%0 Journal Article
%T Observation of the Lambda(0)(b) -> chi(c1) (3872)pK(-) decay
%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 Journal of High Energy Physics
%D 2019
%V 09
%N 9
%I Springer
%@ 1029-8479
%G English
%F LHCbCollaborationAaij_etal2019
%O WOS:000490789700001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4175), last updated on Mon, 28 Oct 2019 10:19:54 +0000
%X Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb(-1) of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Lambda(0)(b) -> chi(c1)(3872)pK(-) with chi(c1)(3872) -> J/psi pi(+)pi(-) is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 +/- 15)% of the decays proceed via the two-body intermediate state chi(c1)(3872)Lambda(1520). The branching fraction with respect to that of the Lambda(0)(b) -> psi(2S)pK(-) decay mode, where the psi(2S) meson is reconstructed in the J/psi pi(+)pi(-) final state, is measured to be: B(Lambda(0)(b) -> chi(c1)(3872)pK(-))/B (Lambda(0)(b) -> psi(2S)pK(-)) x B(chi(c1)(3872) -> J/psi pi(+)pi(-))/B(psi(2S) -> J/psi pi(+)pi(-)) = (5.4 +/- 1.1 +/- 0.2) x 10(-2), where the first uncertainty is statistical and the second is systematic.
%K B physics
%K Branching fraction
%K Exotics
%K Hadron-Hadron scattering (experiments)
%R 10.1007/JHEP09(2019)028
%U https://arxiv.org/abs/1907.00954
%U https://doi.org/10.1007/JHEP09(2019)028
%P 028-20pp