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oai:recercat.cat:2445/1865632025-11-21T05:49:24Zcom_2072_1057col_2072_478823col_2072_478917

Amplitude analysis of B+ →j /ψφK+ decays LHCb Collaboration Calvo Gomez, M. Camboni, Alessandro Coquereau, Samuel Garrido Beltrán, Lluís Gascón Fora, David Gironella Gironell, P. Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Vazquez Gomez, R. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments The first full amplitude analysis of B+ → J/ψφK+ with J/ψ → µ +µ −, φ → K+K− decays is performed with a data sample of 3 fb−1 of pp collision data collected at √ s = 7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into φK+, and four J/ψφ structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state. The model includes significant contributions from a number of expected kaon excitations, including the first observation of the K∗ (1680)+ → φK+ transition. 2022-06-13T14:47:44Z 2022-06-13T14:47:44Z 2017 2022-06-13T14:47:44Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.95.012002 Physical Review D, 2017, vol. 2021, p. 1-64 https://doi.org/10.1103/PhysRevD.95.012002 (c) American Physical Society, 2017 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)