Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 93: Top Physics IV (Misc.)

T 93.3: Vortrag

Freitag, 4. April 2025, 09:30–09:45, VG 1.103

Optimal Observable Machine: The case of four top quark differential cross sections with SMEFT contributions. — •Alejandro Quiroga Trivino¹, Torben Mohr¹, Matteo Defranchis², Jan Kieseler¹, Ankita Mehta², Artur Monsch¹, and Markus Klute¹ — ¹Karlsruhe institute of technology — ²CERN

Identifying optimal observables that are maximally sensitive to Standard Model Effective Field Theory (SMEFT) coefficients, while systematically accounting for uncertainties, is crucial for constraining new physics. This study focuses on developing strategies to determine such observables, with particular attention to minimizing total uncertainties and maximizing sensitivity to SMEFT effects. As a case study, we investigate four-top quark production in proton-proton collisions at a center-of-mass energy of 13.6 TeV. This rare process, characterized by an energetic final state and a tiny cross section, provides a unique testing ground for SMEFT contributions. Specifically, we analyze the effects of a heavy-quark operator with Wilson coefficient ctt1*, employing systematic-aware training to achieve precise constraints in ctt1. This talk will present our approach, highlight progress in identifying optimal variables, and discuss the implications for measuring SMEFT coefficients and uncovering potential new physics.

Keywords: Optimal observables; Top quark; QCD; SMEFT; Collider physics