8,520 research outputs found
Determination of the -quark mass from the angular screening effects in the ATLAS -jet shape data
The dependence of jet shapes in events on the -quark mass and
the strong coupling is investigated. To this end, the Pythia Monte Carlo
generator is used to produce samples of events in collisions at
, performing a scan over the values for the shower
QCD scale and the -quark mass . The obtained jet shapes are
compared with recently published data from the ATLAS collaboration. From fits
to the light-jet data, the Monte Carlo shower scale is determined, while the
-quark mass is extracted using the -jet shapes. The result for the mass
of the -quark is .Comment: 16 pages, 10 figures. Version matching the published versio
Influence of the geometry on a field-road model : the case of a conical field
Field-road models are reaction-diffusion systems which have been recently
introduced to account for the effect of a road on propagation phenomena arising
in epidemiology and ecology. Such systems consist in coupling a classical
Fisher-KPP equation to a line with fast diffusion accounting for a road. A
series of works investigate the spreading properties of such systems when the
road is a straight line and the field a half-plane. Here, we take interest in
the case where the field is a cone. Our main result is that the spreading speed
is not influenced by the angle of the cone
Minimal representations of unitary operators and orthogonal polynomials on the unit circle
In this paper we prove that the simplest band representations of unitary
operators on a Hilbert space are five-diagonal. Orthogonal polynomials on the
unit circle play an essential role in the development of this result, and also
provide a parametrization of such five-diagonal representations which shows
specially simple and interesting decomposition and factorization properties. As
an application we get the reduction of the spectral problem of any unitary
Hessenberg matrix to the spectral problem of a five-diagonal one. Two
applications of these results to the study of orthogonal polynomials on the
unit circle are presented: the first one concerns Krein's Theorem; the second
one deals with the movement of mass points of the orthogonality measure under
monoparametric perturbations of the Schur parameters.Comment: 31 page
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