Measurement of direct CP violation parameters in B^+/- -> J/ψK^+/- and B^+/- ->J/psi pi^+/- decays with 10.4 fb^-1 of Tevatron data - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2013

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

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V.M. Abazov
E. Kajfasz

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.

Dates and versions

in2p3-00810067 , version 1 (10-04-2013)

Identifiers

Cite

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, 2013, 110, pp.241801. ⟨10.1103/PhysRevLett.110.241801⟩. ⟨in2p3-00810067⟩
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