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Physics Motivation: The Higgs mass uncertainty would could become one of the important sources of systematics (as parametric error) for the Higgs coupling determination, in particularly in particular for the HZZ and HWW couplings. Typically with 50MeV uncertainty, sys. error to on HZZ coupling would be ~0.3%. Ideally we should achieve <20 MeV uncertainty in order to keep 0.1% sys. error. At Ecm=250 GeV, it might not be a problem by leptonic recoil mass measurement, though one should look into the new beam parameters at 250 GeV which induce larger beamstrahlung effect. At Ecm>=350 GeV, leptonic recoil method becomes limited, therefore we need new method such as direct mass reconstruction from H→bb. 

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Detector Benchmark: In the Z→ll channel, there is no ambiguity in jet clustering, Higgs mass measurement is largely affected by b-jet energy resolution; however in an alternative method, measurement can be affected only by jet direction resolution , and lepton momentum resolution. In the Z→qq channel, there is some contamination from jet clustering, which might not be not a serious problem at 500 GeV; so the measurement is largely affected by JER and modeling of b-jet energy distribution.

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