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Title: | Observation of the Ξb- → J / ψΛK- decay |
Author: | Camboni, Alessandro Coquereau, S. Garrido Beltrán, Lluís Gascon, D. Graciani Diaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, E. Rives Molina, V. |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | Sep-2017 |
Publisher: | Elsevier B.V. |
Abstract: | The observation of the decay Xi(-)(b)-> J/psi Lambda K- is reported, using a data sample corresponding to an integrated luminosity of 3 fb(-1), collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8 TeV. The production rate of Xi(-)(b) baryons detected in the decay Xi(-)(b) -> J/psi Lambda K- is measured relative to that of Lambda(0)(b) baryons using the decay Lambda(0)(b) -> J/psi Lambda. Integrated over the b-baryon transverse momentum p(T) < 25 GeV/c and rapidity 2.0 < y < 4.5, the measured ratio is f Xi(-)(b/) f Lambda(0)(b) B(Xi(-)(b)-> J/psi Lambda K-) / B(Lambda(0)(b)-> J/psi Lambda) = (4.19 +/- 0.29 (stat) +/- 0.15 (syst)) x 10(-2), where f(Xi)(b)(-) band f(Lambda)(b)(0)are the fragmentation fractions of b ->Xi(-)(b)and b ->Lambda(0)(b)transitions, and ss represents the branching fraction of the corresponding b- baryon decay. The mass difference between Xi(-)(b) and Lambda(0)(b) baryons is measured to be M(Xi(-)(b))-M(Lambda(0)(b)) = 177.08 +/- 0.47 (stat) +/- 0.16 (syst) MeV/c(2). |
Note: | Reproducció del document publicat a: https://doi.org/10.1016/j.physletb.2017.06.045 |
It is part of: | Physics Letters B, 2017, vol. 772, p. 265-273 |
URI: | http://hdl.handle.net/2445/186440 |
Related resource: | https://doi.org/10.1016/j.physletb.2017.06.045 |
ISSN: | 0370-2693 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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