Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ →nγ

The BESIII Collaboration

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

The radiative hyperon decay Λ→nγ is studied using (10087±44)×106 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±0.038stat±0.054syst)×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 αγ is reported with a value of -0.16±0.10stat±0.05syst.

Язык оригиналаанглийский
Номер статьи212002
ЖурналPhysical Review Letters
Том129
Номер выпуска21
DOI
СостояниеОпубликовано - 18 нояб. 2022

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