Limits on Anomalous Couplings of the Higgs to Electroweak Gauge Bosons from LEP and LHC

TL;DR

This paper investigates how new physics could alter Higgs couplings to electroweak bosons, using LEP and LHC data to set limits and explore implications for supersymmetry and extra dimensions.

Contribution

It provides new combined limits on anomalous Higgs couplings, including rare decay channels, and explores their implications for supersymmetry and warped extra-dimensional models.

Findings

Stronger limits on Higgs to photon-Z decay from combined LEP and LHC data.

Constraints on supersymmetric staus with large mixing.

Bounds on radion mass and interaction scale in warped extra-dimensional models.

Abstract

In this paper we assume the Higgs is an elementary scalar, and study how new physics could affect its couplings to electroweak gauge bosons. Adding LHC data to LEP data provides new, more stringent limits, particularly when the Higgs to two photon decay signal strength is taken into account. We then study the effect of anomalous angular correlations in the decay to WW*. We obtain a new limit on the rare decay to photon-Z, and use it to constrain Supersymmetry, to find that staus with large mixing would be most sensitive to this channel. We also use these limits to constrain radion exchange in Warped Extra-Dimensions, finding a limit on the radion mass and interaction scale of the order of TeV. Finally, we have extrapolated the current data to obtain prospects for the full 2012 dataset.