589 research outputs found
Neutrino masses and superheavy dark matter in the 3-3-1-1 model
In this work, we interpret the 3-3-1-1 model when the B-L and 3-3-1 breaking
scales behave simultaneously as the inflation scale. This setup not only
realizes the previously-achieved consequences of inflation and leptogenesis,
but also provides new insights in superheavy dark matter and neutrino masses.
We argue that the 3-3-1-1 model can incorporate a scalar sextet, which induces
both small masses for the neutrinos via a combined type I and II seesaw and
large masses for the new neutral fermions. Additionally, all the new particles
have the large masses in the inflation scale. The lightest particle among the
W-particles that have abnormal (i.e., wrong) B-L number in comparison to those
of the standard model particles may be a superheavy dark matter as it is
stabilized by the W-parity. The dark matter candidate may be a Majorana
fermion, a neutral scalar, or a neutral gauge boson, which was properly created
in the early universe due to the gravitational effects on the vacuum or the
thermal production after cosmic inflation.Comment: 34 pages, improved with discussions on inflation and reheating as
well as presentation, matches published version in EPJ
Fermion masses in the economical 3-3-1 model
We show that, in frameworks of the economical 3-3-1 model, all fermions get
masses. At the tree level, one up-quark and two down-quarks are massless, but
the one-loop corrections give all quarks the consistent masses. This conclusion
is in contradiction to the previous analysis in which, the third scalar triplet
has been introduced. This result is based on the key properties of the model:
First, there are three quite different scales of vacuum expectation values:
\om \sim {\cal O}(1) \mathrm{TeV}, v \approx 246 \mathrm{GeV} and . Second, there exist two types of Yukawa couplings
with different strengths: the lepton-number conserving couplings 's and the
lepton-number violating ones 's satisfying the condition in which the second
are much smaller than the first ones: .
With the acceptable set of parameters, numerical evaluation shows that in
this model, masses of the exotic quarks also have different scales, namely, the
exotic quark () gains mass GeV, while the
D_\al exotic quarks (q_{D_\al} = -1/3) have masses in the TeV scale:
m_{D_\al} \in 10 \div 80 TeV.Comment: 20 pages, 8 figure
IMMOBILIZED-LIPOSOME SENSOR SYSTEM FOR DETECTION OF DAMAGED PROTEINS
Joint Research on Environmental Science and Technology for the Eart
Dengue epidemic in southern Vietnam, 1998.
A widespread epidemic of dengue hemorrhagic fever (DHF) occurred in southern Vietnam in 1998, with 438.98 cases/100,000 population and 342 deaths. The number of DHF cases and deaths per 100,000 population increased 152.4% and 151.8%, respectively, over a 1997 epidemic. Dengue viruses were isolated from 143 patient blood samples; DEN-3 virus was identified as the predominant serotype, although a resurgence of DEN-4 was noted
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