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).
2013
R., Aaij; C., Abellan Beteta; A., Adametz; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2097213
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