Study of Direct CP Violation in B±J/ψK±(π±) Decays

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. Lett. 100, 211802 – Published 30 May 2008

Abstract

We present a search for direct CP violation in B±J/ψK±(π±) decays. The event sample is selected from 2.8fb1 of pp¯ 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).

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  • Received 26 February 2008

DOI:https://doi.org/10.1103/PhysRevLett.100.211802

©2008 American Physical Society

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Vol. 100, Iss. 21 — 30 May 2008

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