Volume 318 - Corfu Summer Institute 2017 "Schools and Workshops on Elementary Particle Physics and Gravity" (CORFU2017) - Workshop on the Standard Model and Beyond
Measurement of the W-boson mass at the ATLAS experiment
O. Kivernyk
Full text: pdf
Pre-published on: August 22, 2018
Published on: August 24, 2018
Abstract
We present the results of $W$-boson mass measurements with the ATLAS detector at the LHC based on the 2011 data set recorded at a centre-of-mass energy of $\sqrt{s} =7~\text{TeV}$, and corresponding to $4.6~\text{fb}^{-1}$ of integrated luminosity. The selected data sample consists of $7.8\times 10^6$ $W\rightarrow \mu\nu$ candidates and $5.9\times 10^6$ $W\rightarrow e\nu$ candidates. Measurements are performed through template fits to transverse momentum distributions of charged leptons as well as to transverse mass distributions of the $W$ boson in electron and muon decay modes in various kinematic categories. All the individual measurements are found to be consistent and their combination leads to a value of
\begin{eqnarray}
\nonumber m_W &=& 80370 \pm 7~\text{MeV} (\textrm{stat.}) \pm 11~\text{MeV} (\textrm{exp.sys.}) \pm 14~\text{MeV} (\textrm{mod.sys.}) \\
\nonumber &=& 80370 \pm 19~\text{MeV}.
\end{eqnarray}
The measured value of the $W$-boson mass is compatible with the current world average of $m_W = 80385 \pm 15~\text{MeV}$. The uncertainty is competitive with the current most precise measurements performed by the CDF and D0 collaborations.
DOI: https://doi.org/10.22323/1.318.0030
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