Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Standard Model Physics II

T 24.3: Talk

Tuesday, March 17, 2026, 16:45–17:00, KH 00.014

Impact of measuring the W boson mass in a combined analysis at several collision energies with the ATLAS experiment — Philip Bechtle¹, •Oliver But¹, Matthias Schott¹, and Chen Wang² — ¹Physikalisches Institut, Universität Bonn — ²Deutsches Elektronen Synchrotron, Hamburg

The precision measurement of the W boson mass is an important consistency test of the standard model. To match the standard model fit uncertainty of the W boson mass of less than 10 MeV all sources of uncertainties have to be carefully controlled. One strategy is to include data taken at multiple proton proton collision energies and fit them simultaneously. As a consequence, systematic effects which act differently for different collision energies decorrelate from the parameter of interest and reduce their impact on the uncertainty.

In this talk, I introduce the concept of correlated parameters and demonstrate how combining a 5 TeV and 13 TeV dataset in the W mass measurement at the ATLAS experiment can help reduce the uncertainty coming from systematics.

Keywords: W Boson; Precision Measurement; ATLAS