1,093 research outputs found

### Generalized binomial distribution in photon statistics

The photon-number distribution between two parts of a given volume is found
for an arbitrary photon statistics. This problem is related to the interaction
of a light beam with a macroscopic device, for example a diaphragm, that
separates the photon flux into two parts with known probabilities. To solve
this problem, a Generalized Binomial Distribution (GBD) is derived that is
applicable to an arbitrary photon statistics satisfying probability convolution
equations. It is shown that if photons obey Poisson statistics then the GBD is
reduced to the ordinary binomial distribution, whereas in the case of
Bose-Einstein statistics the GBD is reduced to the Polya distribution. In this
case, the photon spatial distribution depends on the phase-space volume
occupied by the photons. This result involves a photon bunching effect, or
collective behavior of photons that sharply differs from the behavior of
classical particles. It is shown that the photon bunching effect looks similar
to the quantum interference effect.Comment: 8 pages, 4 figure

### Stoponium Search at Photon Linear Collider

In some supersymmetric extensions of the Standard Model fairly light
superpartner of t-quark is predicted, which may form bound states ({\it
stoponiums}) under certain conditions. We study prospects of search for
stoponium at the future Photon Linear Collider. It is found that this machine
could be the best machine for discovery and study of these resonances at some
scenarios of supersymmetric extension of the Standard Model. In particular, if
the $hh$ decay channel is dominant stoponium could be observed at the beginning
of PLC run with collision energy tuned at the stoponium mass. If this channel
is kinematically closed stoponium could be discovered in $gg$, $\gamma\gamma$
and $ZZ$ decay channels but higher statistics are needed. Effects of the
stoponium-Higgs mixing and degeneracy are briefly discussed.Comment: 11 pages, 2 figures added, corrections taken into account result in
increasing of signal significanc

### Looking for anomalous gamma-gamma-H and Z-gamma-H couplings at future linear collider

We consider the possibility of studying anomalous contributions to the
gamma-gamma-H and Z-gamma-H vertices through the process e-gamma--> e-H at
future e-gamma linear colliders, with Sqrt(S)=500-1500 GeV. We make a model
independent analysis based on SU(2)xU(1) invariant effective operators of dim=6
added to the standard model lagrangian. We consider a light Higgs boson (mostly
decaying in bar(b)-b pairs), and include all the relevant backgrounds. Initial
e-beam polarization effects are also analyzed. We find that the process
e-gamma--> e-H provides an excellent opportunity to strongly constrain both the
CP-even and the CP-odd anomalous contributions to the gamma-gamma-H and
Z-gamma-H vertices.Comment: LaTeX, 33 pages, 16 eps figures, extended section

### A Quality and Cost Approach for Comparison of Small-World Networks

We propose an approach based on analysis of cost-quality tradeoffs for
comparison of efficiency of various algorithms for small-world network
construction. A number of both known in the literature and original algorithms
for complex small-world networks construction are shortly reviewed and
compared. The networks constructed on the basis of these algorithms have basic
structure of 1D regular lattice with additional shortcuts providing the
small-world properties. It is shown that networks proposed in this work have
the best cost-quality ratio in the considered class.Comment: 27 pages, 16 figures, 1 tabl

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