two gamma event


Prateek Agrawal

Detecting and discriminating WIMP Dark Matter

Nov. 29, 2010

We perform a model-independent classification of Weakly Interacting Massive Particle (WIMP) dark matter candidates that have the property that their scattering off nucleons is dominated by spin-dependent interactions. We study renormalizable theories where the scattering of dark matter is elastic and arises at tree-level. We show that if the WIMP-nucleon cross section is dominated by spin-dependent interactions the natural dark matter candidates are either Majorana fermions or real vector bosons, so that the dark matter particle is its own anti-particle. In such a scenario, scalar dark matter is disfavored. Dirac fermion and complex vector boson dark matter are also disfavored, except for very specific choices of quantum numbers. We further establish that any such theory must contain either new particles close to the weak scale with Standard Model quantum numbers, or alternatively, a $Z'$ gauge boson with mass at or below the TeV scale. In the region of parameter space that is of interest to current direct detection experiments, these particles naturally lie in a mass range that is kinematically accessible to the Large Hadron Collider

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Abstract: I will discuss how we can use results from dark matter
experiments to draw model-independent conclusions about the nature of
WIMP dark matter. Specifically, I show that combining the results of
direct detection experiments with data from neutrino telescopes can
help establish whether the dark matter particle is its own
anti-particle. Further, I will discuss model-independent features of
the photon continuum and line spectra arising from dark matter
annihilation, and show how these may be used to obtain general
constraints on theories of dark matter.

Time: 1:30pm-3:00pm

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