16,096 research outputs found
Can WIMP Dark Matter overcome the Nightmare Scenario?
Even if new physics beyond the Standard Model (SM) indeed exists, the energy
scale of new physics might be beyond the reach at the Large Hadron Collider
(LHC) and the LHC could find only the Higgs boson but nothing else. This is the
so-called "nightmare scenario". On the other hand, the existence of the dark
matter has been established from various observations. One of the promising
candidates for thermal relic dark matter is a stable and electric
charge-neutral Weakly Interacting Massive Particle (WIMP) with the mass below
the TeV scale. In the nightmare scenario, we introduce a WIMP dark matter
singlet under the SM gauge group, which only couples to the Higgs doublet at
the lowest order, and investigate a possibility that such WIMP dark matter can
be a clue to overcome the nightmare scenario via various phenomenological tests
such as the dark matter relic abundance, the direct detection experiments for
the dark matter particle, and the production of the dark matter particle at the
LHC.Comment: 14 pages, 10 figure
Whitepaper on Super-weakly Interacting Massive Particles for Snowmass 2013
Super-weakly interacting massive particles produced in the late decays of
weakly interacting massive particles (WIMPs) are generic in large regions of
supersymmetric parameter space and other frameworks for physics beyond the
standard model. If their masses are similar to that of the decaying WIMP, then
they could naturally account for all of the cosmological dark matter abundance.
Their astrophysical consequences and collider signatures are distinct and
different from WIMP candidates. In particular, they could modify Big Bang
Nucleosynthesis, distort the Cosmic Microwave Background, reduce galactic
substructure and lower central densities of low-mass galaxies.Comment: 4 pages, 2 figures, white paper for Snowmass 201
Dark Matter Phenomenology
I review recent developments in the direct and indirect detection of dark
matter and new candidates beyond the WIMP paradigm.Comment: 6 pages, to appear in the Proceedings of the Tenth Conference on the
Intersections of Particle and Nuclear Physics (CIPANP 2009), San Diego,
California, 26-31 May 200
GLAST Dark Matter Search
The GLAST Large Area Telescope, scheduled for launch in 2006, is a next
generation space based gamma ray telescope which will improve in point source
sensitivity by a factor of 30 over that of EGRET below 10 GeV, and extend
beyond EGRET up to 300 GeV. Thus GLAST offers a unique opportunity to discover
WIMP dark matter through precision studies of gamma rays produced in pair
annihilations. The most dense region of dark matter in our galaxy is currently
thought to occur at the center; in particular, dark matter should concentrate
within 3 pc of the putative supermassive black hole located at the SgrA* radio
source. In fact, the 2nd and 3rd EGRET catalogs contain a significant point
source coincident with the Milky Way galactic center within a resolution of 12
arcminutes. The EGRET team has determined that the spectral and temporal
characteristics of this point source are consistent with dark matter WIMP
annihilations. More detailed analysis has determined that the magnitude and
spectrum of the EGRET source is consistent with relic WIMPs concentrated within
3 pc of the central supermassive black hole. Furthermore, the SgrA* radio
emission is consistent with the synchrotron radiation expected from electrons
and positrons produced in WIMP annihilations. If true, then GLAST should be
able to constrain the particle properties of the postulated WIMP with 1 month
of data.Comment: Poster at the XXII Physics in Collisions Conference (PIC02),
Stanford, Ca, USA, June 2002, 3 pages, LaTeX, 2 eps figures. PSN THAP0
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