Measurement of the CP-violating phase φs in Bs->J/ψπ+π- decays

Details Measurement of the CP-violating phase φs in Bs->J/ψπ+π- decays Measurement of the CP-violating phase φs in Bs->J/ψπ+π- decays

2012-04-25

arxiv.org/abs/1204.5675v2

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 10 figures

Scientific paper

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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