Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λânγ.
Phys Rev Lett
; 129(21): 212002, 2022 Nov 18.
Article
de En
| MEDLINE
| ID: mdl-36461970
ABSTRACT
The radiative hyperon decay Λânγ is studied using (10087±44)×10^{6} J/ψ events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay Λânγ is determined to be (0.832±0.038_{stat}±0.054_{syst})×10^{-3}, which is a factor of 2.1 lower and 5.6 standard deviations different than the previous measurement. By analyzing the joint angular distribution of the decay products, the first determination of the decay asymmetry α_{γ} is reported with a value of -0.16±0.10_{stat}±0.05_{syst}.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Phys Rev Lett
Année:
2022
Type de document:
Article