@Article{LHCbCollaborationAaij_etal2015,
author="LHCb Collaboration (Aaij, R. et al
and Martinez-Vidal, F.
and Oyanguren, A.
and Ruiz Valls, P.
and Sanchez Mayordomo, C.",
title="Measurement of the CP-violating phase beta in B-0 -> J/psi pi(+)pi(-) decays and limits on penguin effects",
journal="Physics Letters B",
year="2015",
publisher="Elsevier Science Bv",
volume="742",
pages="38--49",
abstract="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.",
optnote="WOS:000350555900007",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2154), last updated on Thu, 09 Apr 2015 15:58:08 +0000",
issn="0370-2693",
doi="10.1016/j.physletb.2015.01.008",
opturl="http://arxiv.org/abs/1411.1634",
opturl="https://doi.org/10.1016/j.physletb.2015.01.008",
archivePrefix="arXiv",
eprint="1411.1634",
language="English"
}