Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 23: Top Physics I
T 23.3: Talk
Tuesday, March 17, 2026, 16:45–17:00, KH 00.011
NNLO soft function for 0-jettiness in (associated) tt production — Guido Bell1, Alessandro Broggio2, •Sebastian Edelmann1, Matthew A. Lim3, and Rudi Rahn2 — 1Theoretische Physik 1, Center for Particle Physics Siegen, Universität Siegen, Germany — 2Faculty of Physics, University of Vienna, Austria — 3Leonardo UK, Luton LU1 3PG, United Kingdom
Given the exceptional precision of LHC data, a detailed theoretical understanding of tt and ttX cross sections, where X = γ, W, Z, H, is required to better probe the top and the Higgs sectors of the Standard Model and search for new physics.
One promissing method to achieve precise QCD calculations is N-jettiness slicing. It was shown that the tt production cross section factorizes into hard, beam and soft functions at small values of the 0-jettiness variable. At NNLO only the relevant soft functions are currently missing for processes with two heavy quarks in the final state. By extending the SoftSERVE program to incorporate massive final-state partons, we were able to automate the numerical computation of the renormalized tt soft function for various observables and verify its pole structure using the renormalization group equation.
The produced grids can be used to implement associated tt production processes in the Monte-Carlo event generator GENEVA.
Keywords: Factorization; Soft-collinear effective theory; Soft function; Top quarks