Measurement of the $J / ψ$ meson and $b$ -hadron production cross sections in $p \bar{p}$ collisions at $\sqrt{s} = 1960 G e V$

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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 G e V

. The data correspond to an integrated luminosity of

39.7 {p b}^{- 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 G e V / c

in the rapidity range

| y | < 0.6

to be

4.08 \pm 0.02 (s t a t)_{- 0.33}^{+ 0.36} (s y s t) μ b

. 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

p_{T} (J / ψ) > 1.25 G e V / 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 G e V / c

in the rapidity range

| y (J / ψ) | < 0.6

0.330 \pm 0.005 (s t a t)_{- 0.033}^{+ 0.036} (s y s t) μ b

. 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 G e V

. We find the total single

b

-hadron cross section integrated over all transverse momenta for

b

hadrons in the rapidity range

| y | < 0.6

to be

17.6 \pm 0.4 (s t a t)_{- 2.3}^{+ 2.5} (s

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