English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

The correlation of on- and off-shell Higgs boson production at the LHC in $gg\to h^* \to ZZ$ to bound the Higgs width, under specific model-dependentassumptions, has recently received a lot of attention. As off-shell crosssection measurements in this channel suffer from a small signal yield, largebackgrounds, and theoretical uncertainties, we propose an alternativecomplementary constraint which is only possible through the combination of LEPand LHC measurements. Previous precision electroweak measurements at LEP allowfor the determination of indirect constraints on Higgs couplings to vectorbosons by considering one-loop processes involving virtual Higgs exchange. Asthe Higgs is off-shell in these diagrams we venture that LEP can be interpretedas an off-shell `Higgs Factory'. By combining these LEP constraints withcurrent LHC 8 TeV Higgs measurements a stronger limit on the Higgs width can beachieved than with LHC data alone for models with rescaled Higgs couplings.Looking to the future, avoiding ambiguities arising due to new physicsmodifications of the $hGG$ coupling, a theoretically more robust constraint canbe achieved by correlating LEP measurements with WBF Higgs production followedby Higgs decays to $WW$ and $ZZ$. This method for indirectly constraining theHiggs width is very effective for specific BSM scenarios and is highlycomplementary to other proposed methods. The limits we obtain particularlyhighlight the power of a concrete LEP+LHC combination, not only limited toHiggs width measurements.

Combining LEP and LHC to bound the Higgs Width