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Measurement of direct CP violation parameters in B(±)→J/ψK(±) and B(±)→J/ψπ(±) decays with 10.4 fb(−1) of Tevatron data
Baringer, Philip S. Bean, Alice Chen, G. Clutter, Justace Randall Sekaric, Jadranka Wilson, Graham Wallace Abazov, V. M. Abbott, B. Acharya, B. S. Adams, M.
Baringer, Philip S.
Bean, Alice
Chen, G.
Clutter, Justace Randall
Sekaric, Jadranka
Wilson, Graham Wallace
Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
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Abstract
We present a measurement of the direct CP-violating charge asymmetry in B(±) mesons decaying to J/ψK(±) and J/ψπ(±) where J/ψ decays to μ(+)μ(−), 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 A(J/ψK)=[0.59±0.37]%, which is the most precise measurement to date, and A(J/ψπ)=[−4.2±4.5]%. Both measurements are consistent with standard model predictions.
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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.241801.
Date
2013-06-12
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American Physical Society
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Baringer_6-12-2013.pdf
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V. M. Abazov et al. (D0 Collaboration). (2013). "Measurement of direct CP violation parameters in B(±)→J/ψK(±) and B(±)→J/ψπ(±) decays with 10.4 fb(−1) of Tevatron data." Physical Review Letters, 110(24):241801. http://dx.doi.org/10.1103/PhysRevLett.110.241801.