Abstract
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 language | English |
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Pages (from-to) | 378-386 |
Number of pages | 9 |
Journal | Physics Letters B |
Volume | B713 |
Early online date | 25 Apr 2012 |
DOIs | |
Publication status | Published - 18 Jul 2012 |