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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
Particle physics
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:
It is part of: Physical Review Letters, 2014, vol. 112, num. 22, p. 222002
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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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