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We calculate decays of a Standard Model Higgs boson to a virtual massiveparticle and discuss how this depends on the massive particle total width. Ifthe partial width of Higgs to a virtual massive particle can be measured thisgives a measurement of that massive particle's width. We discuss how one wouldgo about measuring these partial widths of a Higgs experimentally, and how thiscould lead to a measurement of the $W$ boson and $t$ quark width. For thelatter extreme dependence on the Higgs mass and the small $H\to tt^*$ branchingratios mean that little can be learnt about the $t$ quark width. For the formerthere is also large dependence on the Higgs mass; however this can be removedby taking the ratio of $H\to WW^*$ decays to $H\to ZZ^*$ decays. This ratioalso has the advantage of being fairly insensitive to physics beyond theStandard Model. Unfortunately, for Higgs masses of interest the $H\to ZZ^*$branching ratio is small enough that we require many 1000's of tagged Higgsdecays before an accurate measurement of the $W$ width can be made. This islikely to be hard experimentally.

Finite width effects in Higgs boson decays as a means of measuring massive particle widths