# Heavy neutral scalar decays into electroweak gauge bosons in the Littlest Higgs Model

## TL;DR

This paper investigates the decay of a heavy neutral scalar into W bosons within the Littlest Higgs model, estimating decay rates and potential experimental signals at high-energy colliders.

## Contribution

It provides a detailed analysis of the $ ext{Phi}^0 o WW$ decay process at one-loop level in the Littlest Higgs model, with predictions for collider observability.

## Key findings

- Branching ratio for $ ext{Phi}^0 o WW$ is about 10^{-3} for scalar masses 2-4 TeV.
- Estimated production cross section yields around ten events at 1.6 TeV.
- Decay into $ ext{gamma} V$ is highly suppressed and not analyzed in detail.

## Abstract

We study the heavy neutral scalar decays into standard model electroweak gauge bosons in the context of the Littlest Higgs model. We focus our attention on the $\Phi^0 \to WW, \gamma V$ processes induced at the one-loop level, with $V=\gamma, Z$. Since the branching ratios of the $\Phi^0 \to \gamma V$ decays result very suppressed, only the $\Phi^0 \to WW$ process is analyzed in the framework of possible experimental scenarios by using heavy scalar masses between 1.6 TeV until 3.3 TeV. The branching ratio for the $\Phi^0 \to WW$ decay is of the order of $10^{-3}$ throughout the interval 2 TeV $< f <$ 4 TeV, which represent the global symmetry breaking scale of the theory. Thus, it is estimated the associated production cross section for the $pp\to \Phi^0 X\to WW$, finding around ten events for $m_{\Phi^0}\approx 1.6$ TeV at best.