Sara Ditsch
I am a PhD student in theoretical physics at the Max Planck Institute for Physics, supervised by Johannes Henn (MPP) and Lorenzo Tancredi (TUM). I studied physics in Heidelberg, Cambridge and Munich and completed my M.Sc. at TUM with an IMPRS fellowship. My research focuses on multi-loop scattering amplitudes and Feynman integrals: I use positivity properties such as complete monotonicity and Stieltjes properties to constrain and approximate Feynman integrals, and I compute the QCD amplitudes needed for precision predictions of top-quark pair production in association with a W boson (tt̄W) at the LHC. I also enjoy communicating physics to a broad audience, for example in public talks at Café & Kosmos and at the MPP open day.
Research
Scattering amplitudes and Feynman integrals, Positivity properties of Feynman integrals (complete monotonicity, Stieltjes functions) and their use for bounds and approximations, Multi-loop QCD amplitudes for tt̄W production, Precision predictions for LHC physics
Publications
- M. Becchetti, D. Canko, X. Chen, V. Chestnov, M. Delto, S. Ditsch, T. Peraro, M. Pozzoli, C. Savoini, S. Zoia, Two-loop QCD amplitudes for tt̄W production at the LHC in the leading-colour approximation, arXiv:2608.03746 [hep-ph]. https://arxiv.org/abs/2608.03746
- S. Ditsch, J. M. Henn, P. Raman, Approximating Feynman integrals using complete monotonicity and Stieltjes properties (proceedings), PoS LL2026 (2026) 039, arXiv:2606.27101. https://doi.org/10.22323/1.521.0039
- M. Becchetti, D. Canko, X. Chen, V. Chestnov, M. Delto, S. Ditsch, M. Grazzini, S. Kallweit, T. Peraro, M. Pozzoli, C. Savoini, L. Tancredi, S. Zoia, NNLO QCD predictions for tt̄W production at hadron colliders, arXiv:2606.09503 [hep-ph]. https://arxiv.org/abs/2606.09503
- S. Ditsch, J. M. Henn, P. Raman, Approximating Feynman integrals using complete monotonicity and Stieltjes properties, JHEP 05 (2026) 122, arXiv:2512.18499. https://doi.org/10.1007/JHEP05(2026)122
- M. Becchetti, M. Delto, S. Ditsch, P. A. Kreer, M. Pozzoli, L. Tancredi, One-loop QCD corrections to ūd → tt̄W at O(ε²), JHEP 09 (2025) 126, arXiv:2502.14952. https://doi.org/10.1007/JHEP09(2025)126
- S. Ditsch, T. Haas, Entropic distinguishability of quantum fields in phase space, Quantum 8 (2024) 1414, arXiv:2307.06128. https://doi.org/10.22331/q-2024-07-17-1414
