CZ+SK HEP Workshop 2026

Session

Block 2

10 Sept 2026, 11:00

Academy of Science, Sál Dvořák (Prague)

3. ATLAS Run 3 measurement of inclusive and differential cross sections of boosted ttZ production in the trilepton channel

Dominik Babal (Slovak Academy of Sciences (SK)), Lucia Keszeghova (Comenius University (SK))

10/09/2026, 11:00

Measurements of the associated production of a top-quark pair and a $Z$ boson ($t\bar{t}Z$) probe the coupling between the top quark and the $Z$ boson, thereby serving as indirect searches for new physics. Besides, $t\bar{t}Z$ measurements improve background estimation in some of the direct Beyond the Standard Model searches.
The latest ATLAS $t\bar{t}Z$ cross section measurement at...

17. Jet energy scale and resolution calibration from hadronically decaying W boson in ttbar events in ATLAS

Adriana Dohnalova (Comenius University (SK))

10/09/2026, 11:25

Jet energy scale (JES) and jet energy resolution (JER) uncertainties are among the dominant systematic uncertainties in many ATLAS measurements. After the application of simulation-based calibrations, residual differences between data and simulation are corrected using data-driven in situ techniques. In this contribution, a new in situ calibration approach exploiting $t\bar{t}$ events in the...

30. Charge asymmetry measurement in top-quark pair production using Run2 and partial Run3 data from the ATLAS Experiment

Barbora Eckerova (Comenius University Bratislava), Jiri Hejbal (Czech Academy of Sciences (CZ))

10/09/2026, 11:45

The charge asymmetry is a property of top-quark pair production predicted by the Standard Model which has already been measured at various center-of-mass energies. This analysis would like to follow up on the previous measurement, which observed non-zero charge asymmetry at 4.7 sigma significance level. This effort aims to overcome the previous successful measurement and claim the discovery of...

29. Simultaneous Measurement of the Top-Quark Mass and Decay Width with the ATLAS Experiment

Andrej Durica (Comenius University (SK))

10/09/2026, 12:10

The top quark is the heaviest known fundamental particle, making the precise determination of its properties a critical test of the Standard Model (SM) of particle physics. While the top-quark mass and decay width are closely linked within the SM framework, a simultaneous measurement of both parameters has never previously been performed by the ATLAS experiment. This talk presents the current...