Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 74: Top physics 3 (single top)

T 74.5: Talk

Wednesday, March 6, 2024, 17:00–17:15, Geb. 30.95: Audimax

EFT interpretations of single top quark and Z boson production at the ATLAS experiment with run-2 data — Ian Brock, Nilima Nilesh Akolkar, and •Can Süslü — University of Bonn, Bonn, Germany

Although the Standard model (SM) of particle physics has been successful to explain the observed phenomena, there are indications of new physics beyond the SM, such as dark matter and neutrino oscillations and masses. The Standard Model Effective Field Theory (SMEFT) is a framework for parametrizing the phenomena occuring at the high energies, and contains additional operators in the Lagrangian with dimensions larger than the SM. These operators from a basis, describing all possible interactions and couplings where the new physics can hide.

Single top quark and Z boson production is a convenient channel for EFT interpretations as it contains the couplings of the top quark and W and Z boson, and is thus quite sensitive to many SMEFT operators. In this analysis, using a kinematic distribution, the Wilson coefficients of the dimension six operators sensitive to the tZq channel have been constrained at the detector level via profile likelihood fits. The constraints obtained via the detector-level approach and the further plans for optimizing the EFT-sensitive regions will be presented in this talk.

Keywords: Single top quark; single top quark and Z boson; Effective Field Theory; ATLAS experiment; Run-2 data