Search for CP violating charge asymmetry in B^+ -> J/psi K^+ decays
K. Sakai, T. Kawasaki, H. Aihara, K. Arinstein, T. Aushev, A. M., Bakich, V. Balagura, E. Barberio, K. Belous, V. Bhardwaj, B. Bhuyan, M., Bischofberger, A. Bondar, A. Bozek, M. Bra\v{c}ko, T. E. Browder, M.-C., Chang, Y. Chao, A. Chen, K.-F. Chen, P. Chen, B. G. Cheon
TL;DR
This paper reports a search for CP violation in B+ decays to J/psi K+, measuring the charge asymmetry to test the Standard Model's predictions about matter-antimatter differences.
Contribution
The study provides the first precise measurement of CP asymmetry in B+ -> J/psi K+ decays, with results consistent with no CP violation.
Findings
Measured A_CP = -0.76% with uncertainties
Results consistent with Standard Model predictions
Improved precision over previous measurements
Abstract
We present the result of a search for charge asymmetry in B^+ -> J/psi K^+ decays. The CP-violating charge asymmetry is measured to be A_CP(B^+ -> J/psi K^+) = [-0.76 +/- 0.50 (stat) +/- 0.22 (syst)]%.
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