Charged Higgs Observability Through Associated Production With W at a Muon Collider

TL;DR

This study assesses the potential to observe a charged Higgs boson produced with a W boson at future muon colliders within the MSSM, focusing on fully hadronic decay channels and background challenges.

Contribution

It provides a detailed analysis of charged Higgs observability at muon colliders, comparing its potential with e+e- colliders and LHC, highlighting limitations in discovery potential.

Findings

Signal significance is about 1 sigma for tanbeta=50 at 50 fb-1.

Muon collider signals are stronger than e+e- colliders at the same energy.

Muon colliders do not enhance discovery prospects beyond LHC capabilities.

Abstract

The observability of a charged Higgs boson produced in association with a W boson at future muon colliders is studied. The analysis is performed within the MSSM framework. The charged Higgs is assumed to decay to tb and a fully hadronic final state is analyzed, i.e., mu+mu- \rightarrow H\pmW\mp \rightarrow tbW \rightarrow WbbW \rightarrow jjjjbb. The main background is tt production in fully hadronic final state which is an irreducible background with very similar kinematic features. It is shown that although the discovery potential is almost the same for a charged Higgs mass in the range 200 GeV < mH\pm < 400 GeV, the signal significance is about 1sigma for tanbeta = 50 at integrated luminosity of 50 fb-1. The signal rate is well above that at e+e- linear colliders with the same center of mass energy and enough data (O(1 ab-1)) will provide the same discovery potential for all heavy charged Higgs masses up to mH\pm \sim 400 GeV, however, the muon collider cannot add anything to the LHC findings.