Rare B Decays into States Containing a J/psi Meson and a Meson with ssbar Quark Content

TL;DR

This paper investigates specific B meson decay modes involving J/psi and ssbar-containing mesons, measuring branching fractions and setting upper limits using data from the BABAR detector at PEP-II.

Contribution

It provides the first measurements and upper limits for several rare B meson decay channels involving J/psi and ssbar mesons.

Findings

Measured B+ -> J/psi phi K+ branching fraction as (4.4 +- 1.4 +- 0.5) x 10^-5.

Measured B0 -> J/psi phi K0S branching fraction as (5.1 +- 1.9 +- 0.5) x 10^-5.

Set upper limits for B0 -> J/psi phi, J/psi eta, and J/psi eta' decays.

Abstract

We report a study of the B meson decays, B+ -> J/psi phi K+, B0 -> J/psi phi K0S, B0 -> J/psi phi, B0 -> J/psi eta and B0 -> J/psi eta' using 56 million BBbar events collected at the Y(4S) resonance with the BABAR detector at the PEP-II e+ e- asymmetric-energy storage ring. We measure the branching fractions B(B+ -> J/psi phi K+) = (4.4 +- 1.4(stat) +- 0.5(syst)) * 10-5 and B(B0 -> J/psi phi K0S) = (5.1 +- 1.9(stat) +- 0.5(syst)) * 10^-5, and set upper limits at 90% confidence level for the branching fractions B(B0 -> J/psi phi) < 9.2 * 10^-6, B(B0 -> J/psi eta)< 2.7 * 10^-5, and B(B0 -> J/psi eta')< 6.3 * 10-5.