Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/132917
Title: Observation of two new Ξb- Baryon resonances
Author: Badalov, Alexey
Calvo Gómez, Míriam
Casanova Mohr, Raimon
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 10-Feb-2015
Publisher: American Physical Society
Abstract: Two structures are observed close to the kinematic threshold in the Ξ 0 b π − mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0     fb − 1 , recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content b d s are expected in this mass region: the spin-parity J P = ( 1 / 2 ) + and J P = ( 3 / 2 ) + states, denoted Ξ ' − b and Ξ * − b . Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m ( Ξ ' − b ) − m ( Ξ 0 b ) − m ( π − ) = 3.653 ± 0.018 ± 0.006     MeV / c 2 , m ( Ξ * − b ) − m ( Ξ 0 b ) − m ( π − ) = 23.96 ± 0.12 ± 0.06     MeV / c 2 , Γ ( Ξ * − b ) = 1.65 ± 0.31 ± 0.10     MeV , where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ ( Ξ ' − b ) < 0.08     MeV at 95% confidence level. Relative production rates of these states are also reported.
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.114.062004
It is part of: Physical Review Letters, 2015, vol. 114, num. 6, p. 062004
URI: http://hdl.handle.net/2445/132917
Related resource: https://doi.org/10.1103/PhysRevLett.114.062004
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Electrònica)
Articles publicats en revistes (Física Quàntica i Astrofísica)

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