Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 103: Top physics 4 (tt+X)

T 103.7: Talk

Thursday, March 7, 2024, 17:30–17:45, Geb. 30.95: Audimax

Reinterpretation of the recent ATLAS ttW measurement in the framework of the SMEFT — Marcel Niemeyer, Arnulf Quadt, Baptiste Ravina, Elizaveta Shabalina, and •Sreelakshmi Sindhu — II. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

The Standard Model Effective Field Theory (SMEFT) provides a model independent approach to study beyond the Standard Model effects. A search for new physics using the framework of the SMEFT is performed using events with one or two top quarks in association with a boson (ttW, ttZ, tZ, ttH, tH). The simultaneous analysis of these processes gives the opportunity to constrain a large number of dimension six SMEFT operators.

In this analysis, final states with two same sign or three isolated leptons are selected and classified into various regions based on the number of leptons, jets, b-jets and the total charge of the leptons. Using the event yields in these regions, limits are extracted on the SMEFT operators. This measurement is performed using the proton-proton collision data at √s =13 TeV with an integrated luminosity of 139 fb⁻¹, recorded from 2015 to 2018 with the ATLAS experiment at the Large Hadron Collider at CERN.

Keywords: EFT; Top quark; ATLAS experiment