Cosmological signatures of supersymmetry with spontaneously broken R parity

Details Cosmological signatures of supersymmetry with spontaneously broken R parity Cosmological signatures of supersymmetry with spontaneously broken R parity

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phlb..266..382b&link_type=abstract

Physics Letters B, Volume 266, Issue 3-4, p. 382-388.

Physics

26

Scientific paper

We discuss mechanisms of spontaneous R parity breaking provided by nonzero sneutrino vacuum expectation values (VEVs) = νR, = νL with (νL<<νL). With the standard SU (2) ⊗ U (1) gauge structure this is associated with the existence of a majoron. The majoron, J, is mostly an isosinglet sneutrino (V~R) which does not contribute to Z0 decay. The assumption that the lightest supersymmetric particle - neutralino - is responsible for the observed dark matter in the Universe implies that R parity violation is extremel weak. Lower limits on neutralino lifetime τχ are imposed by the decays χ-->νL+q+q¯ and χ-->νL+e-+e- which produce diffuse X-ray radiation and high energy positrons in our Galaxy. The main neutralino decay channel χ-->ν+J can produce a detectable monoenergetic neutrino flux, with the number of neutrino events up to ~ 103 events per 1 kiloton per year in underground detectors. The gamma-ray line produces by the decay χ-->ν+γ decay can be detectable in the case of large mχ and νR.
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