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Measurement of the integrated luminosity at the International Linear Collider(ILC) will be accomplished by counting the rate of small angle Bhabhascattering events. The physics requirements for ILC set the constraint on therelative precision of the luminosity measurement to be of a permille order. Therequired precision can be achieved by construction of a fine granulatedelectromagnetic calorimeter of high energy and polar angle resolution and bysufficient experimental control of numerous systematic effects. One of theleading systematic effects in luminosity measurement is the backgroundoriginating from four-fermion processes, referred to as the physics background.In this paper a possible selection strategy to measure the luminosity isproposed from the perspective of optimal signal to background separation.

Physics background at ILC at 500GeV and 1TeV