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.

Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Aidala, C., et al. (2019). Observation of the Λb0→χc1 (3872) pK− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2019(9) [10.1007/JHEP09(2019)028].

Observation of the Λb0→χc1 (3872) pK− decay

Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinazzoli L.;Martinelli M.;Meloni S.;Petruzzo M.;
2019

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.
Articolo in rivista - Articolo scientifico
B physics; Branching fraction; Exotics; Hadron-Hadron scattering (experiments); LHCb; LHC Collider; Flavour Physics; Particle Physics
English
2019
2019
9
28
open
Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Aidala, C., et al. (2019). Observation of the Λb0→χc1 (3872) pK− decay. JOURNAL OF HIGH ENERGY PHYSICS, 2019(9) [10.1007/JHEP09(2019)028].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/248014
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