2026-04-13T06:45:57Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1318332025-12-05T16:50:11Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Camboni, Alessandro author Comerma Montells, Albert author Garrido Beltrán, Lluís author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author López Asamar, Elias author Pérez-Calero Yzquierdo, Antonio author Picatoste Olloqui, Eduardo author Potterat, Cédric author Rives Molina, Vicente José author Ruiz, Hugo (Ruiz Pérez) author Vázquez Gómez, Ricard author Abellan Beteta, Carlos author Calvo Gómez, Míriam author Vilasis-Cardona, Xavier author Domingo Bonal, Francesc author LHCb Collaboration author 2019-04-08T13:40:17Z 2019-04-08T13:40:17Z 2013-04-01 2019-04-08T13:40:17Z An amplitude analysis of the final state structure in the ¯¯¯ B 0 s → J / ψ K + K − decay mode is performed using 1.0     fb − 1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy p p collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K + K − mass spectrum as well as a significant nonresonant S -wave contribution over the entire K + K − mass range. The largest resonant component is the ϕ ( 1020 ) , accompanied by f 0 ( 980 ) , f ′ 2 ( 1525 ) , and four additional resonances. The overall branching fraction is measured to be B ( ¯¯¯ B 0 s → J / ψ K + K − ) = ( 7.70 ± 0.08 ± 0.39 ± 0.60 ) × 10 − 4 , where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of ¯¯¯ B 0 s to B − mesons produced. The mass and width of the f ′ 2 ( 1525 ) are measured to be 1522.2 ± 2.8 + 5.3 − 2.0     MeV and 84 ± 6 + 10 − 5     MeV , respectively. The final state fractions of the other resonant states are also reported. Física de partícules Experiments Particle physics Experiments Amplitude analysis and branching fraction measurement of B¯s0→J/ψK+K-