Comparison of Higgs Boson Mass and Width Determination of the LHC and a Linear Collider

Two important properties of a Higgs boson are its mass and width. They may distinguish the Standard Model Higgs boson from Higgs bosons of extended models. The methods are different for the LHC ( Large Hadron Collider) and an LC ( Linear Collider). We show results from a direct mass and width reconstruction for a large Higgs boson mass range from 120 to 340 GeV. The mass and width have been reconstructed from the H -> ZZ -> 4mu reaction in an LHC simulation. The mass result has been compared with the recoiling mass resolution in the associated Higgs production HZ where Z -> ll and in addition with the direct mass resolution of the H -> bb decay by scaling previous Linear Collider ( LC) simulation results according to the expected event rates. The relative error is between 0.05% and 0.15%. For the Higgs boson width we compare a direct determination with indirect methods and find good complementarity with a relative error of approximately 10% over the whole mass range.