Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 18: Methods in Particle Physics I (Calo, Jets, Tagging)

T 18.3: Vortrag

Montag, 31. März 2025, 17:15–17:30, VG 4.101

In-Situ Calibration of Small-Radius Jets Using the MPF Method with γ+jets Events in ATLAS — •Simone Ruscelli and Chris M. Delitzsch — Technische Universität Dortmund (Germany)

The V+jets calibration is a pivotal component of the in-situ jet calibration in ATLAS to correct for differences in the jet energy scale between data and Monte Carlo simulation due to the imperfect simulation of e.g. the detector materials, pile-up and jet formation. This presentation focuses on the γ+jets calibration of small-radius (R=0.4) jets, reconstructed from particle flow objects, using data collected with the ATLAS detector during Run 2. The Missing-E_T Projection Fraction (MPF) technique is used, which takes into account the full hadronic recoil in an event as opposed to the Direct Balance (DB) method, which only considers the balancing jet. The MPF method has numerous advantages, e.g. it is not strongly affected by the jet definition and is also robust to both pile-up and the underlying event.

Keywords: Small-radius jets; V+jets; MPF method; In-situ calibration; particle flow objects