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Title: Determination of the X(3872) Meson Quantum Numbers
Author: Abellan Beteta, Carlos
Calvo Gómez, Míriam
Camboni, Alessandro
Comerma Montells, Albert
Oyanguren Campos, M. de
Garrido Beltrán, Lluís
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
López Asamar, Elias
Pérez-Calero Yzquierdo, Antonio
Picatoste Olloqui, Eduardo
Potterat, Cédric
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Ruiz Valls, Pablo
Vázquez Gómez, Ricard
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 29-May-2013
Publisher: American Physical Society
Abstract: The quantum numbers of the X ( 3872 ) meson are determined to be J P C = 1 ++ based on angular correlations in B + → X ( 3872 ) K + decays, where X ( 3872 ) → π + π − J / ψ and J / ψ → μ + μ − . The data correspond to 1.0     fb − 1 of p p collisions collected by the LHCb detector. The only alternative assignment allowed by previous measurements J P C = 2 − + is rejected with a confidence level equivalent to more than 8 Gaussian standard deviations using a likelihood-ratio test in the full angular phase space. This result favors exotic explanations of the X ( 3872 ) state.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2013, vol. 110, num. 22, p. 222001
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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