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 KinoshitaLeeNauenberg (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 |
Attachments |
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