Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 103: Top physics 4 (tt+X)

T 103.6: Talk

Thursday, March 7, 2024, 17:15–17:30, Geb. 30.95: Audimax

Prospects for ttW in Run3 — Steffen Korn, •Tobias Moritz, and Arnulf Quadt — II. Physikalisches Institut, Georg-August-Universität Göttingen

The process, where a top-quark anti-top pair is produced in association with a W-boson (ttW), was first observed by ATLAS and CMS in Run 1 of the LHC. First differential cross-section measurements and precision inclusive measurements only became available with Run 2 of the LHC and show some friction between the theory prediction and the measured cross-section.

ttW is one of the heaviest final state that is accessible at the LHC and produced via quark-antiquark annihlation at leading order. The W-boson is emitted by either particle in the initial state. ttW has a relatively small cross-section. Nonetheless, it is an important background for other searches at the LHC, as it is one of the few irreducible sources of same-sign lepton pairs.

In order to prepare for a Run 3 analysis of ttW new MC samples need to be produced corresponding to the higher center-of-mass energy of √s=13.6 TeV and the upgrades to the ATLAS detector. This talk will present ongoing efforts concerned towards a Run 3 analysis.

Keywords: ttW; ATLAS; Run3