Dark matter: The leptonic connection

• DOI: 10.1016/j.physletb.2009.02.015
• Publication Date: 2009-02-13T13:41:02Z
• Authors: Qing-Hong Cao; Ernest Ma; Gabe Shaughnessy
• Keywords: Nuclear and High Energy Physics; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology (hep-ph); 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

Recent observatons of high-energy positrons and electrons by the PAMELA and ATIC experiments may be an indication of the annihilation of dark matter into leptons and not quarks. This leptonic connection was foreseen already some years ago in two different models of radiative neutrino mass. We discuss here the generic interactions (nu eta^0 - l eta^+) chi and l^c zeta^- chi^c which allow this to happen, where chi and/or chi^c are fermionic dark-matter candidates. We point out in particular the importance of chi chi to l^+ l^- gamma to both positron and gamma-ray signals within this framework.<br/>4 pages, 5 figures. v2: PLB version<br/>