Isospin Amplitudes in Λ_{b}
Phys Rev Lett
; 124(11): 111802, 2020 Mar 20.
Article
em En
| MEDLINE
| ID: mdl-32242683
ABSTRACT
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 |A_{1}(Λ_{b}^{0}âJ/ψΣ^{0})/A_{0}(Λ_{b}^{0}âJ/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 Ξ_{b}^{0}âJ/ψΛ decay is observed for the first time, allowing for the measurement |A_{0}(Ξ_{b}^{0}âJ/ψΛ)/A_{1/2}(Ξ_{b}^{0}âJ/ψΞ^{0})|=0.37±0.06±0.02, where the uncertainties are statistical and systematic, respectively.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Holanda