Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ→nγ.
Journal
Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141
Informations de publication
Date de publication:
18 Nov 2022
18 Nov 2022
Historique:
received:
23
06
2022
revised:
27
09
2022
accepted:
24
10
2022
entrez:
3
12
2022
pubmed:
4
12
2022
medline:
4
12
2022
Statut:
ppublish
Résumé
The radiative hyperon decay Λ→nγ 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 Λ→nγ 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}.
Identifiants
pubmed: 36461970
doi: 10.1103/PhysRevLett.129.212002
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM