Impacts of the bounds on the Higgs mass and m_W on effective theories

TL;DR

This paper explores how experimental bounds on the Higgs mass and W boson mass influence effective theories, showing that new physics operators can significantly alter these bounds and allow for a heavier Higgs.

Contribution

It demonstrates that dimension-6 operators in effective Lagrangians can modify Higgs mass bounds derived from electroweak precision measurements.

Findings

Higgs mass bounds can be significantly altered by new physics operators.

A Higgs mass up to 700 GeV is compatible with a 1 TeV scale of new physics.

Effective parameters are sensitive to the presence of dimension-6 operators.

Abstract

We study the inter-relations that exist between the present experimental bounds on the Higgs mass, as obtained from radiative corrections to $m_W$, and the effective parameters, $\alpha_i$ and $\Lambda$. We find that the SM bounds on $m_H$, arising from a precise determination of the $m_W$ mass, can be substantially modified by the presence of dimension-6 operators which appear in the linear realization of the effective Lagrangian approach. A Higgs mass as heavy as 700 GeV can be allowed for scales of new physics of the order of 1 TeV.