Electroweak Interactions of Elementary Particles

(N.Paver) The discovery potential of new accelerators can be theoretically assessed in many different physical processes. This area of research, carried out in international collaborations, has recently focused on the advantages of using polarized beams in a future International Linear Collider (ILC) for electrons and positrons, and on the angular analysis of the production of lepton-antilepton pairs in proton-proton interactions at the CERN Large Hadron Collider (LHC), of particular interest for the possible identification of still unobserved particles such as gravitons, neutral heavy bosons, and sneutrinos.  Also under investigation are ultra-rare decays of tau leptons, which might be observed by a new generation of high-luminosity electron-positron colliders (flavor factories).

(C.Verzegnassi) At the CERN LHC, high-energy proton-proton interactions may result in the production of a pair of particles, with one quark from the third family (single top or single bottom production), and a Higgs or gauge boson or a light quark. These final states are interesting because measurements of their cross-section could provide access to important parameters, both in relation to the Standard Model and to theories of New Physics (Supersymmetry). A precise theoretical prediction of the corresponding observables requires a complete, precise calculation at the "one loop" level in perturbation theory. This computation can then be extended from processes such as single top with W boson and single bottom with neutral Higgs boson, to other processes (single bottom with Z boson). This research is performed in an international collaboration with theoretical physicists from Trieste, Lecce, Montpellier, Copenhagen, the Max Planck Institute, and CERN.


Last update: 09-17-2021 - 18:50