New Higgs interactions and recent data from the LHC and the Tevatron

TL;DR

This paper conducts a comprehensive, model-independent analysis of Higgs boson data from LHC and Tevatron, revealing potential deviations from the Standard Model in couplings, phases, and invisible decay modes.

Contribution

It introduces a seven-parameter global fit allowing for independent deviations in Higgs couplings, phases, and invisible decay, providing new insights into possible physics beyond the Standard Model.

Findings

Couplings can significantly differ from Standard Model predictions.

A non-zero phase in top-quark coupling has notable implications.

The Higgs invisible branching ratio could be sizable.

Abstract

We perform a multi-parameter global analysis of all data available till date from the ATLAS, CMS and Tevatron experiments, on the signals of a Higgs boson, to investigate how much scope exists for departure from the standard model prediction. We adopt a very general and model-independent scenario, where separate deviations from standard model values are possible for couplings of the observed scalar with up-and down-type fermions, W-and Z-boson pairs, as well as gluon and photon pair effective interactions. An arbitrary phase in the coupling with the top-pair, and the provision for an invisible decay width for the scalar are also introduced. After performing a global fit with seven parameters, we find that their values at 95% confidence level can be considerably different from standard model expectations. Moreover, rather striking implications of the phase in top-quark coupling are noticed. We also note that the invisible branching ratio can be sizeable, especially when the couplings of the Higgs to W-and Z-pairs are allowed to be different.