Implications of gauge symmetry for precision Higgs physics
by
Leonardo Pedro(CFTP (Lisboa) /University of Graz)
→
Portugal
LIP seminar room
LIP seminar room
Description
The Higgs mechanism was inspired by phenomena in solid state physics.
By then it was already known that strictly speaking, there is no spontaneous
breaking of a (local) gauge symmetry. This implies that in the Standard Model, the Higgs field is part of the structure of leptons and hadrons.
The composition of the (physical, gauge-invariant) electrons and protons in terms of the gauge-dependent elementary fields is described by the parton distribution functions (PDFs), including the Higgs PDFs. The successful predictions of the Standard Model at the LHC use a mean-field approximation to estimate the Higgs PDFs. The artificial breaking of symmetries is a common feature of mean-field approximations in particle, nuclear and solid-state physics and this explains why the Higgs mechanism is related to spontaneous symmetry breaking. In nuclear and solid-state physics there are several methods to improve the mean-field approximations. In particle physics, such approximation to the Higgs PDFs can be improved using a combination of experimental data and lattice simulations.
We will discuss 5 physical processes at colliders which are sensible to the Higgs PDFs.
Vydio meeting room: https://vidyoportal.cern.ch/join/ekkljdvTj8Sr
