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

2013/10/01 by Bertram, Iain A
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1310.0288

Abstract

We present a measurement of the direct CP-violating charge asymmetry in B^pm mesons 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 detector during Run II 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 ± 0.36 ]%, which is the most precise measurement to date, and ajppi= [ -4.2 ± 4.8 ]%.Both measurements are consistent with standard model predictions. These measurements are combined with all previous measurements to form new world averages of \ajpk and \ajppi .

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