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On sgoldstino interpretation of HyperCP events
We discuss possible sgoldstino interpretation of the observation, reported by
HyperCP collaboration, of three decay events with
dimuon invariant mass 214.3 MeV within detector resolution. We find that this
interpretation is consistent in models with (i) parity conservation in
sgoldstino interactions, (ii) pseudoscalar sgoldstino of mass 214 MeV and
heavier scalar sgoldstino, and (iii) low supersymmetry breaking scale, \sqrt{F}
= 2.5-60 TeV. In these models, sgoldstino can be observed in decays
, and at the branching
ratios of at least of order 10^{-12}, 10^{-8} and 10^{-11}, respectively.
The model can be probed also at e^+e^- colliders in the channels
and , where the cross section is likely
to be in the range 1 pb - 5 ab.Comment: 14 pages, 1 figure; v2: replaced with journal version, predictions
for kaons refine
and decays within the Chiral Perturbation Theory
Decays and
are examined to the leading order
in momenta in the framework of Chiral Perturbation Theory. Predictions of the
Standard Model for the muon and electron differential energy spectra and
branching ratios of and are presented.Comment: 10 pages, 4 figures; v2: Introduction and Conclusion extended,
journal versio
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