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We present a measurement of the direct CP-violating charge asymmetry in B^pmmesons decaying to J/psi K^pm and J/psi pi^pm where J/psi decays to mu^+ mu^-,using 10.4 fb$^-1 of proton-antiproton collisions collected by the D0 detectorduring Run II at the Fermilab Tevatron Collider. A difference in the yield ofB^- and B^+ mesons in these decays is found by fitting to the differencebetween their reconstructed invariant mass distributions resulting inasymmetries of ajpk =[ 0.59 \pm 0.36 ]%, which is the most precise measurementto date, and ajppi= [ -4.2 \pm 4.8 ]%.Both measurements are consistent withstandard model predictions. These measurements are combined with all previousmeasurements to form new world averages of \ajpk\ and \ajppi .

An improved measurement of direct CP violation parameters in B^pm -> J/psi K^pm and B^pm -> J/psi pi^pm decays