# Search for the production of W$^\pm$W$^\pm$W$^\mp$ events at $\sqrt{s} =$ 13 TeV

## TL;DR

This paper reports a search for triple W boson production in proton-proton collisions at 13 TeV, using CMS data, and sets limits on anomalous couplings and axion-like particles, with no significant signal observed.

## Contribution

First search for W$^"+$W$^"+$W$^"-$ production at 13 TeV, providing experimental limits on anomalous gauge couplings and axion-like particles.

## Key findings

- Observed significance of 0.60 sigma, below the expected 1.78 sigma.
- Measured signal yield ratio of 0.34 with large uncertainties.
- Set limits on anomalous quartic gauge couplings and axion-like particles.

## Abstract

A search for the production of events containing three W bosons predicted by the standard model is reported. The search is based on a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC and corresponding to a total integrated luminosity of 35.9 fb$^{-1}$. The search is performed in final states with three leptons (electrons or muons), or with two same-charge leptons plus two jets. The observed (expected) significance of the signal for W$^\pm$W$^\pm$W$^\mp$ production is 0.60 (1.78) standard deviations, and the ratio of the measured signal yield to that expected from the standard model is 0.34 $^{+0.62}_{-0.34}$. Limits are placed on three anomalous quartic gauge couplings and on the production of massive axionlike particles.