Uncertainties in the size of signal and background

 Both the signal and the background has theoretical uncertainties. Some of the uncertainties can be reduced through calibration with LHC data, others require theoretical developments to reduce.

The power of the different identification criteria in the simulated events have uncertainties mainly related to the effects of pile-up. In none of the simulations presented here pile-up has been added but several other independent studies have been made of the effects.

The following sections will estimate the size of the different uncertainties and with this taken into account a final estimate on the significance and the signal to background ratio of a Higgs signal will be given in section 8.9.