Study of Λ b 0 and Ξ b 0 Decays to Λ h + h ′ − and Evidence for C P Violation in Λ b 0 → Λ K + K − Decays

Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoulou, C.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Aliouche, Z.; Alvarez Cartelle, P.; Amalric, R.; Amato, S.; Amey, J. L.; Amhis, Y.; An, L.; Anderlini, L.; Andersson, M.; Andreianov, A.; Andreola, P.; Andreotti, M.; Andreou, D.; Anelli, A.; Ao, D.; Archilli, F.; Argenton, M.; Arguedas Cuendis, S.; Artamonov, A.; Artuso, M.; Aslanides, E.; Ataíde Da Silva, R.; Atzeni, M.; Audurier, B.; Bacher, D.; Bachiller Perea, I.; Bachmann, S.; Bachmayer, M.; Back, J. J.; Baladron Rodriguez, P.; Balagura, V.; Balboni, A.; Baldini, W.; Balzani, L.; Bao, H.; Baptista de Souza Leite, J.; Barbero Pretel, C.; Barbetti, M.; Barbosa, I. R.; Barlow, R. J.; Barnyakov, M.; Barsuk, S.; Barter, W.; Bartolini, M.; Bartz, J.; Basels, J. M.; Bashir, S.; Bassi, G.; Batsukh, B.; Battista, P. 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doi:10.1103/PhysRevLett.134.101802

Study of $Λ_{b}^{0}$ and $Ξ_{b}^{0}$ Decays to $Λ h^{+} h^{' -}$ and Evidence for $C P$ Violation in $Λ_{b}^{0} \to Λ K^{+} K^{-}$ Decays

Journal Article · Wed Mar 12 00:00:00 EDT 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.134.101802· OSTI ID:2530666

; ; ; ; ; ; ; ; ; ; ; Ajaltouni, Z.; ; ; ; ; ; ; ; more »

A study of $Λ_{b}^{0}$ and $Ξ_{b}^{0}$ decays to $Λ h^{+} h^{' -}$ ( $h^{(')} = π, K$ ) is performed using $p p$ collision data collected by the LHCb experiment during LHC Runs 1–2, corresponding to an integrated luminosity of $9 {fb}^{- 1}$ . The branching fractions for these decays are measured using the $Λ_{b}^{0} \to Λ_{c}^{+} (\to Λ π^{+}) π^{-}$ decay as a control channel. The decays $Λ_{b}^{0} \to Λ π^{+} π^{-}$ and $Ξ_{b}^{0} \to Λ K^{-} π^{+}$ are observed for the first time. For decay modes with sufficient signal yields, $C P$ asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for $C P$ violation in the $Λ_{b}^{0} \to Λ K^{+} K^{-}$ decay, interpreted as originating primarily from an asymmetric $Λ_{b}^{0} \to N^{* +} K^{-}$ decay amplitude. The measured $C P$ asymmetries for other decays are compatible with zero.

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI ID:: 2530666

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 134; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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