Searching for Weak Singlet Charged Scalar at the Large Hadron Collider

TL;DR

This paper investigates the potential for discovering a light weak singlet charged scalar at the LHC, analyzing its interactions, decay modes, and current experimental constraints from LEP and LHC data.

Contribution

It provides a detailed analysis of the allowed parameter space for the singlet charged scalar and proposes strategies for its detection at the LHC.

Findings

A light singlet charged scalar with mass above 65 GeV is still allowed by existing data.

Dominant decay modes of the scalar are identified and characterized.

It is promising to observe this scalar at the LHC with current or future data.

Abstract

Weak singlet charged scalar exists in many new physics models beyond the Standard Model. In this work we show that a light singlet charged scalar with mass above 65~GeV is still allowed by the LEP and LHC data. The interactions of the singlet charged scalar with the Standard Model particles are described by operators up to dimension-5. Dominant decay modes of the singlet charged scalar are obtained, and a subtlety involving field redefinition and gauge fixing due to a dimension-5 operator is also clarified. We demonstrate that it is promising to observe the singlet charged scalar at the LHC.