The first observation of the Ω − b → Ξ + c K − π − decay is reported using p p collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 9     fb − 1 . Four excited Ω 0 c baryons are observed in the Ξ + c K − mass projection of the Ω − b → Ξ + c K − π − decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt p p and e + e − production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of Ω − b → Ξ + c K − π − is measured relative to the Ω − b → Ω 0 c π − decay mode and a precise measurement of the Ω − b mass of 6044.3 ± 1.2 ± 1. 1 + 0.19 − 0.22     MeV is obtained.

Observation of excited baryons in decays / Aaij, R., Beteta, C.Abell??n., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.???A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 104:9(2021). [10.1103/physrevd.104.l091102]

Observation of excited baryons in decays

G. Casse;A. Sarti;
2021

Abstract

The first observation of the Ω − b → Ξ + c K − π − decay is reported using p p collision data at center of mass energies of 7, 8, and 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 9     fb − 1 . Four excited Ω 0 c baryons are observed in the Ξ + c K − mass projection of the Ω − b → Ξ + c K − π − decays with the significance of each exceeding five standard deviations. They coincide with the states previously observed in prompt p p and e + e − production. Relative production rates, masses, and natural widths of the states are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of Ω − b → Ξ + c K − π − is measured relative to the Ω − b → Ω 0 c π − decay mode and a precise measurement of the Ω − b mass of 6044.3 ± 1.2 ± 1. 1 + 0.19 − 0.22     MeV is obtained.
2021
B physics, Branching fraction, Flavor physics, Hadron-Hadron scattering (experiments)
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of excited baryons in decays / Aaij, R., Beteta, C.Abell??n., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.???A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 104:9(2021). [10.1103/physrevd.104.l091102]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1673371
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