Academic Background

My academic background is in lattice quantum chromodynamics (lattice QCD), a computational approach to the quantum field theory of strong interactions. It enables the study of these physical systems using numerical algorithms, high-performance computing, and statistical data analysis.

Below is a list of my contributions, including peer-reviewed publications, conference presentations, and posters.

Publications

High-precision continuum limit study of the HVP short-distance window
Authors: Sebastian Spiegel, Christoph Lehner
Journal: Physical Review D 111, 114517 (2025)

This work contributed to the 2025 Muon g-2 Theory Initiative White Paper.

Using supercomputer simulations, we performed the first high-precision, first-principles lattice QCD calculation of the hadronic vacuum polarization (HVP) short-distance window contribution to the muon anomalous magnetic moment $a_\mu = (g-2)/2$. The result directly enters the current Standard Model prediction of $a_\mu$, a key benchmark for precision tests of fundamental particle physics.

HVP SD Comparison
Comparison of lattice QCD determinations of the HVP short-distance window contribution to the muon g-2. The result of our calculation is labeled SL-24. This plot is taken from the 2025 Muon $g-2$ Theory Initiative White Paper
Comparison of HVP short-distance window contributions to the muon $g-2$. The result of our calculation is labeled SL-24.
This plot is taken from the 2025 Muon $g-2$ Theory Initiative White Paper.

Presentations & Posters

Precision charmonium spectroscopy on CLS ensembles: an update
Contributors: G.Bali, S.Collins, W.Söldner, S.Spiegel
Presenter: G.Bali
Lattice 2025, Mumbai, 2025

Pion and kaon decay constants on CLS $N_f = 2 + 1$ ensembles
Contributors: G.Bali, S.Collins, J.Heitger, S.Kuberski, M.Pröbstl, W.Söldner, S.Spiegel
Poster
Lattice 2025, Mumbai, 2025

A high-precision continuum limit study of the HVP short-distance window
Contributors: S.Spiegel, C.Lehner
Presenter: S.Spiegel
Lattice 2024, Liverpool, 2024

Precision charmonium spectroscopy on CLS ensembles
Contributors: G.Bali, S.Collins, W.Söldner, S.Spiegel
Presenter: G.Bali
Lattice 2024, Liverpool, 2024