Speaker
Description
This study presents a search for a new vector gauge boson $Z'$ predicted by the $L_{\mu}-L_{\tau}$
model with the ATLAS detector at the Large Hadron Collider.
The search is carried out in the final state with four muons (4$\mu$), using full data-set collected in Run 2 in pp collisions at $\sqrt s$ = 13 TeV, corresponding to an integrated luminosity of 139 fb$^{-1}$. A deep learning Neutral Networks classifier is used to
separate the $Z'$ signal from the Standard Model background events. The di-muon invariant masses paired in the $4\mu$ events are used to extract the $Z'$ resonance signature. No significant data excess is observed over the predicted background.
Upper limits at 95\% confidence level are set on the production cross-section times the decay branching fraction of $pp \rightarrow Z'\mu\mu \rightarrow 4\mu$, and on the coupling strength of the $Z'$ boson to $\mu$, $\tau$, $\nu_{\mu}$ and $\nu_{\tau}$.
| In-person participation | No |
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