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Are we close to solving the puzzle of weak radiative hyperon decays?
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abstract
The BESIII experiment at the Beijing Electron Positron collider, run as a ``hyperon factory'', recently reported the first measurement of the asymmetry parameter of the $\Lambda\to n\gamma$ decay and updated its branching fraction, which differs from the PDG average by 5.6 sigma. We highlight the impact of this new measurement on our understanding of the puzzle of weak radiative hyperon decays and pinpoint what needs to be done in the future.
Forward citations
Cited by 2 Pith papers
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Unraveling weak radiative hyperon decays with broken flavor symmetry
A broken-SU(3) fit with eight parameters reproduces the observed hyperon radiative decay data and predicts a sizable negative Xi- -> Sigma- gamma asymmetry that current data do not rule out.
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SU(3) flavor symmetry analysis of hyperon non-leptonic two body decays
An SU(3)-based fit with strange-quark-mass corrections reproduces most hyperon decay data, but leaves a weak 1-sigma deviation in Sigma+ to p pi0 that the authors interpret as a possible sign of new physics.
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