Measurement of the CP violating phase φ_s in Bs->J/ψf0(980)

Details Measurement of the CP violating phase φ_s in Bs->J/ψf0(980) Measurement of the CP violating phase φ_s in Bs->J/ψf0(980)

2011-12-13

arxiv.org/abs/1112.3056v4

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages 8 figures; 525 additional authors not shown. Final version with journal corrections. To be published in Phys. Lett. B

Scientific paper

Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ yields a value of the CP violating phase of -0.44 +/- 0.44 +/- 0.02 rad, consistent with the Standard Model expectation.

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