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Isospin amplitudes in [lambda]0b → J/[psi lambda] ([sigma]0) and [xi]0b → J/[psi xi]0 ([lambda]) decays

Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity...

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Main Authors: Aaij, Roel (Author) , Archilli, Flavio (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Borsato, Martino (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Hu, Jiangqiao (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Malygina, Hanna (Author) , Marks, Jörg (Author) , Piucci, Alessio (Author) , Uwer, Ulrich (Author) , Witola, Lukas (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 17 March 2020
In: Physical review letters
Year: 2020, Volume: 124, Issue: 11
ISSN:1079-7114
DOI:10.1103/PhysRevLett.124.111802
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.124.111802
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.124.111802
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Author Notes:R. Aaij et al. (LHCb Collaboration)*
Description
Summary:Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in b-baryon decays, using data corresponding to an integrated luminosity of 8.5 fb−1, collected with the LHCb detector in pp collisions at center of mass energies of 7, 8, and 13 TeV. The isospin amplitude ratio |A1(Λ0b→J/ψΣ0)/A0(Λ0b→J/ψΛ)|, where the subscript on A indicates the final-state isospin, is measured to be less than 1/21.8 at 95% confidence level. The Cabibbo suppressed Ξ0b→J/ψΛ decay is observed for the first time, allowing for the measurement |A0(Ξ0b→J/ψΛ)/A1/2(Ξ0b→J/ψΞ0)|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.
Item Description:Im Titel sind lambda, psi, sigma und xi als griechische Buchstaben dargestellt
Im Titel ist die Ziffer "0" hochgestellt und der Buchstabe b tiefgestellt
LHCb Collaboration*: Roel Aaij, Flavio Archilli, Sebastian Bachmann, Daniel Berninghoff, Martino Borsato, David Gerick, Jascha Grabowski, Paul André Günther, Xiaoxue Han, Stephanie Hansmann-Menzemer, Jiangqiao Hu, Renata Kopecná, Blake Leverington, Hanna Malygina, Jörg Marks, Alessio Piucci, Ulrich Uwer, Lukas Witola, Alexey Zhelezov [und 889 weitere]
Gesehen am 30.09.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.124.111802

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