%0 Journal Article
%T Observation of the Lambda(0)(b) -> J / psi p pi(-) decay
%A LHCb Collaboration (Aaij, R. et al
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Ruiz Valls, P.
%A Sanchez Mayordomo, C.
%J Journal of High Energy Physics
%D 2014
%V 07
%N 7
%I Springer
%@ 1029-8479
%G English
%F LHCbCollaborationAaij_etal2014
%O WOS:000346567700001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2058), last updated on Thu, 15 Jan 2015 11:50:41 +0000
%X The first observation of the Cabibbo-suppressed decay Lambda(0)(b) -> J / psi p pi(-) is reported using a data sample of proton-proton collisions at 7 and 8TeV, corresponding to an integrated luminosity of 3 fb(-1). A prominent signal is observed and the branching fraction relative to the decay mode Lambda(0)(b) -> J / psi pK(-) is determined to be B(Lambda(0)(b) -> J / psi p pi(-))/ B(Lambda(0)(b) -> J / psi pK(-)) = 0.0824 +/- 0.0025 (stat) +/- 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be ACP(Lambda(0)(b) -> J / psi p pi(-))/ A(CP)(Lambda(0)(b) -> J / psi pK(-)) = (+5.7 +/- 2.4 (stat) +/- 1.2 (syst))%, which is compatible with CP symmetry at the 2.2 sigma level.
%K B physics
%K CP violation
%K Branching fraction
%K Flavor physics
%K Hadron-Hadron Scattering
%R 10.1007/JHEP07(2014)103
%U http://arxiv.org/abs/1406.0755
%U https://doi.org/10.1007/JHEP07(2014)103
%P 103-19pp