The product of the Λ0b (B0) differential production cross-section and the branching fraction of the decayΛ0b →J/ψpK− (B0 →J/ψK∗(892)0) is measured as a function of the beauty hadron transverse momentum, pT , andrapidity, y. The kinematic region of the measurements is pT < 20 GeV/c and 2.0 < y < 4.5. The measurements usea data sample corresponding to an integrated luminosity of 3fb−1collected by the LHCb detector in pp collisionsat centre-of-mass energies √s = 7 TeV in 2011 and √s = 8 TeV in 2012. Based on previous LHCb results of thefragmentation fraction ratio, fΛ0b/fd, the branching fraction of the decay Λ0b→J/ψpK− is measured to beB(Λ0b→J/ψpK−)=(3.17±0.04±0.07±0.34+0.45−0.28 )×10−4,where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branchingfraction of the decay B0→J/ψK∗(892)0, and the fourth is due to the knowledge of fΛ0b/fd. The sum of the asymmetriesin the production and decay between Λ0b and Λ0b is also measured as a function of pTand y. The previously publishedbranching fraction of Λ0b → J/ψ pπ−, relative to that of Λ0b → J/ψpK−, is updated. The branching fractions ofΛ0b→P+c (→J/ψp)K− are determined.

Study of the production of A0<inf>b</inf>and B0hadrons in pp collisions and first measurement of the ∧o<inf>b</inf>→J/ΨpK branching fraction / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassi, G., et al.. - In: CHINESE PHYSICS C. - ISSN 1674-1137. - 40:1(2016). [10.1088/1674-1137/40/1/011001]

Study of the production of A0band B0hadrons in pp collisions and first measurement of the ∧ob→J/ΨpK branching fraction

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2016

Abstract

The product of the Λ0b (B0) differential production cross-section and the branching fraction of the decayΛ0b →J/ψpK− (B0 →J/ψK∗(892)0) is measured as a function of the beauty hadron transverse momentum, pT , andrapidity, y. The kinematic region of the measurements is pT < 20 GeV/c and 2.0 < y < 4.5. The measurements usea data sample corresponding to an integrated luminosity of 3fb−1collected by the LHCb detector in pp collisionsat centre-of-mass energies √s = 7 TeV in 2011 and √s = 8 TeV in 2012. Based on previous LHCb results of thefragmentation fraction ratio, fΛ0b/fd, the branching fraction of the decay Λ0b→J/ψpK− is measured to beB(Λ0b→J/ψpK−)=(3.17±0.04±0.07±0.34+0.45−0.28 )×10−4,where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branchingfraction of the decay B0→J/ψK∗(892)0, and the fourth is due to the knowledge of fΛ0b/fd. The sum of the asymmetriesin the production and decay between Λ0b and Λ0b is also measured as a function of pTand y. The previously publishedbranching fraction of Λ0b → J/ψ pπ−, relative to that of Λ0b → J/ψpK−, is updated. The branching fractions ofΛ0b→P+c (→J/ψp)K− are determined.
2016
production cross-section, branching fraction, b hadrons, proton-proton collisions
01 Pubblicazione su rivista::01a Articolo in rivista
Study of the production of A0<inf>b</inf>and B0hadrons in pp collisions and first measurement of the ∧o<inf>b</inf>→J/ΨpK branching fraction / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassi, G., et al.. - In: CHINESE PHYSICS C. - ISSN 1674-1137. - 40:1(2016). [10.1088/1674-1137/40/1/011001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074091
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