An amplitude analysis of B− → J/ψ Λ anti-p 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/ψ Λ 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.S.W., Abellan Beteta, C., Abudinén, 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 anti-p Decays. PHYSICAL REVIEW LETTERS, 131(3), 1-11 [10.1103/PhysRevLett.131.031901].

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

Carbone, A;Ferrari, F;Galli, D;Manuzzi, D;Patrignani, C;Spedicato, E;Villa, A;Zucchelli, S;
2023

Abstract

An amplitude analysis of B− → J/ψ Λ anti-p 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/ψ Λ 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.
2023
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, 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 anti-p Decays. PHYSICAL REVIEW LETTERS, 131(3), 1-11 [10.1103/PhysRevLett.131.031901].
Aaij, R; Abdelmotteleb, A S W; Abellan Beteta, C; Abudinén, F; Ackernley, T; Adeva, B; Adinolfi, M; Adlarson, P; Afsharnia, H; Agapopoulou, C; Aidala,...espandi
File in questo prodotto:
File Dimensione Formato  
2023-AR-19-Obs_Jpsi_Lambda_Res_Consist_with_Strange_Pentaquark-PRL-min.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 546.43 kB
Formato Adobe PDF
546.43 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952274
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 21
social impact