Measurement of inclusive production of charmonium states in B meson decays

TL;DR

This paper measures the rates of B meson decays into various charmonium states, providing key data on their production probabilities in a large dataset from the BABAR experiment.

Contribution

It presents the first measurements of inclusive B decay branching fractions to psi(2S) and chi_C1 with improved precision, and sets limits on chi_C2 decays.

Findings

Branching fraction to psi(2S): (0.25±0.02±0.02)%

Branching fraction to chi_C1: (0.39±0.04±0.04)%

Limit on chi_C2 decays: <0.24% at 90% CL

Abstract

We reconstruct the charmonium mesons J/psi, psi(2S) and chi_C1 using a sample of 8.46 x 10^6 B-anti-B events collected by the BABAR detector operating at e^+e^- center of mass energies near the Y(4S) resonance. By measuring rates relative to the branching fraction of the J/psi, we obtain preliminary inclusive B branching fractions of (0.25+/-0.02+/-0.02)% to the psi(2S) and (0.39+/-0.04+/-0.04)% to the chi_C1, and set a 90% confidence level limit of 0.24% on decays through the chi_C2.