Speaker
Description
The measurement of the production of a $W$ boson with a $c$ quark (termed ''$W + c$ analysis'') is studied with the ATLAS detector using the full Run 2 dataset of $pp$ collisions at $\sqrt{s} = 13 \; \mathrm{TeV}$. This measurement is crucial in obtaining increasingly precise values of the $s$ and $\bar{s}$ parton distribution function (PDF) of the proton, as well as studying the physics of the charm quark. One of the decay modes through which $W + c$ analysis can be performed is the so-called ``Satellite" mode, where a $D^{*}$ decays according to: $D^* \rightarrow \pi D^0 \rightarrow \pi(K \pi \pi^0)$, and a W boson decays leptonically. We present the measurement of the cross section of $W^+ + D^{*-}$,$W^- + D^{*+}$, and the ratio of these cross sections $R^\pm _c (WD^*)$ using the Satellite mode in $pp$ collisions at $\sqrt{s} = 13 \; \mathrm{TeV}$. Specifically, we measure the scaling factor $\mu$ (which scales Standard Model predictions to observed data) for each charged lepton channel to be: $\mu(e^-) : 1.15 \pm 0.07$, $\mu(e^+) : 1.08 \pm 0.07$, $\mu(\mu^-) : 1.11 \pm 0.07$, and $\mu(\mu^+) : 1.06 \pm 0.09$. Additionally, we calculate a first pass value of $R^\pm _c (WD^*)$ to be 0.92, and we bound the uncertainty on this ratio to be $\sigma( R^\pm _c (WD^*)) < 0.06$.
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