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Title: | Observation of the Resonant Character of the Z(4430)− State |
Author: | Badalov, Alexey Calvo Gómez, Míriam Camboni, Alessandro 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: | 4-Jun-2014 |
Publisher: | American Physical Society |
Abstract: | Resonant structures in B 0 → ψ ′ π − K + decays are analyzed by performing a four-dimensional fit of the decay amplitude, using p p collision data corresponding to 3 fb − 1 collected with the LHCb detector. The data cannot be described with K + π − resonances alone, which is confirmed with a model-independent approach. A highly significant Z ( 4430 ) − → ψ ′ π − component is required, thus confirming the existence of this state. The observed evolution of the Z ( 4430 ) − amplitude with the ψ ′ π − mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1 + . |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.112.222002 |
It is part of: | Physical Review Letters, 2014, vol. 112, num. 22, p. 222002 |
URI: | http://hdl.handle.net/2445/133080 |
Related resource: | https://doi.org/10.1103/PhysRevLett.112.222002 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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