Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 50: Top physics 2 (top pair cross section)

T 50.3: Talk

Tuesday, March 5, 2024, 16:30–16:45, Geb. 30.95: Audimax

tt cross-sections measurement at 13.6 TeV collision energy and its ratio to the 13 TeV result using the ATLAS detector — •Cédrine Alexandra Hügli — DESY, Zeuthen, Germany

The inclusive tt cross-section using proton-proton collisions at 13.6 TeV collision energy using 29 fb⁻¹ of data collected with the ATLAS detector in 2022 is measured. This is achieved through the employment of the b-jet counting method, using events with an opposite-charge electron-muon pair and b-tagged jets. It is interesting to calculate the ratio between this measurement and the 13 TeV result since several uncertainties are correlated. This is particularly true for the theoretical uncertainties. As a consequence, the total uncertainty on the ratio, for measured and predicted values, is smaller than on the individual values. This allows to check the agreement between the measured ratio and the different predictions using various PDF sets. In this talk, the 13.6 TeV measurement and its ratio to the 13 TeV one are presented and the details, how the uncertainty on the ratio is estimated are explained.

Keywords: ttbar; cross-section; 13.6TeV; 2022; ATLAS