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Title: Gravitino decay in high scale supersymmetry with R -parity violation

Journal Article · · Physical Review. D.

We consider the effects of R-parity violation due to the inclusion of a bilinear μ'LHu superpotential term in high-scale supersymmetric models with an EeV scale gravitino as dark matter. Although the typical phenomenological limits on this coupling (e.g., due to lepton number violation and the preservation of the baryon asymmetry) are relaxed when the supersymmetric mass spectrum is assumed to be heavy (in excess of the inflationary scale of 3 × 1013 GeV), the requirement that the gravitino be sufficiently long lived so as to account for the observed dark matter density, leads to a relatively strong bound on μ' ≲ 20 GeV. The dominant decay channels for the longitudinal component of the gravitino are Zν, W±l, and hν. To avoid an excess neutrino signal in IceCube, our limit on μ' is then strengthened to μ' ≲ 50 keV. When the bound is saturated, we find that there is a potentially detectable flux of monochromatic neutrinos with EeV energies.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE; European Union Horizon 2020; RISE InvisiblesPlus; European Research Council (ERC); Agence Nationale de la Recherché (ANR)
Grant/Contract Number:
SC0011842; 06482; 674896; 690575
OSTI ID:
1461229
Alternate ID(s):
OSTI ID: 1498653
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 98 Journal Issue: 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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