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oai:recercat.cat:20.500.14342/32752026-01-21T02:52:03Zcom_2072_482405com_2072_183628col_2072_482415

Determination of fs/fd for 7 TeV pp Collisions and Measurement of the B0→D−K+ Branching Fraction Calvo Gomez, Miriam Camboni, Alessandro Vilasis-Cardona, Xavier LHCb Collaboration - CERN Universitat Ramon Llull. La Salle CERN Gran col·lisionador d'hadrons (França i Suïssa) Partícules (Física nuclear) Col·lisions (Física nuclear) 53 The relative abundance of the three decay modes B0→D−K+, B0→D−π+, and B0s→D−sπ+ produced in 7 TeV pp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35  pb−1. The branching fraction of B0→D−K+ is found to be B(B0→D−K+)=(2.01±0.18stat±0.14syst)×10−4. The ratio of fragmentation fractions fs/fd is determined through the relative abundance of B0s→D−sπ+ to B0→D−K+ and B0→D−π+, leading to fs/fd=0.253±0.017±0.017±0.020, where the uncertainties are statistical, systematic, and theoretical, respectively. 2011-11-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.14342/3275 https://doi.org/10.1103/PhysRevLett.107.211801 eng Physical Review Letters, 2011, Vol. 107, No. 21 (Novembre) Attribution 4.0 International © CERN http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 8 p. American Physical Society