A new baryon state is observed in the Λ0b π+ π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies √s = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The mass and natural width of the new state are measured to be m = 6072.3 ± 2.9 ± 0.6 ± 0.2 MeV, Γ = 72 ± 11 ± 2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported.

Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of a New Baryon State in the Λ0b π+ π− Mass Spectrum. JOURNAL OF HIGH ENERGY PHYSICS, 2020(6), 0-25 [10.1007/JHEP06(2020)136].

Observation of a New Baryon State in the Λ0b π+ π− Mass Spectrum

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Maccolini, S.;Manuzzi, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Zucchelli, S.
2020

Abstract

A new baryon state is observed in the Λ0b π+ π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies √s = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb^−1. The mass and natural width of the new state are measured to be m = 6072.3 ± 2.9 ± 0.6 ± 0.2 MeV, Γ = 72 ± 11 ± 2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λ0b baryon mass. The new state is consistent with the first radial excitation of the Λ0b baryon, the Λb(2S)0 resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Λb(5912)0 and Λb(5920)0 states are also reported.
2020
Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of a New Baryon State in the Λ0b π+ π− Mass Spectrum. JOURNAL OF HIGH ENERGY PHYSICS, 2020(6), 0-25 [10.1007/JHEP06(2020)136].
Aaij, R.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/772392
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