Baringer, Philip S.Bean, AliceHensel, CarstenMoulik, TaniaWilson, Graham WallaceAbazov, V. M.Abbott, B.Abolins, M.Acharya, B. S.Adams, M.Adams, T.2014-11-032014-11-032008-05-30V. M. Abazov et al. (D0 Collaboration). (2008). "Study of Direct CP Violation in B(±)→J/ψK(±)(π(±)) Decays." Physical Review Letters, 100(21):211802. http://dx.doi.org/10.1103/PhysRevLett.100.2118020031-9007https://hdl.handle.net/1808/15508This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.100.211802.We present a search for direct CP violation in B(±)→J/ψK(±)(π(±)) decays. The event sample is selected from 2.8  fb(−1) of pp-bar collisions recorded by D0 experiment in run II of the Fermilab Tevatron Collider. The charge asymmetry ACP(B(+)→J/ψK(+))=+0.0075±0.0061(stat)±0.0030(syst) is obtained using a sample of approximately 40 000 B(±)→J/ψK(±) 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(+)→J/ψπ(+))=−0.09±0.08(stat)±0.03(syst).Article10.1103/PhysRevLett.100.211802openAccess