Constraints on New Scalars from the LHC 125 GeV Higgs Signal

TL;DR

This paper analyzes how recent LHC Higgs data constrains models with new scalar particles, focusing on their production and decay effects, and distinguishing their properties based on color and charge.

Contribution

It provides a detailed study of scalar effects on Higgs signals, considering color and decoupling, and proposes methods to identify the nature of new scalars from experimental data.

Findings

Diphoton and vector boson channels constrain scalar parameters.

Color and charge of scalars can be disentangled from Higgs measurements.

Results help identify properties of potential new scalar particles.

Abstract

We study the implications the recent results from the LHC Higgs searches have on scalar new physics. We study the impact on both the Higgs production and decay from scalars with and without colour, and in cases where decoupling do and do not happen. We investigate possible constraints on scalar parameters from the production rate in the diphoton channel, and also the two vector boson channels. Measurements from both channels can help disentangle new physics due to colour from that due to charge, and thus reveal the nature of the new scalar states.