This parameter cannot be larger than the square root of the quantity “8 pi times root 2 divided by 3 times the Fermi constant,” by the Lee–Quigg–Thacker bound. There are four of these parameters, and two corresponding vacuum expectation values, in a “two-doublet” model. This parameter is plotted against a similar one for the top quark in a graph of the stability regions of the Standard Model vacuum. “Off shell” versions of this parameter above 250 (-5[1])(*) GeV per c squared have been observed from a “golden channel” decay mode that produces two Z bosons, then four leptons. (10[1])In 2000, the LEP collider found a potential value for this constant at 115 GeV per c squared, but it was confirmed to be (10[1])125 GeV (10[2])per c squared (10[1])by the ATLAS and CMS experiments in 2012. (10[2])For 10 points, name (10[1])this constant, the mass of the particle (10[1])that imparts mass (10[1])to gauge bosons. ■END■ (10[1])