Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Série LPTHE-PPH
Domaines hep-ph
Date Mardi 4 Avril 2023
Heure 14:00
Institut LPTHE
Salle library & Zoom link in comments
Nom de l'orateur Hirschi
Prenom de l'orateur Valentin
Addresse email de l'orateur
Institution de l'orateur University of Bern
Titre Fully numerical perturbative QFT computations with Local Unitarity
Résumé It is well-known that perturbative expansions of QFT observable suffer from infrared (IR) divergences both in the phase-space of real-emission contributions and in the loop amplitudes of virtual contributions. Traditionally, the two are handled separately through a combination of local subtraction counterterm and dimensional regulation. Local Unitarity is an alternative formulation using the Loop-Tree Duality (LTD) theorem and where the Kinoshita–Lee–Nauenberg (KLN) cancellation pattern is leveraged to achieve a direct cancellation of real-emission and loop IR divergences at the local level. Together with an automated local renormalization procedure based on the R-operation, the resulting expression is locally finite and thus amenable to numerical integration at arbitrary perturbative orders and for processes with final-state singularities only. I will present an overview of the various ingredients entering that construction and the challenges awaiting my new group at the University of Bern.
Numéro de preprint arXiv
Commentaires Join Zoom Meeting https://cern.zoom.us/j/63419535770?pwd=WlpoNnF1M2xOY2cyM0tzSXZCdWFtQT09 Meeting ID: 634 1953 5770 Passcode: 387151
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