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Determination of the X(3872) Meson Quantum Numbers

By Carlos Abellan Beteta, Míriam Calvo Gómez, Alessandro Camboni, Albert Comerma Montells, M. de Oyanguren Campos, Lluís Garrido Beltrán, Ricardo Graciani Díaz, Eugeni Graugés Pous, Elias López Asamar, Antonio Pérez-Calero Yzquierdo, Eduardo Picatoste Olloqui, Cédric Potterat, Vicente José Rives Molina, Hugo (Ruiz Pérez) Ruiz, Pablo Ruiz Valls, Ricard Vázquez Gómez, Xavier Vilasis-Cardona and LHCb Collaboration


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

Topics: Física de partícules, Experiments, Particle physics, Experiments
Publisher: American Physical Society
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Provided by: RECERCAT
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