Axino dark matter with R-parity violation and 130 GeV gamma-ray line

Abstract

We show that decaying axino dark matter with R-parity violation can explain the observed excess of the 130GeV gamma-ray line from the Galactic center in the Fermi data. The branching fraction of the axino decay into monochromatic photons can be O(1), and constraints from continuum gamma-rays and the anti-proton flux are ameliorated. The Peccei-Quinn scale of O(10 13 − 10 14 ) GeV and the R-parity violation parameter of O(10 −12 − 10 −11 ) are cosmologically favored.

R-parity violating supersymmetry and neutrino physics: experimental signatures

“…A decaying axino DM scenario based on the SUSY KSVZ axion model with the bilinear R-parity violation explains the Fermi 130-GeV gamma-ray line excess from the GC while satisfying other cosmological constraints [14]. On the other hand, gravitino dark matter with trilinear RPV can account for the gamma-ray line, since there is no overproduction of anti-proton flux, while being consistent with Big-Bang nucleosynthesis and thermal leptogenesis [11].…”

“…Being a WIMP, once produced at the LHC, it will escape detection, resulting in large missing transverse momentum, E miss T . Providing a DM candidate is one of the strongest arguments in favour of RPC SUSY, nonetheless RPV models do exist that can explain DM through, for instance, very light gravitinos [4 -11], axions [12,10] or axinos [10,13,14].…”

Probing neutrino physics at LHC throughR-parity breaking supersymmetry

“…A decaying axino DM scenario based on the SUSY KSVZ axion model with the bilinear Rparity violation explains the Fermi 130 GeV gamma-ray line excess from the GC while satisfying EPJ Web of Conferences 00092-p.8 other cosmological constraints [13]. On the other hand, gravitino dark matter with trilinear RPV -in particular models with the LLE RPV coupling-can account for the gamma-ray line, since there is no overproduction of anti-proton flux, while being consistent with big-bang nucleosynthesis and thermal leptogenesis [10].…”

“…Being a WIMP, once produced at the LHC, it will escape detection, resulting in large missing transverse energy, E miss T . Providing a DM candidate is one of the strongest advantages of RPC SUSY even though also RPV models exist which may explain DM through, for instance, very light gravitinos [5][6][7][8][9][10], axions [9,11] or axinos [9,12,13]. There is no fundamental reason for R parity to be conserved thus lepton and baryon number violating renormalisable terms can appear in the supersymmetric potential in the following way:…”

“…Subsequently upper limits have been set on the size of the R-parity violating coupling in the range of 10 8 to 8 × 10 13 . These limits are much stricter than those coming from contributions to the neutrino mass or from the washout of the baryon asymmetry in the early Universe.…”