Séminaire par P. skands
Hadron Collisions, Heavy Particles, and Hard Jets
résume :
The production of very heavy particles at colliders like the Tevatron
and LHC involve huge momentum transfers between incoming quarks and
gluons. These violent accelerations occurring between coloured
particles, there will be a large probability for extra hard QCD
bremsstrahlung, that is, extra hard jet radiation. Because hadron
collider experiments utilize hard jets as a means to discriminate
between different signals, and to reconstruct event kinematics, the
understanding of these processes is crucial. Specifically, we will
consider the production of top pairs at the Tevatron and LHC, and, after
a brief introduction to supersymmetry, the production of squarks and
gluinos at the LHC. By comparing results from fixed-order perturbation
theory, obtained with the new SUSY MadGraph, to various parton shower
models, from the PYTHIA Event Generator, we quantify how big these
bremsstrahlung cross sections are, and how well they are modeled by
different approximations. Depending on time and interest, other aspects
of hadron collider physics, such as the underlying event, may also be
touched on.