Results 1 - 10 of 30205
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[en] The relativistic solitary wave propagation is studied in cold electron-positron plasma embedded in an external arbitrary strong magnetic field. The exact, analytical soliton-like solution corresponding to a localized, purely electromagnetic pulse with arbitrary big amplitude is found. (author). 7 refs, 1 fig
[en] We briefly sketch the methods for a numerically stable evaluation of tensor one-loop integrals that have been used in the calculation of the complete electroweak one-loop corrections to e+e-->4 fermions. In particular, the improvement of the new methods over the conventional Passarino-Veltman reduction is illustrated for some 4-point integrals in the delicate limits of small Gram (and other kinematical) determinants
[en] The methods to produce positrons and positronium are shortly reviewed. Different sources for positrons are compared. Implantation, diffusion and emission of positrons and some typical moderators are discussed. Special consideration is given to accelerator based sources, to the design of conversion targets, to the conversion efficiency and to the problems of thermal power dissipation. Finally the possible accumulation of large numbers of positrons by using pulsed accelerators is outlined
[en] We present the second in a series of studies into the forward tracking system for a future linear e+e− collider with a center-of-mass energy in the range from 250 GeV to 3 TeV. In this note a number of specific challenges are investigated, which have caused a degradation of the tracking and vertexing performance in the forward region in previous experiments. We perform a quantitative analysis of the dependence of the tracking performance on detector design parameters and identify several ways to mitigate the performance loss for charged particles emitted at shallow angle.