The observation of the decay Ξb− → J /ψ Λ K − is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξ− baryons detected in the decay Ξ− → J/ψΛK− is measured bb relative to that of Λb0 baryons using the decay Λb0 → J/ψΛ. Integrated over the b-baryon transverse momentum pT < 25 GeV/c and rapidity 2.0 < y < 4.5, the measured ratio is fΞb− B(Ξb− → J/ψΛK−) =(4.19±0.29(stat)±0.15(syst))×10−2, fΛb0 B(Λb0 → J/ψΛ) where f Ξb− and f Λb0 are the fragmentation fractions of b → Ξb− and b → Λb0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb− and Λb0 baryons is measured to be M ( Ξ b− ) − M ( Λ b0 ) = 1 7 7 . 0 8 ± 0 . 4 7 ( s t a t ) ± 0 . 1 6 ( s y s t ) M e V / c 2 .

Observation of the Ξ<inf>b</inf>−→J/ψΛK−decay / Aaij, R., Adeva, B., Adinolfi, M., 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., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 772:(2017), pp. 265-273. [10.1016/j.physletb.2017.06.045]

Observation of the Ξb−→J/ψΛK−decay

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2017

Abstract

The observation of the decay Ξb− → J /ψ Λ K − is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξ− baryons detected in the decay Ξ− → J/ψΛK− is measured bb relative to that of Λb0 baryons using the decay Λb0 → J/ψΛ. Integrated over the b-baryon transverse momentum pT < 25 GeV/c and rapidity 2.0 < y < 4.5, the measured ratio is fΞb− B(Ξb− → J/ψΛK−) =(4.19±0.29(stat)±0.15(syst))×10−2, fΛb0 B(Λb0 → J/ψΛ) where f Ξb− and f Λb0 are the fragmentation fractions of b → Ξb− and b → Λb0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb− and Λb0 baryons is measured to be M ( Ξ b− ) − M ( Λ b0 ) = 1 7 7 . 0 8 ± 0 . 4 7 ( s t a t ) ± 0 . 1 6 ( s y s t ) M e V / c 2 .
2017
Charm physics; CP violation; Flavor physics; Hadron-Hadron Scattering; Nuclear and High Energy Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the Ξ<inf>b</inf>−→J/ψΛK−decay / Aaij, R., Adeva, B., Adinolfi, M., 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., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 772:(2017), pp. 265-273. [10.1016/j.physletb.2017.06.045]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074636
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