Bulbul et al posit that a 3.57 keV line in stacked XMM Newton Spectra could correspond to a decay of one type of these particles proposed by Dodelson and Widrow. Those particles may be unusually massive via a mechanism that ties the mass of a left handed variety of them to that right handed sterile variety, the seesaw mechanism. Weak interactions between between these particles are parametrized by three mixing angles in the PNMS matrix. The Homestake experiment detected a deficiency in these particles in the Sun that was later resolved by their flavor oscillation. Thes
Bulbul et al posit that a 3.57 keV line in stacked XMM Newton Spectra could correspond to a decay of one type of these particles proposed by Dodelson and Widrow. Those particles may be unusually massive via a mechanism that ties the mass of a left handed variety of them to that right handed sterile variety, the seesaw mechanism. Weak interactions between between these particles are parametrized by three mixing angles in the PNMS matrix. The Homestake experiment detected a deficiency in these particles in the Sun that was later resolved by their flavor oscillation. These particles were predicted by Wolfgang Pauli to account for a loss of energy and momentum in beta decay. For 10 points name these nearly massless leptons that come in tau, mu, and electron varieties.
Bulbul et al posit that a 3.57 keV line in stacked XMM Newton Spectra could correspond to a decay of one type of these particles proposed by Dodelson and Widrow.
neutrinos [Accept sterile neutrinos, prompt on "leptons"]