Measurement of Inclusive B --> psi Production

TL;DR

This paper measures properties of Psi mesons produced from B decays, including polarization, momentum distributions, and branching fractions, using combined CLEO data at the Upsilon(4S).

Contribution

First measurements of Psi polarization in B decays and improved momentum distribution and branching fraction measurements.

Findings

Measured Psi polarization: alpha(J/Psi) = -0.30 ± 0.07(stat) ± 0.04(syst)

Measured Psi(2S) polarization: alpha(Psi(2S)) = -0.45 ± 0.22(stat) ± 0.04(syst)

Provided improved momentum distributions and branching fractions for B -> Psi X and B -> Chi_c1 X.

Abstract

Using the combined CLEO II and CLEO II.V data sets of 9.1 fb^{-1} at the Upsilon(4S), we measure properties of Psi mesons produced directly from decays of the B meson, where ``B'' denotes an admixture of B+, B-, B0, and B0bar, and ``Psi'' denotes either J/Psi or Psi(2S). We report first measurements of Psi polarization in B -> Psi(direct) X: alpha(J/Psi) = -0.30 {+0.07 -0.06 stat} {+-0.04 syst} and alpha(Psi(2S)) = -0.45 {+0.22 -0.19 stat} {+-0.04 syst}. We also report improved measurements of the momentum distributions of Psi produced directly from B decays, correcting for measurement smearing. Finally, we report measurements of the inclusive branching fraction for B -> Psi X and B -> Chi_c1 X.