Measurement of the time-dependent CP asymmetry in B0 -> J/{\psi} KS0 decays
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, 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, L. Anderlini, J. Anderson
TL;DR
This paper reports a precise measurement of CP violation parameters in B0 decays to J/ψ KS0 using LHCb data, confirming consistency with Standard Model predictions.
Contribution
First measurement of CP violation observables S and C in B0 -> J/ψ KS0 decays at 7 TeV with LHCb, improving precision over previous results.
Findings
Measured S_J/ψKS0 = 0.73 ± 0.07 (stat) ± 0.04 (syst)
Measured C_J/ψKS0 = 0.03 ± 0.09 (stat) ± 0.01 (syst)
Results are consistent with Standard Model expectations.
Abstract
This Letter reports a measurement of the CP violation observables S_J/{\psi}KS0 and C_J/{\psi}KS0 in the decay channel B0 -> J/{\psi} KS0 performed with 1.0/fb of pp collisions at sqrt(s) = 7 TeV collected by the LHCb experiment. The fit to the data yields S_J/{\psi}KS0 = 0.73 +- 0.07 (stat) +- 0.04 (syst) and C_J/{\psi}KS0 = 0.03 +- 0.09 (stat) +- 0.01 (syst). Both values are consistent with the current world averages and within expectations from the Standard Model.
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