Measurement of the CP-violating phase phi(s) in (B)over-bar(s)(0) -> J/psi pi(+)pi(-) decays

R Aaij, J.F.J. van den Brand, F. Dettori, T.J. Ketel, R. Koopman, R.W. Lambert, H.G. Raven, M. Schiller, Collaboration LHCb

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Measurement of the mixing-induced CP-violating phase Φ<inf>s</inf> in B0<inf>s</inf> decays is of prime importance in probing new physics. Here 7421 ± 105 signal events from the dominantly CP-odd final state J/ψπ+π- are selected in 1 fb-1 of pp collision data collected at √ s = 7 TeV with the LHCb detector. A timedependent fit to the data yields a value of Φ<inf>s</inf> = -0.019+0.173+0.004 <inf>-0.174-0.003</inf> rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.
Original languageEnglish
Pages (from-to)378-386
JournalPhysics Letters B
Issue number4-5
Publication statusPublished - 2012


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