Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 24: Standard Model Physics II
T 24.2: Vortrag
Dienstag, 17. März 2026, 16:30–16:45, KH 00.014
Measuring the W Mass with the ATLAS low-⟨µ ⟩ Dataset — •Mathias Backes — Heidelberg University
The measurement of the mass of the W-boson is one of the fundamental tests of the Standard Model.
ATLAS (2024) and CMS (2024) published measurements presenting results for the W-mass which are in agreement with the Standard Model.
These measurements are in more than 5σ tension with the value obtained by the CDF collaboration (2022).
In order to investigate this tension ATLAS is currently performing an additional measurement.
The W mass is most accurately measured using the leptonic decay channel W→ lνl with l ∈ (e, µ).
The low-pileup dataset of ATLAS (taken in Run-2) is especially useful because a central aspect of this analysis is the precise estimation of the hadronic recoil to infer the energy and direction of the neutrino.
Since the W mass cannot be measured directly it has to be inferred through comparisons with Monte Carlo simulations in a Profile Likelihood Fit.
In this talk the current status of the analysis including the details of the Profile Likelihood Fit is presented.
Keywords: W Mass; Profile Likelihood Fit