A new baryon state is observed in the Λb0π+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±0.2MeV,Γ=72±11±2MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λb0 baryon mass. The new state is consistent with the first radial excitation of the Λb0 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. [Figure not available: see fulltext.]

Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of a new baryon state in the Λb0π+π− mass spectrum. JOURNAL OF HIGH ENERGY PHYSICS, 2020(6) [10.1007/JHEP06(2020)136].

Observation of a new baryon state in the Λb0π+π− mass spectrum

Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinazzoli L.;Martinelli M.;Meloni S.;Petruzzo M.;
2020

Abstract

A new baryon state is observed in the Λb0π+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±0.2MeV,Γ=72±11±2MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Λb0 baryon mass. The new state is consistent with the first radial excitation of the Λb0 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. [Figure not available: see fulltext.]
Articolo in rivista - Articolo scientifico
B physics; Hadron-Hadron scattering (experiments); Heavy quark production; Spectroscopy
English
2020
2020
6
136
none
Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., et al. (2020). Observation of a new baryon state in the Λb0π+π− mass spectrum. JOURNAL OF HIGH ENERGY PHYSICS, 2020(6) [10.1007/JHEP06(2020)136].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/289355
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