Heavy concerns about the light axino explanation of the 3.5 keV X-ray line

Heavy concerns about the light axino explanation of the 3.5 keV X-ray line

An unidentified 3.5 keV line from X-ray observations of galaxy clusters has been reported recently. Although still under scrutiny, decaying dark matter could be responsible for this signal. We investigate whether an axino with a mass of 7 keV could explain the line, keeping the discussion as model i...

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Main Authors: Stefano Colucci, Herbi K. Dreiner, Florian Staub, Lorenzo Ubaldi
Format: Article
Language:English
Published: Elsevier 2015-11-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269315006772
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spelling doaj-2bf5f53eb1394df082b310eb6b84982b2020-11-24T21:57:24ZengElsevierPhysics Letters B0370-26931873-24452015-11-01750C10711110.1016/j.physletb.2015.09.009Heavy concerns about the light axino explanation of the 3.5 keV X-ray lineStefano Colucci0Herbi K. Dreiner1Florian Staub2Lorenzo Ubaldi3Physikalisches Institut der Universität Bonn, Bethe Center for Theoretical Physics, Nußallee 12, 53115 Bonn, GermanyPhysikalisches Institut der Universität Bonn, Bethe Center for Theoretical Physics, Nußallee 12, 53115 Bonn, GermanyTheory Division, CERN, 1211 Geneva 23, SwitzerlandRaymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, IsraelAn unidentified 3.5 keV line from X-ray observations of galaxy clusters has been reported recently. Although still under scrutiny, decaying dark matter could be responsible for this signal. We investigate whether an axino with a mass of 7 keV could explain the line, keeping the discussion as model independent as possible. We point out several obstacles, which were overlooked in the literature, and which make the axino an unlikely candidate. The only viable scenario predicts a light metastable neutralino, with a mass between 0.1 and 10 GeV and a lifetime between 10−3 and 104 s.http://www.sciencedirect.com/science/article/pii/S0370269315006772
collection DOAJ
language English
format Article
sources DOAJ
author Stefano Colucci
Herbi K. Dreiner
Florian Staub
Lorenzo Ubaldi
spellingShingle Stefano Colucci
Herbi K. Dreiner
Florian Staub
Lorenzo Ubaldi
Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
Physics Letters B
author_facet Stefano Colucci
Herbi K. Dreiner
Florian Staub
Lorenzo Ubaldi
author_sort Stefano Colucci
title Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
title_short Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
title_full Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
title_fullStr Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
title_full_unstemmed Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
title_sort heavy concerns about the light axino explanation of the 3.5 kev x-ray line
publisher Elsevier
series Physics Letters B
issn 0370-2693
1873-2445
publishDate 2015-11-01
description An unidentified 3.5 keV line from X-ray observations of galaxy clusters has been reported recently. Although still under scrutiny, decaying dark matter could be responsible for this signal. We investigate whether an axino with a mass of 7 keV could explain the line, keeping the discussion as model independent as possible. We point out several obstacles, which were overlooked in the literature, and which make the axino an unlikely candidate. The only viable scenario predicts a light metastable neutralino, with a mass between 0.1 and 10 GeV and a lifetime between 10−3 and 104 s.
url http://www.sciencedirect.com/science/article/pii/S0370269315006772
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AT florianstaub heavyconcernsaboutthelightaxinoexplanationofthe35kevxrayline
AT lorenzoubaldi heavyconcernsaboutthelightaxinoexplanationofthe35kevxrayline
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