Measurement of the B^+/B^0 Production Ratio from the Upsilon(4S) Meson using B^+ -> J/psi K^+ and B^0 -> J/psi K^{0}_{S} Decays

TL;DR

This paper measures the ratio of charged to neutral B meson production from Upsilon(4S) decays using specific decay modes, providing precise experimental results with implications for B meson production understanding.

Contribution

The study provides the first precise measurement of the B^+/B^0 production ratio from Upsilon(4S) decays using charmonium decay modes with a large data sample.

Findings

Measured ratio R^{+/0} = 1.006 +/- 0.036 (stat) +/- 0.031 (sys)

Results are consistent with equal production of charged and neutral B mesons

Uses 81.9 fb^-1 of data collected with the BABAR detector

Abstract

We report a measurement of the production ratio of charged and neutral B mesons from Upsilon(4S) decays based on the ratio of efficiency-corrected yields for the charmonium modes J/psi K^+ and J/psi K^{0}_{S} with 81.9 fb^-1 of data collected with the BABAR detector on the Upsilon(4S) resonance at 10.580 GeV. We find a value of 1.006 +/- 0.036 (stat) +/- 0.031 (sys) for the ratio R^{+/0}=Gamma(Upsilon(4S) -> B^+ B^-)/Gamma(Upsilon(4S)->B^0 B^0bar).