Cosmic Ray Positrons from Annihilations into a New, Heavy Lepton

Abstract

Recent results from the PAMELA experiment indicate an excess in the positron spectrum above 10 GeV, but anti-proton data are consistent with the expected astrophysical backgrounds. We propose a scenario that reproduces these features. Dark matter annihilates through channels involving a new heavy vectorlike lepton which then decays by mixing with Standard Model leptons. If charged, this heavy lepton might be produced at the LHC, and could lead to multi-lepton final states or to long-lived charged tracks. Large neutrino detectors such as ANTARES or IceCube might be sensitive to a monochromatic neutrino line. This scenario may be simply embedded in various models, including an extension to the NMSSM.

26 pages, 7 figures; refs added, SU(2) doublet model considered, discussion of monochromatic neutrino and electron signals

References in corpus (16)

• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• PAMELA data and leptonically decaying dark matter
• Gamma rays and positrons from a decaying hidden gauge boson
• Dark Matter Signals from Cascade Annihilations
• Discriminating different scenarios to account for the cosmic $e^{\pm }$ excess by synchrotron and inverse Compton radiation
• Conservative Constraints on Dark Matter Annihilation into Gamma Rays
• High-energy Cosmic-Ray Positrons from Hidden-Gauge-Boson Dark Matter
• TeV Scale Singlet Dark Matter
• Changes in Dark Matter Properties After Freeze-Out
• Search for charged massive long-lived particles with the D0 detector
• Prospects for Detecting Neutrino Signals from Annihilating/Decaying Dark Matter to Account for the PAMELA and ATIC results

Cited by in corpus (3)

• Breaking the Dark Force
• ATIC, PAMELA, HESS, Fermi and nearby Dark Matter subhalos
• Cosmic Ray Positrons from Cosmic Strings