Nuclear Seminar - Adriana Dohnalová (10.12.2025)

Wednesday 10.12.2025 at 14:00, Lecture room F1/364

04. 12. 2025 12.40 hod.
By: Jaroslav Staníček

Mgr. Adriana Dohnalová:
Jet energy scale and resolution calibration from hadronic W boson decay in top-antitop quark pair production events

Abstract:
Searches for BSM processes, as well as SM measurements, often involve jets in their final states. Consequently, precise jet measurements are essential for many ATLAS analyses, and jet-calibration–related systematic uncertainties are among the dominant ones. To bring the reconstructed jet momentum as close as possible to its true value, a sequence of calibrations is applied, ending in in situ calibrations that correct the residual differences between data and simulation. These in situ correction factors are derived using a well-calibrated reference object recoiling against the jets.

In this talk, I will present a new measurement that exploits top-antitop quark pair production events in the single-lepton decay channel, where one W boson decays into two jets. The resulting correction factors will be combined with existing in situ calibrations to further improve the precision of the ATLAS jet energy scale and resolution.