LHC Data and Aspects of New Physics

TL;DR

This paper analyzes how current LHC data constrains models of new physics with strongly interacting sectors, focusing on bosonic technicolor and the role of vector bosons in fitting experimental results.

Contribution

It introduces a parametrization of the interaction Lagrangian for strongly interacting theories and examines the impact of vector bosons with different coupling scenarios on data fit quality.

Findings

Vector bosons mixing with electroweak gauge fields have minimal impact on data fit.

Direct couplings of vector bosons to the Higgs improve the fit significantly.

A two Higgs doublet model effectively describes the scalar sector in these theories.

Abstract

We consider the implications of current LHC data on new physics with strongly interacting sector(s). We parametrize the relevant interaction Lagrangian and study the best fit values in light of current data. These are then considered within a simple framework of bosonic technicolor. We consider first the effective Lagrangian containing only spin-0 composites of the underlying theory, which corresponds to a two Higgs doublet model. With respect to this baseline, the effects of the vector bosons, a staple in strong interacting theories, are illustrated by considering two cases: first, the case where the effects of the vector bosons arise only through their mixing with the electroweak SU(2)_L gauge fields and, second, the case where also a direct interaction term with neutral scalars exists. We find that the case of a W' coupling to the Higgs boson only via the mixing of vector fields produces a negligible improvement in the fit of the present data, while even a small direct coupling of the composite vector fields to the Higgs allows the tested model to fit optimally the experimental results.