Relative rates of B meson decays into psi(2S) and J/psi mesons

TL;DR

This study measures the relative decay rates of B mesons into psi(2S) and J/psi mesons using collider data, providing key insights into B meson decay processes and branching fractions.

Contribution

It presents the first measurements of the relative branching fractions of B meson decays into psi(2S) and J/psi mesons at the Tevatron collider.

Findings

Measured B(B_s^0 -> psi(2S)phi)/B(B_s^0 -> J/psi phi) = 0.55 ± 0.11 (stat) ± 0.07 (syst) ± 0.06 (B)

Measured B(B^+/- -> psi(2S) K^+/-)/B(B^+/- -> J/psi K^+/-) = 0.65 ± 0.04 (stat) ± 0.03 (syst) ± 0.07 (B)

Results are consistent with theoretical predictions and previous measurements.

Abstract

We report on a study of the relative rates of B meson decays into psi(2S) and J/psi mesons using 1.3 fb^-1 of pbar p collisions at sqrt(s) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We observe the channels B^0_s -> psi(2S)phi, B^0_s -> J/psi phi, B^+/- -> psi(2S) K^+/-, and B^+/- -> J/psi K^+/- and we measure the relative branching fractions for these channels to be B(B^0_s -> psi(2S)phi)/B(B^0_s -> J/psi phi) = 0.55 +/- 0.11 (stat) +/- 0.07 (syst) +/- 0.06 (B), B(B^+/- -> psi(2S) K^+/-)/B(B^+/- -> J/psi K^+/-) = 0.65 +/- 0.04 (stat) +/- 0.03 (syst) +/- 0.07 (B) where the final error corresponds to the uncertainty in the J/psi and psi(2S) branching ratio into two muons.