An amplitude analysis of the B+ → Ds+ Ds− K+ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the Ds+ Ds− invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956 ± 5 ± 10 MeV, 43 ± 13 ± 8 MeV, and J^PC = 0^++, respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of c anti-c s anti-s quarks. Evidence for an additional structure is found around 4140 MeV in the Ds+ Ds− invariant mass, which might be caused either by a new resonance with the 0^++ assignment or by a J/ψ ϕ ↔ Ds+ Ds− coupled-channel effect.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of a Resonant Structure near the Ds+ Ds− Threshold in the B+ → Ds+ Ds− K+ Decay. PHYSICAL REVIEW LETTERS, 131(7), 1-12 [10.1103/PhysRevLett.131.071901].

Observation of a Resonant Structure near the Ds+ Ds− Threshold in the B+ → Ds+ Ds− K+ Decay

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

Abstract

An amplitude analysis of the B+ → Ds+ Ds− K+ decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the Ds+ Ds− invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956 ± 5 ± 10 MeV, 43 ± 13 ± 8 MeV, and J^PC = 0^++, respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of c anti-c s anti-s quarks. Evidence for an additional structure is found around 4140 MeV in the Ds+ Ds− invariant mass, which might be caused either by a new resonance with the 0^++ assignment or by a J/ψ ϕ ↔ Ds+ Ds− coupled-channel effect.
2023
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of a Resonant Structure near the Ds+ Ds− Threshold in the B+ → Ds+ Ds− K+ Decay. PHYSICAL REVIEW LETTERS, 131(7), 1-12 [10.1103/PhysRevLett.131.071901].
Aaij, R; Abdelmotteleb, A S W; Abellan Beteta, C; Abudinén, F; Ackernley, T; Adeva, B; Adinolfi, M; Afsharnia, H; Agapopoulou, C; Aidala, C A; Aiola, ...espandi
File in questo prodotto:
File Dimensione Formato  
2023-AR-47-Obs_Resonant_Struct_near_the_Dsp_Dsm_Thresh-PRL-min.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 587.57 kB
Formato Adobe PDF
587.57 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/11585/953161
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 10
social impact