2026-04-13T04:51:06Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1317862025-12-04T21:31:19Zcom_2072_1057col_2072_478812col_2072_478823col_2072_478904col_2072_478917

RECERCAT author Abellan Beteta, Carlos author Calvo Gómez, Míriam author Camboni, Alessandro author Comerma Montells, Albert author Domingo Bonal, Francesc author Garrido Beltrán, Lluís author Gascón Fora, David author Grabalosa Gándara, Marc author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author López Asamar, Elias author Pérez-Calero Yzquierdo, Antonio author Picatoste Olloqui, Eduardo author Pie Valls, B. (Blai) author Potterat, Cédric author Puig Navarro, Albert author Roselló, M. author Ruiz, Hugo (Ruiz Pérez) author Vázquez Gómez, Ricard author Vilasis-Cardona, Xavier author LHCb Collaboration 2019-04-08T11:44:44Z2019-04-08T11:44:44Z2012-10-012019-04-08T11:44:44Z A sample of 114 ± 11 B 0 s → J / ψ K − π + signal events obtained with 0.37 fb − 1 of p p collisions at √ s = 7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B 0 s → J / ψ ¯¯¯¯ K * 0 decay, with ¯¯¯¯ K * 0 → K − π + . The K − π + mass spectrum of the candidates in the B 0 s peak is dominated by the ¯¯¯¯ K * 0 contribution. Subtracting the nonresonant K − π + component, the branching fraction of B 0 s → J / ψ ¯¯¯¯ K * 0 is ( 4.4 + 0.5 − 0.4 ± 0.8 ) × 10 − 5 , where the first uncertainty is statistical and the second is systematic. A fit to the angular distribution of the decay products yields the K * 0 polarization fractions f L = 0.50 ± 0.08 ± 0.02 and f ∥ = 0.19 + 0.10 − 0.08 ± 0.02 . cc by (c) CERN; LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Física de partícules Experiments Particle physics Experiments Measurement of the B0s→J/ψ¯¯¯¯K*0 branching fraction and angular amplitudes info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion