A search for CP violation in charmless three-body Ξb⁻ → pK⁻K⁻ decays is performed using pp collision data recorded with the LHCb detector, corresponding to integrated luminosities of 1 fb⁻¹ at a center-of-mass energy √s = 7 TeV, 2 fb⁻¹ at √s = 8 TeV and 2 fb⁻¹ at √s = 13 TeV. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from Σ(1385), Λ(1405), Λ(1520), Λ(1670), Σ(1775) and Σ(1915) resonances. The model allows for CP violation effects, which are found to be consistent with zero. The branching fractions of Xi⁻(b) → Σ(1385)K⁻, Ξ⁻(b) → Λ(1405)K⁻, Ξ⁻(b) → Λ(1520)K⁻, Ξ⁻(b) → Λ(1670)K-, Ξ⁻(b) → Σ(1775)K- and Ξ⁻(b) → Σ(1915)K⁻ decays arc also reported. In addition, an upper limit is placed on the product of ratios of Ω⁻(b) and Ξ⁻(b) fragmentation fractions and the Ω⁻(b) → pK⁻K⁻ and Ξ⁻(b) → pK⁻K⁻ branching fractions.

Search for CP violation in Ξb⁻ → pK⁻K⁻ decays

Graverini E;Punzi G;
2021-01-01

Abstract

A search for CP violation in charmless three-body Ξb⁻ → pK⁻K⁻ decays is performed using pp collision data recorded with the LHCb detector, corresponding to integrated luminosities of 1 fb⁻¹ at a center-of-mass energy √s = 7 TeV, 2 fb⁻¹ at √s = 8 TeV and 2 fb⁻¹ at √s = 13 TeV. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from Σ(1385), Λ(1405), Λ(1520), Λ(1670), Σ(1775) and Σ(1915) resonances. The model allows for CP violation effects, which are found to be consistent with zero. The branching fractions of Xi⁻(b) → Σ(1385)K⁻, Ξ⁻(b) → Λ(1405)K⁻, Ξ⁻(b) → Λ(1520)K⁻, Ξ⁻(b) → Λ(1670)K-, Ξ⁻(b) → Σ(1775)K- and Ξ⁻(b) → Σ(1915)K⁻ decays arc also reported. In addition, an upper limit is placed on the product of ratios of Ω⁻(b) and Ξ⁻(b) fragmentation fractions and the Ω⁻(b) → pK⁻K⁻ and Ξ⁻(b) → pK⁻K⁻ branching fractions.
2021
Aaij, R; Beteta, Ca; Ackernley, T; Adeva, B; Adinolfi, M; Afsharnia, H; Aidala, Ca; Aiola, S; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexande...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevD.104.052010.pdf

accesso aperto

Tipologia: Versione finale editoriale
Licenza: Creative commons
Dimensione 2.29 MB
Formato Adobe PDF
2.29 MB 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/11568/1210647
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 9
social impact