1,558 research outputs found
Precise photoproduction of the charged top-pions at the LHC with forward detector acceptances
We study the photoproduction of the charged top-pion predicted by the top
triangle moose () model (a deconstructed version of the topcolor-assisted
technicolor model) via the processes at the 14 Large Hadron Collider ()
including next-to-leading order () corrections. Our results show
that the production cross sections and distributions are sensitive to the free
parameters and . Typical correction value is and does not depend much on as well as the forward
detector acceptances.Comment: 21pages, 7figures. arXiv admin note: text overlap with
arXiv:1201.4364 by other author
The signatures of the new particles and at e-p colliders in the model
Considering the superior performances of the future e-p colliders, LHeC and
FCC-eh, we discuss the feasibility of detecting the extra neutral scalar
and the light gauge boson , which are predicted by the
model. Taking into account the experimental
constraints on the relevant free parameters, we consider all possible
production channels of and at e-p colliders and
further investigate their observability through the optimal channels in the
case of the beam polarization P()= -0.8. We find that the signal
significance above 5 of as well as detecting
can be achieved via
process and a 5 sensitivity of detecting can be gained
via
process at e-p colliders with appropriate parameter values and a designed
integrated luminosity. However, the signals of decays into pair of SM
particles are difficult to be detected.Comment: 22 pages, 9 figures, references added and typos are correcte
LFV couplings of the extra gauge boson Z' and leptonic decay and production of pseudoscalar mesons
Considering the constraints of the lepton flavor violating (LFV) processes
and on the LFV couplings
, in the contexts of the models, the left-right
(LR) models, the "alternative" left-right (ALR) models and the 331 models, we
investigate the contributions of the extra gauge boson to the decay rates
of the processes ,
and with and
. Our numerical results show that the maximal values of the branching
ratios for these processes are not dependent on the mass at
leader order. The extra gauge boson predicted by the models
can make the maximum value of the branching ratio
reach . All
models considered in this paper can produce significant contributions to the
process . However, the value of
is far below its corresponding experimental upper bound.Comment: 14 pages, 2 figures; matches published versio
Production of the top-pions from the higgsless--top-Higgs model at the LHC
The top-pions() predicted by extra dimensional descriptions
of the topcolor scenario have similar feature with those in four dimensional
topcolor scenario, which have large Yukawa couplings to the third generation
quarks. In the context of the higgsless--top-Higgs(HTH) model, we discuss the
production of these new particles at the CERN Large Hadron Collider(LHC) via
various suitable mechanisms (gluon-gluon fusion, bottom-bottom fusion,
gluon-bottom fusion, and the usual Drell-Yan processes) and estimate their
production rates. We find that, as long as the top-pions are not too heavy,
they can be abundantly produced at the LHC. The possible signatures of these
new particles might be detected at the LHC experiments.Comment: 18pages, 6 figures, discussions and references added, typos correcte
Asymptotically Exact, Embarrassingly Parallel MCMC
Communication costs, resulting from synchronization requirements during
learning, can greatly slow down many parallel machine learning algorithms. In
this paper, we present a parallel Markov chain Monte Carlo (MCMC) algorithm in
which subsets of data are processed independently, with very little
communication. First, we arbitrarily partition data onto multiple machines.
Then, on each machine, any classical MCMC method (e.g., Gibbs sampling) may be
used to draw samples from a posterior distribution given the data subset.
Finally, the samples from each machine are combined to form samples from the
full posterior. This embarrassingly parallel algorithm allows each machine to
act independently on a subset of the data (without communication) until the
final combination stage. We prove that our algorithm generates asymptotically
exact samples and empirically demonstrate its ability to parallelize burn-in
and sampling in several models
Design, fabrication, and testing of micromachined silicone rubbermembrane valves
Technologies for fabricating silicone rubber membranes and integrating them with other processes on silicon wafers have been developed. Silicone rubber has been found to have exceptional mechanical properties including low modulus, high elongation, and good sealing. Thermopneumatically actuated, normally open, silicone rubber membrane valves with optimized components have been designed, fabricated, and tested. Suspended silicon nitride membrane heaters have been developed for low-power thermopneumatic actuation. Composite silicone rubber on Parylene valve membranes have been shown to have low permeability and modulus. Also, novel valve seats were designed to improve sealing in the presence of particles. The valves have been extensively characterized with respect to power consumption versus flow rate and transient response. Low power consumption, high flow rate, and high pressure have been demonstrated. For example, less than 40 mW is required to switch a 1-slpm nitrogen flow at 33 psi. Water requires dose to 100 mW due to the cooling effect of the liquid
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