5,689 research outputs found
Running of Low-Energy Neutrino Masses, Mixing Angles and CP Violation
We calculate the running of low-energy neutrino parameters from the bottom
up, parameterizing the unknown seesaw parameters in terms of the dominance
matrix . We find significant running only if the matrix is non-trivial
and the light-neutrino masses are moderately degenerate. If the light-neutrino
masses are very hierarchical, the quark-lepton complementarity relation
is quite stable, but may run
beyond their likely future experimental errors. The running of the oscillation
phase is enhanced by the smallness of , and jumps in the
mixing angles occur in cases where the light-neutrino mass eigenstates cross.Comment: 14 pages, 7 figure
Missing data in clinical trials
The aim of this Bachelor’s Thesis is to explain what missing data means and give some ways to deal with it in clinical trials. Firstly, an overview of different types of missing data is given and the reasons for their occurrence. Second part of the thesis explains which analytical approaches can be used to conduct an unbiased analysis. Further, missing data are simulated for a data set to show how the approaches described are used in practice with SAS software
Implications of XENON100 and LHC results for Dark Matter models
We perform a fit to the recent Xenon100 data and study its implications for
Dark Matter scenarios. We find that Inelastic Dark Matter is disfavoured as an
explana- tion to the DAMA/LIBRA annual modulation signal. Concerning the scalar
singlet DM model, we find that the Xenon100 data disfavors its constrained
limit. We study the CMSSM as well as the low scale phenomenological MSSM taking
into account latest Tevatron and LHC data (1.1/fb) about sparticles and Bs
\rightarrow {\mu}{\mu}. After the EPS 2011 conference, LHC excludes the
"Higgs-resonance" region of DM freeze-out and Xenon100 disfavors the
"well-tempered" bino/higgsino, realized in the "focus-point" region of the
CMSSM parameter space. The preferred region shifts to heavier sparticles,
higher fine-tuning, higher tan {\beta} and the quality of the fit deteriorates.Comment: v4: addendum included at the light of the Dark Matter and Higgs data
presented during july 2012 by the Xenon100, ATLAS and CMS collaboration
CDMS stands for Constrained Dark Matter Singlet
Motivated by the two candidate Dark Matter events observed by the CDMS
experiment, we consider a Constrained Dark Matter Singlet (CDMS) model that,
with no free parameters, predicts the DM mass and the DM direct cross section
to be in the range weakly favored by CDMS.Comment: 6 pages, 2 figure
Matter parity as the origin of scalar Dark Matter
We extend the concept of matter parity to
non-supersymmetric theories and argue that is the natural explanation to
the existence of Dark Matter of the Universe. We show that the
non-supersymmetric Dark Matter must be contained in scalar 16 representation(s)
of thus the unique low energy Dark Matter candidates are -odd
complex scalar singlet(s) and inert scalar doublet(s) We have
calculated the thermal relic Dark Matter abundance of the model and shown that
its minimal form may be testable at LHC via the SM Higgs boson decays The PAMELA anomaly can be explained with the decays
induced via seesaw-like operator which is additionally suppressed by Planck
scale. Because the SM fermions are odd under matter parity too, the DM sector
is just our scalar relative.Comment: The origin of scalar DM is emphasized, version accepted by PR
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