Combining LEP and LHC to bound the Higgs width

Englert, C. , McCullough, M. and Spannowsky, M. (2016) Combining LEP and LHC to bound the Higgs width. Nuclear Physics B, 902, pp. 440-457. (doi: 10.1016/j.nuclphysb.2015.11.017)

Abstract

he 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Englert, Professor Christoph
• Authors: Englert, C., McCullough, M., and Spannowsky, M.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Nuclear Physics B
• Publisher: Elsevier B.V.
• ISSN: 0550-3213
• ISSN (Online): 1873-1562
• Copyright Holders: Copyright © 2015 The Authors
• First Published: First published in Nuclear Physics B 902:440-457
• Publisher Policy: Reproduced under a creative commons license