Model-independent Higgs coupling measurements at the LHC using theH→ZZ→4ℓlineshape

Abstract

We show that combining a direct measurement of the Higgs total width from the $H\ensuremath{\rightarrow}ZZ\ensuremath{\rightarrow}4\ensuremath{\ell}$ lineshape with Higgs signal rate measurements allows Higgs couplings to be extracted in a model-independent way from CERN LHC data. Using existing experimental studies with $30\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ at one detector of the 14 TeV LHC, we show that the couplings squared of a 190 GeV Higgs to $WW$, $ZZ$, and $gg$ can be extracted with statistical precisions of about 10%, and a 95% confidence level upper limit on an unobserved component of the Higgs decay width of about 22% of the standard model Higgs width can be set. The method can also be applied for heavier Higgs masses.