156,840 research outputs found
Unstable-particles pair production in MPTapproach in NNLO
We consider pair production and decay of fundamental unstable particles in
the framework of a modified perturbation theory treating resonant contributions
in the sense of distributions. Outcomes of a numerical simulation up to the
NNLO with taking into account universal massless-particles contributions are
presented.Comment: 3 pages, 1 figure, Talk given at 14th Lomonosov Conference on
Elementary Particle Physics, Moscow, August 19-25, 200
Study of the slepton non-universality at the CERN Large Hadron Collider
In supersymmetric theory, the sfermion-fermion-gaugino interactions conserve
the chirality of (s)fermions. The effect appears as the charge asymmetry in
distributions at the CERN Large Hadron Collider where jets and leptons
arise from the cascade decay . Furthermore, the decay branching ratios and the charge
asymmetries in distributions are flavor non-universal due to the
and mixing. When is large, the
non-universality between and becomes level. We perform a
Monte Carlo simulation for some minimal supergravity benchmark points to
demonstrate the detectability.Comment: 19 pages, 6 figures, revte
Does gravity cause load-bearing bridges in colloidal and granular systems?
We study structures which can bear loads, "bridges", in particulate packings. To investigate the relationship between bridges and gravity, we experimentally determine bridge statistics in colloidal packings. We vary the effective magnitude and direction of gravity, volume fraction, and interactions, and find that the bridge size distributions depend only on the mean number of neighbors. We identify a universal distribution, in agreement with simulation results for granulars, suggesting that applied loads merely exploit preexisting bridges, which are inherent in dense packings
Packing-Limited Growth
We consider growing spheres seeded by random injection in time and space.
Growth stops when two spheres meet leading eventually to a jammed state. We
study the statistics of growth limited by packing theoretically in d dimensions
and via simulation in d=2, 3, and 4. We show how a broad class of such models
exhibit distributions of sphere radii with a universal exponent. We construct a
scaling theory that relates the fractal structure of these models to the decay
of their pore space, a theory that we confirm via numerical simulations. The
scaling theory also predicts an upper bound for the universal exponent and is
in exact agreement with numerical results for d=4.Comment: 6 pages, 5 figures, 4 tables, revtex4 to appear in Phys. Rev. E, May
200
Percolation in suspensions of polydisperse hard rods : quasi-universality and finite-size effects
We present a study of connectivity percolation in suspensions of hard
spherocylinders by means of Monte Carlo simulation and connectedness
percolation theory. We focus attention on polydispersity in the length, the
diameter and the connectedness criterion, and invoke bimodal, Gaussian and
Weibull distributions for these. The main finding from our simulations is that
the percolation threshold shows quasi universal behaviour, i.e., to a good
approximation it depends only on certain cumulants of the full size and
connectivity distribution. Our connectedness percolation theory hinges on a
Lee-Parsons type of closure recently put forward that improves upon the
often-used second virial approximation [ArXiv e-prints, May 2015, 1505.07660].
The theory predicts exact universality. Theory and simulation agree
quantitatively for aspect ratios in excess of 20, if we include the
connectivity range in our definition of the aspect ratio of the particles. We
further discuss the mechanism of cluster growth that, remarkably, differs
between systems that are polydisperse in length and in width, and exhibits
non-universal aspects.Comment: 7 figure
From EMC- and Cronin-effects to signals of quark-gluon plasma
The EMC- and Cronin-effects are explained by a unitarized evolution equation,
where the shadowing and antishadowing corrections are dynamically produced by
gluon fusions. For this sake, an alternative form of the GLR-MQ-ZRS equation is
derived. The resulting integrated and unintegrated gluon distributions in
proton and nuclei are used to analyze the contributions of the initial parton
distributions to the nuclear suppression factor in heavy ion collisions. A
simulation of the fractional energy loss is extracted from the RHIC and LHC
data, where the contributions of the nuclear shadowing and antishadowing
effects are considered. We find a rapid crossover from week energy loss to
strong energy loss at a universal critical energy of gluon jet .Comment: 35 pages, 13 figures, to be published in Int. J. Mod. Phys.
UNCERTAINTY ANALYSIS OF A PIPE MODEL BASED ON CORRELATED DISTRIBUTIONS
Traditionally, uncertainty analysis of complex simulation models has been conducted based on the assumption of that the components of the model are independent. In practice, correlation is universal in ecosystems. This study applied Bayesian estimation and rejection sampling to generate correlated random samples for an uncertainty analysis of a process based forest growth model, a pipe model. Comparison of error budgets built using independent and correlated distributions shows that correlated distributions are very important to provide reasonable and realistic simulation and uncertainty analysis
On the optimality of code options for a universal noiseless coder
A universal noiseless coding structure was developed that provides efficient performance over an extremely broad range of source entropy. This is accomplished by adaptively selecting the best of several easily implemented variable length coding algorithms. Custom VLSI coder and decoder modules capable of processing over 20 million samples per second are currently under development. The first of the code options used in this module development is shown to be equivalent to a class of Huffman code under the Humblet condition, other options are shown to be equivalent to the Huffman codes of a modified Laplacian symbol set, at specified symbol entropy values. Simulation results are obtained on actual aerial imagery, and they confirm the optimality of the scheme. On sources having Gaussian or Poisson distributions, coder performance is also projected through analysis and simulation
Fracture Strength of Disordered Media: Universality, Interactions, and Tail Asymptotics
We study the asymptotic properties of fracture strength distributions of disordered elastic media by a combination of renormalization group, extreme value theory, and numerical simulation. We investigate the validity of the “weakest-link hypothesis” in the presence of realistic long-ranged interactions in the random fuse model. Numerical simulations indicate that the fracture strength is well-described by the Duxbury-Leath-Beale (DLB) distribution which is shown to flow asymptotically to the Gumbel distribution. We explore the relation between the extreme value distributions and the DLB-type asymptotic distributions and show that the universal extreme value forms may not be appropriate to describe the nonuniversal low-strength tail.Peer reviewe
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