X-ray line signal from decaying axino warm dark matter

Choi, Ki‐Young; Seto, Osamu

doi:10.1016/j.physletb.2014.06.008

Cited by 62 publications

(35 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, a large number of DM models have been proposed to explain this signal. The ideas that have been proposed include sterile neutrinos , axions [70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85], supersymmetry [86][87][88][89][90][91][92] and a number of other mechanisms . We now show that the 3.5 keV line, if confirmed, can be easily accommodated within the framework of the minimal model.…”

Section: The 35 Kev Linementioning

confidence: 99%

A couplet from flavored dark matter

Agrawal

Chacko

Kılıç

et al. 2015

J. High Energ. Phys.

View full text Add to dashboard Cite

We show that a couplet, a pair of closely spaced photon lines, in the X-ray spectrum is a distinctive feature of lepton flavored dark matter models for which the mass spectrum is dictated by Minimal Flavor Violation. In such a scenario, mass splittings between different dark matter flavors are determined by Standard Model Yukawa couplings and can naturally be small, allowing all three flavors to be long-lived and contribute to the observed abundance. Then, in the presence of a tiny source of flavor violation, heavier dark matter flavors can decay via a dipole transition on cosmological timescales, giving rise to three photon lines. Two of these lines are closely spaced, and constitute the couplet. Provided the flavor violation is sufficiently small, the ratios of the line energies are determined in terms of the charged lepton masses, and constitute a prediction of this framework. For dark matter masses of order the weak scale, the couplet lies in the keV-MeV region, with a much weaker line in the eV-keV region. This scenario constitutes a potential explanation for the recent claim of the observation of a 3.5 keV line. The next generation of X-ray telescopes may have the necessary resolution to resolve the double line structure of such a couplet.

show abstract

Section: The 35 Kev Linementioning

confidence: 99%

A couplet from flavored dark matter

Agrawal

Chacko

Kılıç

et al. 2015

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Among the various theoretical scenarios attempting to explain it, RPV SUSY with an LSP decaying to photon and a neutrino is a possibility. In bilinear RPV it was found that a warm-darkmatter axino with a mass of mα 7 keV can have the proper lifetime and relic density to account for the observed X-ray emission line through its decayα → γν [63,64]. The axino parameter space consistent with the aforesaid X-ray line can be seen in Fig.…”

Section: Implications For Dark Mattermentioning

confidence: 87%

R-parity violating supersymmetry and neutrino physics: experimental signatures

Mitsou¹

2016

Proceedings of 18th International Conference From the Planck Scale to the Electroweak Scale — PoS(PLANCK 2015)

View full text Add to dashboard Cite

R-parity violating supersymmetric models (RPV SUSY) are becoming increasingly more appealing than its R-parity conserving counterpart in view of the hitherto non-observation of SUSY signals at the LHC. In this paper, we discuss RPV scenarios where neutrino masses are naturally generated, namely RPV through bilinear terms (bRPV) and the µ-from-ν supersymmetric standard model (µνSSM). The latter is characterised by a rich Higgs sector that easily accommodates a 125-GeV Higgs boson. The phenomenology of such models at the LHC is reviewed, giving emphasis on final states with displaced objects, and relevant results obtained by LHC experiments are presented. The implications for dark matter for these theoretical proposals is also addressed.

show abstract

“…For example, when m n > 2m e , the n can decay into an electronpositron pair through mixing with the Higgs field. The decay width is given by 11) where α ηH is the mixing angle between η and H, and β e = (1 − 4m 2 e /m 2 n ) 1/2 . For m n = 10 MeV, α ηH = 10 −4 , the lifetime of n becomes about 0.04 sec.…”

Section: Jhep08(2015)023mentioning

confidence: 99%

3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model

Baek¹

2015

J. High Energ. Phys.

View full text Add to dashboard Cite

We consider a local U(1) B−L extension of Zee-Babu model to explain the recently observed 3.5 keV X-ray line signal. The model has three Standard model (SM)-singlet Dirac fermions with different U(1) B−L charges. A complex scalar field charged under U(1) B−L is introduced to break the U(1) B−L symmetry. After U(1) B−L symmetry breaking a remnant discrete symmetry stabilizes the lightest state of the Dirac fermions, which can be a stable dark matter (DM). The second lightest state, if mass splitting with the stable DM is about 3.5 keV, decays dominantly to the stable DM and 3.5 keV photon through two-loop diagrams, explaining the X-ray line signal. Two-loop suppression of the decay amplitude makes its lifetime much longer than the age of the universe and it can be a decaying DM candidate in large parameter region. We also introduce a real scalar field which is singlet under both the SM and U(1) B−L and can explain the current relic abundance of the Dirac fermionic DMs. If the mixing with the SM Higgs boson is small, it does not contribute to DM direct detection. The main contribution to the scattering of DM off atomic nuclei comes from the exchange of U(1) B−L gauge boson, Z ′ , and is suppressed below current experimental bound when Z ′ mass is heavy ( 10 TeV). If the singlet scalar mass is about 0.1-10 MeV, DM self-interaction can be large enough to solve small scale structure problems in simulations with the cold DM, such as, the core-vs-cusp problem and too-big-to-fail problem.

show abstract

X-ray line signal from decaying axino warm dark matter

Cited by 62 publications

References 65 publications

A couplet from flavored dark matter

A couplet from flavored dark matter

R-parity violating supersymmetry and neutrino physics: experimental signatures

3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model

Contact Info

Product

Resources

About