An improved measurement of direct CP violation parameters in B± → J/ψK± and B± → J/ψπ± decays

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作者：
Bertram, Iain [1 ]
机构：
[1] Univ Lancaster, Lancaster, England
来源：
14TH INTERNATIONAL CONFERENCE OF B-PHYSICS AT HADRON MACHINES (BEAUTY 2013) | 2013年
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中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
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摘要：
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 A(J/psi K) = [0.59 +/- 0.36] %, which is the most precise measurement to date, and A(J/psi pi) = [-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 A(J/psi K) and A(J/psi pi).
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