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Abstract |
The time-dependent CP asymmetry in B-0 -> J/psi rho (770)(0) decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb(-1), collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2 beta(eff)(c (c) over bard) = 0.710 +/- 0.084 +/- 0.051 rad and vertical bar lambda vertical bar = 1.019 +/- 0.034 +/- 0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of timedependent CP violation in B-0 -> J/psi rho (770)(0) decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Delta phi(s), to the CP-violating phase phi(s) in B-0 -> J/psi phi (1020) decays, yielding Delta phi(s) = 5.0 +/- 4.6 mrad. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. J.; Henderson, R. D. L.; Jelavic, A.; Lane, J. J.; Liu, F. L.; Lobo, I.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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