arxiv: 1204.5675 · v3 · ★pith:SBYUNRZCnew · submitted 2012-04-25 · ✦ hep-ex
Measurement of the CP-violating phase φ s in Bs->J/psiπ+π- decays
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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.
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