CMS constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs

We present the constraints set by the CMS collaboration on the total width of the recently discovered Higgs boson, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1/fb at a centre-of-mass energy $\sqrt s$ = 7 TeV and 19.7/fb at $\sqrt s$ = 8 TeV. An upper limit on the Higgs boson width of 22 MeV at a 95\% confidence level was set using the ZZ to 4l and 2l2nu final states. This bound corresponds to 5.4 times the expected value in the standard model at the measured mass of $m_{\mathrm{H}}$ = 125.6 GeV.