A study of Lambda0b and Xi0b decays to Lambda h+h'− (h(')=pi,K) is performed using pp 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 Lambda0b -> Lambda+c(->Lambda pi+)pi- decay as a control channel. The decays Lambda0𝑏 ->Lambda pi+pi- and Xi0b ->Lambda K-pi+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Lambda0b ->Lambda K+K- decay, interpreted as originating primarily from an asymmetric Lambda0b ->N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.
Study of Lambda0b and Xi0b Decays to Lambda h+h′- and Evidence for CP Violation in Lambda0b ->Lambda K+K- Decays
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;
2025
Abstract
A study of Lambda0b and Xi0b decays to Lambda h+h'− (h(')=pi,K) is performed using pp 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 Lambda0b -> Lambda+c(->Lambda pi+)pi- decay as a control channel. The decays Lambda0𝑏 ->Lambda pi+pi- and Xi0b ->Lambda K-pi+ are observed for the first time. For decay modes with sufficient signal yields, CP asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for CP violation in the Lambda0b ->Lambda K+K- decay, interpreted as originating primarily from an asymmetric Lambda0b ->N*+K- decay amplitude. The measured CP asymmetries for other decays are compatible with zero.| File | Dimensione | Formato | |
|---|---|---|---|
|
PhysRevLett.134.101802.pdf
accesso aperto
Tipologia:
Published version
Licenza:
Creative Commons
Dimensione
1.59 MB
Formato
Adobe PDF
|
1.59 MB | Adobe PDF | |
|
LHCbLbLhhCPV_supplemental.pdf
accesso aperto
Tipologia:
Altro materiale allegato
Licenza:
Creative Commons
Dimensione
505.82 kB
Formato
Adobe PDF
|
505.82 kB | Adobe PDF |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



