Measurements of Bþ c Production and Mass with the Bþ c ! J=c  þ Decay

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Title:	Measurements of Bþ c Production and Mass with the Bþ c ! J=c þ Decay
Author:	Calvo Gómez, Míriam; Camboni, Alessandro; Vilasís Cardona, Xavier; LHCb Collaboration - CERN
Other authors:	Universitat Ramon Llull. La Salle; CERN
Abstract:	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.
Publication date:	2012-12-05
Subject (UDC):	53 - Física
Subject(s):	Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear)
Rights:	L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/ © CERN
Pages:	8 p.
Document type:	Article Article - Published version
DOI:	https://doi.org/10.1103/PhysRevLett.109.232001
Published by:	American Physical Society
Publish at:	Physical Review Letters, 2012, Vol. 109, No. 23 (Desembre)
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