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Title: Axino dark matter in light of an anomalous X-ray line

Axino as the superpartner of axion that solves the strong CP problem can be a good candidate of dark matter. Inspired by the 3.5 keV X-ray line signal found to be originated from galaxy clusters and Andromeda galaxy, we study axino models with R-parity violations, and point out that axino dark matter with trilinear R-parity violations is an attractive scenario that reproduces the X-ray line. The Peccei-Quinn scale is required to be f{sub a} ∼ O(10{sup 9}–10{sup 11}) GeV for trilinear R-parity violating couplings λ ∼ O(10{sup −3}–10{sup −1}) in order to explain the line signal. Moreover, the right-handed stau is predicted to be light, i.e. ∼ O(100) GeV, and thus can be looked for at the LHC. Cosmological aspects of the model are also discussed in this study.
Authors:
 [1]
  1. Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-0033 Japan (Japan)
Publication Date:
OSTI Identifier:
22373548
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 05; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; GALAXIES; GALAXY CLUSTERS; GEV RANGE; KEV RANGE 01-10; NONLUMINOUS MATTER; PARITY; SIGNALS; VIOLATIONS; X RADIATION