Lattice QCD measurement of the strong coupling constant
- Event time: 2:00pm
- Event date: 22nd February 2012
- Speaker: Benoit Blossier (Universite Paris-Sud)
- Location: Lecture Theatre C, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
It is crucial to well estimate at high energy colliders like LHC the detectors sensitivity to Higgs boson production as a function of its mass. In addition to the hadronic uncertainty, coming from the parametrisation of parton distribution functions or the dependence on the factorisation scale, one has to take into account an error on the strong coupling constant itself. It is hence worth developing theoretical methods to compute it. In this talk we will present the status of its determination from ab-initio numerical simulations: after a description of the methods based on hadronic schemes and finite volume schemes, we will emphasize a fixed-gauge approach of extracting alpha_s from ghost and gluon Green functions analysis.
The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..