2026-04-13T07:16:24Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc LHCb Collaboration author Calvo Gomez, M. author Camboni, Alessandro author Coquereau, Samuel author Garrido Beltrán, Lluís author Gascón Fora, David author Gironella Gironell, P. author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Marin Benito, Carla author Picatoste Olloqui, Eduardo author Vazquez Gomez, R. author 2022-06-13T14:47:44Z 2022-06-13T14:47:44Z 2017 2022-06-13T14:47:44Z 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. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments Amplitude analysis of B+ →j /ψφK+ decays