نتایج جستجو برای: ecfa

تعداد نتایج: 56  

2000
C. Peña-Garay,

We review the status of neutrino masses and mixings in the light of the solar and atmospheric neutrino data. The result from the LSND experiment is also considered. We discuss the present knowledge and the expected sensitivity to the neutrino mixing parameters in the simplest schemes proposed to reconcile these data some of which include a light sterile neutrino in addition to the three standar...

2000
S. Moretti,

The new version [1] of the HERWIG event generator [2] allows one to simulate hadronic final states in electron-positron annihilations using the O(αs) partonic matrix elements (MEs) for ee → qq̄gg and ee → qq̄QQ̄. The consequent phenomenology is discussed in the case of four-jet signatures of particular relevance to future electron-positron Linear Colliders (LCs), such as in Higgs boson searches. T...

2008
Tim Gershon,

Flavour will play a crucial role in understanding physics beyond the Standard Model. Progress in developing a future programme to investigate this central area of particle physics has recently passed a milestone, with the completion of the conceptual design report for SuperB, a very high luminosity, asymmetric ee collider. This article summarizes the important role of SuperB in understanding ne...

1999
S. Moretti,

The process ee → Htt̄ can be exploited at future Linear Colliders (LCs) [1]–[2] to measure the Higgs-top Yukawa coupling. In this note, we estimate the size of the irreducible backgrounds in the channel Htt̄ → bb̄bb̄WW → bb̄bb̄l±νl qq̄, for the case of a Standard Model (SM) Higgs boson with mass between 100 and 140 GeV. 1. Interplay of signal and backgrounds Higgs-strahlung off top-antitop pairs [3] i...

1999
S. Moretti,

The calculation of the tree-level QCD processes ee → qq̄gggg, qq̄qq̄gg and qq̄qq̄qq̄ has recently been accomplished. We highlight here the relevance of such reactions for some of the physics at future electron-positron linear accelerators. 1. Motivations for an exact calculation of e+e− → 6 partons As accelerator physics will enter the Linear Collider (LC) epoch [1, 2], one will encounter a long seri...

2004
Ezio Maina, Stefano Moretti, Douglas A. Ross,

We briefly illustrate the impact of the genuinely weak one-loop virtual terms of the O(αSαEW) factorisable corrections to the three-jet cross section at √ s = MZ . Their importance for the measurement of αS at GigaZ luminosities is emphasised. 1 Three-jets events at leptonic colliders In the case of ee annihilations, the most important QCD quantity to be extracted from multi-jet events is αS. T...

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