Fig. 3: Distributions of ZZ invariant mass observables in the off-shell signal regions.
From: Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production
Distributions of transverse ZZ invariant mass, \({m}_{{{{{{\rm{T}}}}}}}^{{{{{{\rm{Z}}}}}}{{{{{\rm{Z}}}}}}}\), from the 2ℓ2ν off-shell signal region (left) and those of the 4ℓ invariant mass, m4ℓ, from the 4ℓ off-shell signal region (right). The stacked histogram displays the distribution after a fit to the data with SM couplings, with the blue shaded area corresponding to the SM processes that do not include H-boson interactions, and the pink shaded area adding processes that include H-boson and interference contributions. The gold dot-dashed line shows the fit to the no off-shell hypothesis. The black points with error bars representing uncertainties at 68% CL show the observed data, which are consistent with the prediction with SM couplings within 1 s.d. The last bins contain the overflow. The requirements on the missing transverse momentum \({p}_{{{{{{\rm{T}}}}}}}^{{{{{{\rm{miss}}}}}}}\) in 2ℓ2ν events, and the \({{{{{{\mathcal{D}}}}}}}_{{{{{{\rm{bkg}}}}}}}\)-type kinematic background discriminants (table II of ref. 15) in 4ℓ events are applied to enhance the H-boson signal contribution. The displayed values of integrated luminosity correspond to those included in the off-shell analyses of each final state. The bottom panels show the ratio of the data or dashed histograms to the SM prediction (stacked histogram). The black horizontal line in these panels marks unit ratio.
