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Measurement of the W-boson mass and width with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 7 TeV

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arxiv 2403.15085 v2 pith:C64KFHA7 submitted 2024-03-22 hep-ex

classification hep-ex
keywords measurementw-bosondatamasswidthatlasdetectorfirst
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Proton-proton data recorded by the ATLAS detector in 2011, at a centre-of-mass energy of 7 TeV, have been used for an improved determination of the W-boson mass and a first measurement of the W-boson width at the LHC. Recent fits to the proton parton distribution functions are incorporated in the measurement procedure and an improved statistical method is used to increase the measurement precision. The measurement of the W-boson mass yields a value of $m_W = 80366.5 \pm 9.8 (stat.) \pm 12.5 (syst.)$ MeV = $80366.5 \pm 15.9$ MeV, and the width is measured as $\Gamma_W = 2202 \pm 32 (stat.) \pm 34 (syst.)$ MeV = $2202 \pm 47$ MeV. The first uncertainty components are statistical and the second correspond to the experimental and physics-modelling systematic uncertainties. Both results are consistent with the expectation from fits to electroweak precision data. The present measurement of $m_W$ is compatible with and supersedes the previous measurement performed using the same data.

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