Alejandro Ibarra
(TUM)
05/08/2011, 14:00
Particle Physics
Oral
Dark matter particles which decay into charged fermions produce, via radiative
corrections, monoenergetic gamma rays with a branching ratio that depends on the
details of the dark matter model. We analyze in this talk the prospects to detect
monoenergetic gamma-rays from radiative dark matter decays at present and future
experiments. We also discuss the implications for concrete models of...
Ms
Francis Froborg
(University of Zurich)
05/08/2011, 14:20
Particle Physics
Oral
The GERDA experiment uses the neutrinoless double beta decay to probe three
fundamental questions in neutrino physics - Are they Dirac or Majorana particles?
What is their absolute mass? What is the mass hierarchy of the three generations? It
uses high-purity germanium detectors enriched in Ge-76 which are submerged nakedly in
liquid argon. Due to an expected half life of the neutrinoless...
Dr
Alexander Merle
(Royal Institute of Technology (KTH))
05/08/2011, 14:40
Particle Physics
Oral
When thinking about Dark Matter, one always has the typical WIMP with a mass of a few
100 GeV in mind. In this talk, we will argue that another valid possibility is to
have sterile neutrinos at the keV scale ("Warm Dark Matter"), which can yield the
correct Dark Matter abundance when, e.g., produced non-thermally. The crucial
advantage of this framework is that we need some type of...
Prof.
Fuminobu Takahashi
(Tohoku University)
05/08/2011, 15:00
Particle Physics
Oral
We propose that the stability of dark matter is ensured by a discrete subgroup of the
U(1)B-L gauge symmetry, Z_2(B-L). We introduce a set of chiral fermions charged
under the U(1)B-L in addition to the right-handed neutrinos, and require the anomaly-
cancellation conditions associated with the U(1)B-L gauge symmetry. We find that the
possible number of fermions and their charges are...
Fabio Iocco
(Institute d'Astrophysique de Paris)
05/08/2011, 16:00
Particle Physics
Oral
New CMB measurements of the cosmic microwave background anisotropies permit to
place strong constraints on the DM annihilation cross section at epochs very close to
that of Recombination. Such constraints do not suffer from "systematic astrophysical
uncertinties" such as the dependence on the halo shape and concetration, halo minimal
mass, depending only on the cosmological parameters....
Matthew Buckley
(Fermilab)
05/08/2011, 16:20
Particle Physics
Oral
The anomaly reported recently by CDF can be well fit by a massive Z' coupling
primarily to baryons. The U(1) gauge group associated with such a Z' is anomalous in
the Standard Model; and so additional particle content is required. In this talk, I
discuss two possible UV theories which include a leptophobic Z', and demonstrate that
these models generically contain a viable dark matter...