Measurement of the CP-violating phase phi s in Bs->J/psi pi+pi- decays

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Measurement of the mixing-induced CP-violating phase phi s in Bs decays is of prime importance in probing new physics. Here 7421 +/- 105 signal events from the dominantly CP-odd final state J/psi pi+pi- are selected in 1/fb of pp collision data collected at sqrt{s} = 7 TeV with the LHCb detector. A time-dependent fit to the data yields a value of \phi s=-0.019^{+0.173+0.004}_{-0.174-0.003} rad, consistent with the Standard Model expectation. No evidence of direct CP violation is found.
Original languageEnglish
Pages (from-to)378-386
Number of pages9
JournalPhysics Letters B
Early online date25 Apr 2012
Publication statusPublished - 18 Jul 2012


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