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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 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.
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http://hal.in2p3.fr/in2p3-00810067
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, April 10, 2013 - 9:28:42 AM
Last modification on : Thursday, November 19, 2020 - 12:58:39 PM

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V.M. Abazov, G. Sajot, J. Stark, S. Greder, F. Miconi, et al.. Measurement of direct CP violation parameters in B^+/- -> J/ψK^+/- and B^+/- ->J/psi pi^+/- decays with 10.4 fb^-1 of Tevatron data. Physical Review Letters, American Physical Society, 2013, 110, pp.241801. ⟨10.1103/PhysRevLett.110.241801⟩. ⟨in2p3-00810067⟩

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