An amplitude analysis of B-→J/ψΛp¯ decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4 MeV and 7.0±1.2±1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44±0.05±0.07 MeV, is obtained.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Observation of a J/ψ Λ Resonance Consistent with a Strange Pentaquark Candidate in B- →J/ψ Λ p ¯ Decays. PHYSICAL REVIEW LETTERS, 131(3) [10.1103/PhysRevLett.131.031901].

Observation of a J/ψ Λ Resonance Consistent with a Strange Pentaquark Candidate in B- →J/ψ Λ p ¯ Decays

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

An amplitude analysis of B-→J/ψΛp¯ decays is performed using 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8, and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb-1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4 MeV and 7.0±1.2±1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44±0.05±0.07 MeV, is obtained.
Articolo in rivista - Articolo scientifico
Exotic Hadrons, Hadron Collider, Hadron Spectroscopy
English
2023
131
3
031901
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Observation of a J/ψ Λ Resonance Consistent with a Strange Pentaquark Candidate in B- →J/ψ Λ p ¯ Decays. PHYSICAL REVIEW LETTERS, 131(3) [10.1103/PhysRevLett.131.031901].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/453931
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