Shaolong Chen (University of Maryland)
Decaying gravitino dark matter and cosmic electron/positron excess
Abstract
Recent observation of an excess of positrons in PAMELA
experiment in the energy range from 10 to 100 GeV has confirmed similar
observations several years ago by the HEAT and AMS experiments.
While it is quite possible that this
excess is of pure astrophysical origin, there is hope that this may
be coming from the dark matter in our galaxy.
To interpret the observations by dark matter, one has to explain the lack
of excess in the hadrons and get an adequate enough positron flux.
We propose a new class of R-parity violating extension of
MSSM by adding a pairing of triplet-Higgs,
ΔΔ.
This also provides neutrino masses through with type II seesaw mechanism.
The R-parity is violated by the term LΔHd which is well hidden
from low energy experimental probes unlike those in the MSSM
R-Parity breaking models.