%0 Journal Article
%T First observation of the decay Lambda(0)(b) -> eta(c) (1S)pK(-)
%A LHCb Collaboration (Aaij, R. et al
%A Garcia Martin, L. M.
%A Henry, L.
%A Jashal, B. K.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Vidal, J.
%A Sanchez Mayordomo, C.
%J Physical Review D
%D 2020
%V 102
%N 11
%I Amer Physical Soc
%@ 2470-0010
%G English
%F LHCbCollaborationAaij_etal2020
%O WOS:000600840000002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4660), last updated on Wed, 13 Jan 2021 08:55:52 +0000
%X The decay Lambda(0)(b) -> eta(c) (1S)pK(- )is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb I, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Lambda(0)(b) -> J/psi pK(-) decay as a normalization mode, to be B(Lambda(0)(b) -> eta(c) (1S)pK(-)) = (1.06 +/- 0.16 +/- 0.06(-019)(+0.22)) x 10(-4), where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the eta(c)(1S)p mass spectrum is performed to search for the P-c(4312)(+) pentaquark state. No evidence is B(Lambda(0)(b) -> P-c(4312)K-+(-))xB(P-c(4312)(+)-> eta(c)(1S)p)/B(Lambda(0)(b) -> eta(c) (1S)pK(-)) < 0.24( ) observed and an upper limit of < 0.24 is obtained at the 95% confidence level.
%R 10.1103/PhysRevD.102.112012
%U https://arxiv.org/abs/2007.11292
%U https://doi.org/10.1103/PhysRevD.102.112012
%P 112012-12pp