Search for CP violation in B+- -> J/psi K+- and B+- -> psi(2S) K+- decays

TL;DR

This study searches for direct CP violation in specific B meson decays using a large dataset, finding no significant asymmetry within experimental uncertainties.

Contribution

First measurement of CP-violating charge asymmetry in B+- -> J/psi K+- and B+- -> psi(2S) K+- decays with a large dataset and low background.

Findings

Measured asymmetry for B+- -> J/psi K+-: (+1.8+-4.3[stat]+-0.4[syst])%

Measured asymmetry for B+- -> psi(2S) K+-: (+2.0+-9.1[stat]+-1.0[syst])%

No evidence of direct CP violation observed.

Abstract

We present a search for direct CP violation in B+- -> J/psi K+- and B+- -> psi(2S) K+- decays. In a sample of 9.7 million B meson pairs collected with the CLEO detector, we have fully reconstructed 534 B+- -> J/psi K+- and 120 B+- -> psi(2S) K+- decays with very low background. We have measured the CP-violating charge asymmetry to be (+1.8+-4.3[stat]+-0.4[syst])% for B+- -> J/psi K+- and (+2.0+-9.1[stat]+-1.0[syst])% for B+- -> psi(2S) K+-.