@Article{LHCbCollaborationAaij_etal2019,
author="LHCb Collaboration (Aaij, R. et al
and Garcia Martin, L. M.
and Henry, L.
and Jashal, B. K.
and Martinez-Vidal, F.
and Oyanguren, A.
and Remon Alepuz, C.
and Ruiz Vidal, J.
and Sanchez Mayordomo, C.",
title="Observation of the Lambda(0)(b) -> chi(c1) (3872)pK(-) decay",
journal="Journal of High Energy Physics",
year="2019",
publisher="Springer",
volume="09",
number="9",
pages="028--20pp",
optkeywords="B physics; Branching fraction; Exotics; Hadron-Hadron scattering (experiments)",
abstract="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.",
optnote="WOS:000490789700001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4175), last updated on Mon, 28 Oct 2019 10:19:54 +0000",
issn="1029-8479",
doi="10.1007/JHEP09(2019)028",
opturl="https://arxiv.org/abs/1907.00954",
opturl="https://doi.org/10.1007/JHEP09(2019)028",
language="English"
}