The relative production rate of B0s and B0 mesons is determined with the hadronic decays B0s→D−sπ+ and B0→D−K+. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass energy of s√=7 TeV recorded in the forward region with the LHCb experiment. The ratio of production rates, fs/fd, is measured to be 0.238±0.004±0.015±0.021, where the first uncertainty is statistical, the second systematic, and the third theoretical. This is combined with a previous LHCb measurement to obtain fs/fd=0.256±0.020. The dependence of fs/fd on the transverse momentum and pseudorapidity of the B meson is determined using the decays B0s→D−sπ+ and B0→D−π+. There is evidence for a decrease with increasing transverse momentum, whereas the ratio remains constant as a function of pseudorapidity. In addition, the ratio of branching fractions of the decays B0→D−K+ and B0→D−π+ is measured to be 0.0822±0.0011(stat)±0.0025(syst).
Measurement of the fragmentation fraction ratio f s /f d and its dependence on B meson kinematics
BALDINI, Wander;BOZZI, Concezio;SAVRIE', Mauro;
2013
Abstract
The relative production rate of B0s and B0 mesons is determined with the hadronic decays B0s→D−sπ+ and B0→D−K+. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass energy of s√=7 TeV recorded in the forward region with the LHCb experiment. The ratio of production rates, fs/fd, is measured to be 0.238±0.004±0.015±0.021, where the first uncertainty is statistical, the second systematic, and the third theoretical. This is combined with a previous LHCb measurement to obtain fs/fd=0.256±0.020. The dependence of fs/fd on the transverse momentum and pseudorapidity of the B meson is determined using the decays B0s→D−sπ+ and B0→D−π+. There is evidence for a decrease with increasing transverse momentum, whereas the ratio remains constant as a function of pseudorapidity. In addition, the ratio of branching fractions of the decays B0→D−K+ and B0→D−π+ is measured to be 0.0822±0.0011(stat)±0.0025(syst).I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.