Measurement of direct CP violation parameters in B^+/- -> J/ψK^+/- and B^+/- ->J/psi pi^+/- decays with 10.4 fb^-1 of Tevatron data

Abstract

We present a measurement of the direct CP-violating charge asymmetry in B^+/- mesons decaying to J/psi K^+/- and J/psi pi^+/- where J/psi decays to mu^+ mu^-, using the full Run II data set of 10.4 fb^-1 of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. A difference in the yield of B^- and B^+ mesons in these decays is found by fitting to the difference between their reconstructed invariant mass distributions resulting in asymmetries of ajpk =[0.59 +/- 0.37]%, which is the most precise measurement to date, and ajppi= [-4.2 +/- 4.5]%. Both measurements are consistent with standard model predictions.

7 pages, 2 figures, accepted for publication in Phys. Rev. Lett (updated with modifications made after review)

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• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Observation and Properties of L=1 B_1 and B_2* Mesons
• Measurements of the branching fractions and CP asymmetries of B+ to J/psi pi+ and B+ to psi(2S) pi+ decays
• Study of direct CP violation in $B^{\pm }\to J/\psi K^{\pm }({\pi }^{\pm })$ decays
• Search for CP violating charge asymmetry in B^+ -> J/psi K^+ decays

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