Research Papers in Physics and Astronomy


Date of this Version

May 2008


Published by American Physical Society. Phys. Rev. Lett. 100, 211802 (2008). Copyright © 2008 American Physical Society. Permission to use.


We present a search for direct CP violation in B±JK±±) decays. The event sample is selected from 2.8 fb-1 of pp collisions recorded by D0 experiment in run II of the Fermilab Tevatron Collider. The charge asymmetry ACP(B+JK+) =+0.0075 ±± 0.0061(stat) ± 0.0030(syst) is obtained using a sample of approximately 40 000 B±JK±decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. We also measured the charge asymmetry ACP(B+JK+) = -0.09 ± 0.08(stat) ± 0.03(syst).

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