Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb^−1, the observation of a new excited Ξb0 resonance decaying to the Ξb− π+ final state is presented. The state, referred to as Ξb(6227)0, has a measured mass and natural width of m(Ξb(6227)0) = 6227.1{−1.5}{+1.4} ± 0.5 MeV and Γ(Ξb(6227)0) = 18.6{−4.1}{+5.0} ± 1.4 MeV, where the uncertainties are statistical and systematic. The production rate of the Ξb(6227)0 state relative to that of the Ξb− baryon in the kinematic region 2 < η < 5 and p_T < 30 GeV is measured to be f_Ξb(6227)0/f_Ξb− B(Ξb(6227)0 → Ξb− π+) = 0.045 ± 0.008 ± 0.004, where B(Ξb(6227)0 → Ξb− π+) is the branching fraction of the decay, and f_Ξb(6227)0 and f_Ξb− represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed Ξb(6227)− state, along with the mass of the Ξb− baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of a New Ξb0 State. PHYSICAL REVIEW D, 103(1), 1-17 [10.1103/PhysRevD.103.012004].

Observation of a New Ξb0 State

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.;
2021

Abstract

Using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 8.5 fb^−1, the observation of a new excited Ξb0 resonance decaying to the Ξb− π+ final state is presented. The state, referred to as Ξb(6227)0, has a measured mass and natural width of m(Ξb(6227)0) = 6227.1{−1.5}{+1.4} ± 0.5 MeV and Γ(Ξb(6227)0) = 18.6{−4.1}{+5.0} ± 1.4 MeV, where the uncertainties are statistical and systematic. The production rate of the Ξb(6227)0 state relative to that of the Ξb− baryon in the kinematic region 2 < η < 5 and p_T < 30 GeV is measured to be f_Ξb(6227)0/f_Ξb− B(Ξb(6227)0 → Ξb− π+) = 0.045 ± 0.008 ± 0.004, where B(Ξb(6227)0 → Ξb− π+) is the branching fraction of the decay, and f_Ξb(6227)0 and f_Ξb− represent fragmentation fractions. Improved measurements of the mass and natural width of the previously observed Ξb(6227)− state, along with the mass of the Ξb− baryon, are also reported. Both measurements are significantly more precise than, and consistent with, previously reported values.
2021
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2021). Observation of a New Ξb0 State. PHYSICAL REVIEW D, 103(1), 1-17 [10.1103/PhysRevD.103.012004].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/848614
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