Measurement of the CP-violating phase \phi s in Bs->J/\psi\pi+\pi- decays
LHCb collaboration: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi,, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander,, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, Y. Amhis,, J. Anderson, R. B. Appleby, O. Aquines Gutierrez
TL;DR
This paper measures the CP-violating phase phi_s in Bs decays using LHCb data, finding results consistent with the Standard Model and no evidence of direct CP violation.
Contribution
First measurement of phi_s in Bs->J/psi pi+ pi- decays with a large data sample at 7 TeV, providing a precise test of the Standard Model.
Findings
Measured phi_s consistent with Standard Model
No evidence of direct CP violation
Large sample of 7421 signal events
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.
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