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oai:recercat.cat:20.500.14342/32762025-03-11T04:11:15Zcom_2072_482405com_2072_183628col_2072_482415

00925njm 22002777a 4500 dc Calvo Gómez, Míriam author Camboni, Alessandro author Vilasís Cardona, Xavier author LHCb Collaboration - CERN author 2012-12-05 Measurements of B+c production and mass are performed with the decay mode B+c→J/ψπ+ using 0.37  fb−1 of data collected in pp collisions at √s=7  TeV by the LHCb experiment. The ratio of the production cross section times branching fraction between the B+c→J/ψπ+ and the B+→J/ψK+ decays is measured to be (0.68±0.10(stat)±0.03(syst)±0.05(lifetime))% for B+c and B+ mesons with transverse momenta pT>4  GeV/c and pseudorapidities 2.5<η<4.5. The B+c mass is directly measured to be 6273.7±1.3(stat)±1.6(syst)  MeV/c2, and the measured mass difference with respect to the B+ meson is M(B+c)−M(B+)=994.6±1.3(stat)±0.6(syst)  MeV/c2. http://hdl.handle.net/20.500.14342/3276 https://doi.org/10.1103/PhysRevLett.109.232001 Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) Measurements of Bþ c Production and Mass with the Bþ c ! J=c þ Decay