The product of the Λ0b (B0) differential production cross-section and the branching fraction of the decay Λ0b → J/ψ pK− (B0 → J/ψ K*(892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT < 20 GeV/c and 2.0 < y < 4.5. The measurements use a data sample corresponding to an integrated luminosity of 3 fb−1 collected by the LHCb detector in pp collisions at centre-of-mass energies √s = 7 TeV in 2011 and √s = 8 TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛ0b /fd, the branching fraction of the decay Λ0b → J/ψ pK− is measured to be B(Λ0b → J/ψ pK−) = (3.17 ± 0.04 ± 0.07 ± 0.34+0−04528) × 10−4, where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B0 → J/ψ K*(892)0, and the fourth is due to the knowledge of fΛ0b /fd. The sum of the asymmetries in the production and decay between Λ0b and Λ0b is also measured as a function of pT and y. The previously published branching fraction of Λ0b → J/ψ pπ−, relative to that of Λ0b → J/ψ pK−, is updated. The branching fractions of Λ0b → Pc+(→ J/ψ p)K− are determined.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2016). Study of the production of Λ0b and B0 hadrons in pp collisions and first measurement of the Λ0b → J/ψpK− branching fraction [Altro] [10.5167/uzh-129681].

Study of the production of Λ0b and B0 hadrons in pp collisions and first measurement of the Λ0b → J/ψpK− branching fraction

Borsato M.;Calvi M.;Carniti P.;Garcia Pardinas J.;Gotti C.;Martinelli M.;Petruzzo M.;
2016

Abstract

The product of the Λ0b (B0) differential production cross-section and the branching fraction of the decay Λ0b → J/ψ pK− (B0 → J/ψ K*(892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT < 20 GeV/c and 2.0 < y < 4.5. The measurements use a data sample corresponding to an integrated luminosity of 3 fb−1 collected by the LHCb detector in pp collisions at centre-of-mass energies √s = 7 TeV in 2011 and √s = 8 TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛ0b /fd, the branching fraction of the decay Λ0b → J/ψ pK− is measured to be B(Λ0b → J/ψ pK−) = (3.17 ± 0.04 ± 0.07 ± 0.34+0−04528) × 10−4, where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B0 → J/ψ K*(892)0, and the fourth is due to the knowledge of fΛ0b /fd. The sum of the asymmetries in the production and decay between Λ0b and Λ0b is also measured as a function of pT and y. The previously published branching fraction of Λ0b → J/ψ pπ−, relative to that of Λ0b → J/ψ pK−, is updated. The branching fractions of Λ0b → Pc+(→ J/ψ p)K− are determined.
Altro
B Physics, Baryons
English
2016
Preprint
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2016). Study of the production of Λ0b and B0 hadrons in pp collisions and first measurement of the Λ0b → J/ψpK− branching fraction [Altro] [10.5167/uzh-129681].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/310192
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