Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series LPTHE-PPH
Subjects hep-ph
Date Tuesday 4 April 2023
Time 14:00
Institute LPTHE
Seminar Room library & Zoom link in comments
Speaker's Last Name Hirschi
Speaker's First Name Valentin
Speaker's Email Address
Speaker's Institution University of Bern
Title Fully numerical perturbative QFT computations with Local Unitarity
Abstract 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.
arXiv Preprint Number
Comments Join Zoom Meeting https://cern.zoom.us/j/63419535770?pwd=WlpoNnF1M2xOY2cyM0tzSXZCdWFtQT09 Meeting ID: 634 1953 5770 Passcode: 387151
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