TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Ruiz Valls, P.
AU  - Sanchez Mayordomo, C.
PY  - 2015
DA  - 2015//
TI  - Measurement of the CP-violating phase beta in B-0 -> J/psi pi(+)pi(-) decays and limits on penguin effects
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 38
EP  - 49
VL  - 742
PB  - Elsevier Science Bv
AB  - Time-dependent CP violation is measured in the (B-0) over bar -> J/psi pi(+)pi(-) p-channel for each pi(+)pi(-) resonant final state using data collected with an integrated luminosity of 3.0 fb(-1) in pp collisions using the LHCb detector. The final state with the largest rate, J/psi rho(0)(770), is used to measure the CP-violating angle 2 beta(eff) to be (41.7 +/- 9.6(-6.3)(+2.8)).. This result can be used to limit the size of penguin amplitude contributions to CPviolation measurements in, for example, (B-0) over bar -> J/psi pi(+)pi(-) decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase phi(s) limited to be within the interval [-1.05 degrees, + 1.18 degrees] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1411.1634
UR  - https://doi.org/10.1016/j.physletb.2015.01.008
DO  - 10.1016/j.physletb.2015.01.008
LA  - English
N1  - WOS:000350555900007
ID  - LHCbCollaborationAaij_etal2015
ER  -