711 research outputs found
Phenomenology of minority games in efficient regime
We present a comprehensive study of utility function of the minority game in
its efficient regime. We develop an effective description of state of the game.
For the payoff function g(x)=\sgn (x) we explicitly represent the game as the
Markov process and prove the finitness of number of states. We also demonstrate
boundedness of the utility function. Using these facts we can explain all
interesting observable features of the aggregated demand: appearance of strong
fluctuations, their periodicity and existence of prefered levels. For another
payoff, , the number of states is still finite and utility remains
bounded but the number of states cannot be reduced and probabilities of states
are not calculated. However, using properties of the utility and analysing the
game in terms of de Bruijn graphs, we can also explain distinct peaks of demand
and their frequencies
Study of the Decoherence of Entangled Kaons by the Interaction with Thermal Photons
The KLOE-2 detector is a powerful tool to study the temporal evolution of
quantum entangled pairs of kaons. The accuracy of such studies may in principle
be limited by the interaction of neutral kaons with thermal photons present
inside the detector. Therefore, it is crucial to estimate the probability of
this effect and its influence on the interference patterns. In this paper we
introduce the phenomenology of the interaction of photons with neutral kaons
and present and discuss the obtained quantitative results.Comment: Proceeding from 2nd Young Researchers Workshop: Physics Challenges in
the LHC Era, Frascati, May 10 and 13, 2010; 6 pages, 4 figure
A bound on Planck-scale deformations of CPT from muon lifetime
We show that deformed relativistic kinematics, expected to emerge in a
flat-spacetime limit of quantum gravity, predicts different lifetimes for
particles and their antiparticles. This phenomenon is a consequence of
Planck-scale modifications of the action of discrete symmetries. In particular
we focus on deformations of the action of CPT derived from the kappa-Poincare
algebra, the most studied example of Planck-scale deformation of relativistic
symmetries. Looking at lifetimes of muons and anti-muons we are able to derive
an experimental bound on the deformation parameter of kappa > 4x10^14 GeV from
measurements at the LHC. Such bound has the potential to reach the value of
kappa > 2x10^16 GeV using measurements at the planned Future Circular Collider
(FCC).Comment: 6 pages, 1 figur
Polish grid infrastructure for science and research
Structure, functionality, parameters and organization of the computing Grid
in Poland is described, mainly from the perspective of high-energy particle
physics community, currently its largest consumer and developer. It represents
distributed Tier-2 in the worldwide Grid infrastructure. It also provides
services and resources for data-intensive applications in other sciences.Comment: Proceeedings of IEEE Eurocon 2007, Warsaw, Poland, 9-12 Sep. 2007,
p.44
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