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

Abstract

Here, we consider the effects of R-parity violation due to the inclusion of a bilinear μ'LH _u 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 × 10 ¹³ 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.

Authors:

Dudas, Emilian; Gherghetta, Tony; Kaneta, Kunio; Mambrini, Yann; Olive, Keith A.

Publication Date:

2018-07-23

Research Org.:

Chicago Operations Office, Argonne, IL (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1461229

Alternate Identifier(s):

OSTI ID: 1498653

Grant/Contract Number:  

[SC0011842; 06482; 674896; 690575]

Resource Type:

Published Article

Journal Name:

Physical Review D

Additional Journal Information:

[Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 1]; Journal ID: ISSN 2470-0010

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS