Abstract
The correlation of on- and off-shell Higgs boson production at the LHC in gg→h⁎→ZZ has been used to bound the Higgs width. We propose an alternative complementary constraint which is only possible through the combination of LEP and LHC measurements. Precision electroweak measurements at LEP allow for the determination of indirect constraints on Higgs couplings to vector bosons by considering one-loop processes involving virtual Higgs exchange. As the indirect constraint is model dependent we will consider two specific models which modify the Higgs couplings and width, and our results will apply specifically to these models. By combining these LEP constraints with current LHC 8 TeV Higgs measurements a stronger limit on the Higgs width can be achieved than with LHC data alone. Looking to the future, a more robust constraint can be achieved by correlating LEP measurements with WBF Higgs production followed by Higgs decays to WW and ZZ. We will discuss the model dependence of this method in comparison to other proposed methods.
Highlights
The discovery of the Higgs boson [1,2,3] marked a new era of exploration in fundamental physics
We have shown that including off-shell Higgs boson coupling constraints from Large Electron Positron Collider (LEP), as performed by e.g. [14], adds important complementary information in the interpretation of LHC Higgs measurements
Bearing in mind certain theoretical issues that can arise if new physics does not follow an Standard Model (SM)-pattern [7,8], we have categorised the constraints into groups with varying degree of dependence on additional Higgs couplings
Summary
The discovery of the Higgs boson [1,2,3] marked a new era of exploration in fundamental physics. C. Englert et al / Nuclear Physics B 902 (2016) 440–457 mass and individual decay widths, as well as detailed information on the coupling magnitudes and Lorentz structures. Our work takes a different approach and uses the indirect Higgs coupling constraints determined from the LEP results in correlation with LHC Higgs measurements to constrain free parameters in specific models. We organise this work as follows: First we review recent attempts to set limits on the total Higgs width at the LHC in Sec. 2 and argue further in Sec. 3 that for certain specific models LEP can be considered a superior off-shell Higgs constraint.
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