2026-04-17T02:04:29Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1854972025-12-05T16:43:57Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Alfonso Albero, Alejandro author Calvo Gomez, M. author Camboni, Alessandro author Coquereau, Samuel author Garrido Beltrán, Lluís author Gascon, D. author Gironella Gironell, P. author Graciani Díazaz, Ricardo author Graugés Pous, Eugeni author Vazquez Gomez, R. author Marin Benito, Carla author LHCb Collaboration author 2022-05-10T15:41:36Z 2022-05-10T15:41:36Z 2018 2022-05-10T15:41:36Z The first observation of the B0 s → D¯ 0KþK− decay is reported, together with the most precise branching fraction measurement of the mode B0 → D¯ 0KþK−. The results are obtained from an analysis of pp collision data corresponding to an integrated luminosity of 3.0 fb−1. The data were collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV. The branching fraction of the B0 → D¯ 0KþK− decay is measured relative to that of the decay B0 → D¯ 0πþπ− to be BðB0→D¯ 0KþK−Þ BðB0→D¯ 0πþπ−Þ ¼ ð6.9 0.4 0.3Þ%, where the first uncertainty is statistical and the second is systematic. The measured branching fraction of the B0 s → D¯ 0KþK− decay mode relative to that of the corresponding B0 decay is BðB0 s→D¯ 0KþK−Þ BðB0→D¯ 0KþK−Þ ¼ ð93.0 8.9 6.9Þ%. Using the known branching fraction of B0 → D¯ 0πþπ−, the values of BðB0 →D¯ 0KþK−Þ¼ð6.10.40.30.3Þ×10−5 and BðB0 s →D¯ 0KþK−Þ¼ð5.70.50.40.5Þ×10−5 are obtained, where the third uncertainties arise from the branching fraction of the decay modes B0 → D¯ 0πþπ− and B0 → D¯ 0KþK−, respectively. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments Observation of the decay Bs0→D¯0K+K−