TY - JOUR
T1 - Extra light fermions in E6-inspired models and the 3.5 keV X-ray line signal
AU - Nakayama, Kazunori
AU - Takahashi, Fuminobu
AU - Yanagida, Tsutomu T.
N1 - Funding Information:
This work was supported by the JSPS Grant-in-Aid for Scientific Research on Innovative Areas (No. 23104008 [F.T.]), JSPS Grant-in-Aid for Young Scientists (B) (No. 26800121 [K.N.], No. 24740135 ) [F.T.]), and Inoue Foundation for Science [F.T.]. This work was also supported by World Premier International Center Initiative (WPI Program), MEXT , Japan.
Publisher Copyright:
© 2014 The Authors.
PY - 2014/10/7
Y1 - 2014/10/7
N2 - We propose a scenario in which extra light fermions in an E6-inspired U(1) extension of the standard model constitute the dark matter, as a simple variation of our model for dark radiation presented in 2010. Interestingly, for the light fermions of mass about 7 keV, we naturally obtain a desired mixing angle to explain the recently discovered 3.5 keV X-ray line signal through the radiative decay into active neutrinos and photons with a lifetime in the range of 1027-1028 seconds.
AB - We propose a scenario in which extra light fermions in an E6-inspired U(1) extension of the standard model constitute the dark matter, as a simple variation of our model for dark radiation presented in 2010. Interestingly, for the light fermions of mass about 7 keV, we naturally obtain a desired mixing angle to explain the recently discovered 3.5 keV X-ray line signal through the radiative decay into active neutrinos and photons with a lifetime in the range of 1027-1028 seconds.
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U2 - 10.1016/j.physletb.2014.08.061
DO - 10.1016/j.physletb.2014.08.061
M3 - Article
AN - SCOPUS:84908220630
SN - 0370-2693
VL - 737
SP - 311
EP - 313
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -