From samples of pp collision data collected by the LHCb experiment at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb^−1, respectively, a peak in both the Λ0b K− and Ξ0b π− invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξb− resonances with quark content bds are expected. Referring to this peak as Ξb(6227)−, the mass and natural width are measured to be m_{Ξb(6227)−} = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c^2 and Γ_{Ξb(6227)−} = 18.1 ± 5.4 ± 1.8 MeV/c^2, where the first uncertainty is statistical, the second is systematic, and the third, on m_{Ξb(6227)−}, is due to the knowledge of the Λ0b baryon mass. Relative production rates of the Ξb(6227)− → Λ0b K− and Ξb(6227)− → Ξ0b π− decays are also reported.

Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of a New Ξb− Resonance. PHYSICAL REVIEW LETTERS, 121(7), 1-12 [10.1103/PhysRevLett.121.072002].

Observation of a New Ξb− Resonance

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Marconi, U.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

From samples of pp collision data collected by the LHCb experiment at √s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb^−1, respectively, a peak in both the Λ0b K− and Ξ0b π− invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξb− resonances with quark content bds are expected. Referring to this peak as Ξb(6227)−, the mass and natural width are measured to be m_{Ξb(6227)−} = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c^2 and Γ_{Ξb(6227)−} = 18.1 ± 5.4 ± 1.8 MeV/c^2, where the first uncertainty is statistical, the second is systematic, and the third, on m_{Ξb(6227)−}, is due to the knowledge of the Λ0b baryon mass. Relative production rates of the Ξb(6227)− → Λ0b K− and Ξb(6227)− → Ξ0b π− decays are also reported.
2018
Aaij, R., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., Akar, S., et al. (2018). Observation of a New Ξb− Resonance. PHYSICAL REVIEW LETTERS, 121(7), 1-12 [10.1103/PhysRevLett.121.072002].
Aaij, R.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/640701
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