Particle Theory Seminars

The particle theory seminars are organized by the Theory Group of the Laboratory for Particle Physics (LTP) at PSI.

The next seminar will take place on Wednesday, December 18, 2024, at 17:00 in WBGB/019

Speaker: Dr. Nils Hermansson-Truedsson (U. Edinburgh)

Title: On some Standard Model precision tests from the muon g-2 and CKM matrix elements

Abstract

In this talk I will discuss low-energy precision tests of the Standard Model, in particular the current status of the muon g-2 and determinations of the light-quark CKM matrix elements |V_{us}| and |V_{ud}|. Starting from my work using various non-perturbative methods in these areas, I will highlight some bottlenecks in future high-precision determinations of processes where hadronic effects are crucial to control. I will also outline some future plans to handle some of the discussed hurdles. 

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The last seminar took place on Thursday, November 28th, 2024, at 11:30 in WBGB/021

Speaker: Dr. Sebastian Eike Pögel (PSI)

Title:  Geometries, Calabi-Yau Manifolds, and Feynman Integrals

Abstract

In studying Feynman integrals "beyond polylogarithms", intricate geometries appear, such as Calabi-Yau manifolds and (hyper)elliptic curves, which dictate the appropriate function spaces for their evaluation. Such geometries play a significant role in integrals relevant to both particle physics and classical gravity. In this talk, I will explore how geometric insights can be extracted from Feynman integrals even before their explicit evaluation. Focusing on Calabi-Yau integrals, I will then discuss techniques for computing these integrals in dimensional regularization, providing a bridge between geometry and physics.