6,660 research outputs found
Performance of the LiF-TEA Ring Imaging Cherenkov Detector at CLEO
We describe the particle identification capability of the CLEO RICH system.
This system consists of a 1 cm thick LiF radiator coupled to a photon detector
that uses wire proportional chambers filled with a mixture of CH and TEA.
We discuss the yield of photoelectrons observed per ring and the angular
resolution. We show the efficiencies achieved for particle identification and
the associated fake rates from data collected with both CLEO III and CLEO-c
detectors. Finally we show examples of the particle separation ability which is
excellent for both CLEO III and CLEO-c data.Comment: Invited talk given at the fifth International Workshop on Ring
Imaging Cherenkov Counters(RICH), Playa del Carmen, Mexico, 2004. (6 pages, 7
figures). To be published in the Nucl. Inst. and Methods
Recycling Parrondo games
We consider a deterministic realization of Parrondo games and use periodic
orbit theory to analyze their asymptotic behavior.Comment: 12 pages, 9 figure
The BTeV RICH Front End Electronics
We report on the design and testing of novel mixed analog and digital front
end ASICs custom made for the single photon detectors considered for the BTeV
RICH system. The key features are reviewed, as well as results achieved using
electronics bench tests and beam studies.Comment: 7 pages, 4 figures, talk given at the 5th International Workshop on
Ring Imaging Cherenkov Counters (RICH2004
Present status of our knowledge of |V_{cb}|
The Cabibbo-Kobayashi-Maskawa parameter plays an important role
among the experimental constraints of the Yukawa sector of the Standard Model.
The present status of our knowledge will be summarized with particular emphasis
to the interplay between theoretical and experimental advances needed to
improve upon present uncertainties.Comment: 12 pages, 2 figures; talk given at Beauty 2003, Pittsburgh, PA,
October 200
B Physics in the Next Millennium
As we approach the turn of the century, the Standard Model is still
consistent with all our experimental observations and the path to a more
complete picture of the fundamental constituents and their interactions has yet
to be clearly identified. Beauty flavored hadrons have provided crucial
experimental information on several fundamental parameters of the Standard
Model and may lead to one of the most challenging test of its validity and
provide some clues on the path towards a more complete theory. Several
experiments will try to explore this rich phenomenology in the next few years.
Their physics goals and discovery potential will be compared.Comment: 11 pages, 4 Figures, Talk given at HQ98, Batavia, Il, October 199
Fractal diffusion coefficient from dynamical zeta functions
Dynamical zeta functions provide a powerful method to analyze low dimensional
dynamical systems when the underlying symbolic dynamics is under control. On
the other hand even simple one dimensional maps can show an intricate structure
of the grammar rules that may lead to a non smooth dependence of global
observable on parameters changes. A paradigmatic example is the fractal
diffusion coefficient arising in a simple piecewise linear one dimensional map
of the real line. Using the Baladi-Ruelle generalization of the
Milnor-Thurnston kneading determinant we provide the exact dynamical zeta
function for such a map and compute the diffusion coefficient from its smallest
zero.Comment: 8 pages, 2 figure
On the decay of correlations in Sinai billiards with infinite horizon
We compute the decay of the autocorrelation function of the observable
in the Sinai billiard and of the observable in the associated
Lorentz gas with an approximation due to Baladi, Eckmann and Ruelle. We
consider the standard configuration where the disks is centered inside a unit
square. The asymptotic decay is found to be . An explicit
expression is given for the prefactor as a function of the radius of the
scatterer. For the small scatterer case we also present expressions for the
preasymptotic regime. Our findings are supported by numerical computations.Comment: 6 pages LaTeX, 5 postscript figure
Comment on "Lyapunov statistics and mixing rates for intermittent systems"
In Pires {\it et al.} [Phys. Rev. E 84, 066210 (2011)] intermittent maps are
considered, and the tight relationship between correlation decay of smooth
observables and large deviations estimates, as for instance employed in Artuso
and Manchein [Phys. Rev. E 80, 036210 (2009)], is questioned. We try to clarify
the problem, and provide rigorous arguments and an analytic estimate that
disprove the objections raised in Pires {\it et al.} [Phys. Rev. E 84, 066210
(2011)] when ergodic systems are considered.Comment: 3 page
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