J/ψ we extract the first measurement of the total single b-hadron cross section down to zero transverse momentum at sqrt[s]=1960??GeV. We find the total single b-hadron cross section integrated over all transverse momenta for b hadrons in the rapidity rangey <0.6 to be 17.6±0.4(stat)-2.3+2.5(syst)??μb.

Journal

  • Physical review D

    Physical review D 71 (3), 032001-, 2005-02

    The American Physical Society

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