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The model independent measurement of the absolute ZH cross section of theHiggsstrahlung process e+e- -> ZH is an unique measurement at the ILCindispensable for measuring the Higgs couplings and their deviations from theStandard Model in order to identify new physics models. The performance inmeasuring the ZH cross section using events in which the Higgs boson recoilsagainst a Z boson which decays into a pair of muons or electrons has beendemonstrated based on full simulation of the ILD detector for three center ofmass energies 250, 350, and 500 GeV, and two beam polarizations (Pe-,Pe+)=(-80%, +30%) and (+80%, -30%). This paper demonstrates in detail that theanalysis which achieved these results are model independent to the sub-percentlevel. Data selection methods are designed to optimize the precisions of the ZHcross section and at the same time minimize the bias on the measured due todiscrepancy in signal efficiencies among Higgs decay modes. Under conservativeassumptions which take into account unknown Higgs decay modes, the relativebias on the ZH cross section is shown to be smaller than 0.2% for allcenter-of-mass energies, which is five times below even the smallest ZH crosssection statistical uncertainties expected from the leptonic recoilmeasurements in a full 20 years ILC physics program.

Model independence of the measurement of the e+e- -> ZH cross section using Z->{\mu}+{\mu}- and Z->e+e- at the ILC