# ICHEP 2022

Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

## Search for a new gauge boson $Z'$ in $4\mu$ events with the ATLAS experiment

Jul 8, 2022, 7:05 PM
1h 25m
Bologna, Italy

#### Bologna, Italy

Palazzo della Cultura e dei Congressi
Poster Beyond the Standard Model

### Speaker

Zhe Yang (Umich & USTC)

### 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

### Primary authors

Shuzhou Zhang (Umich) Zhe Yang (Umich & USTC)

### Presentation materials

 yangz_lowm_zp_ichep_2022.pdf yangz_lowm_zp_ichep_2022_present.mp4