Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors

Understand

The most recent LHC data have provided a considerable improvement in the precision with which various Higgs production and decay channels have been measured.

• Using all available public results from ATLAS, CMS and the Tevatron, we derive for each final state the combined confidence level contours for the signal strengths in the (gluon fusion + ttH associated production) versus (vector boson fusion + VH associated production) space.
• These "combined signal strength ellipses" can be used in a simple, generic way to constrain a very wide class of New Physics models in which the couplings of the Higgs boson deviate from the Standard Model prediction.
• Here, we use them to constrain the reduced couplings of the Higgs boson to up-quarks, down-quarks/leptons and vector boson pairs.