Setting the jet energy scale in the CMS calorimeter using events with direct photons

The procedure of setting the jet energy using events with direct photons proposed as one of the methods of jet calibration in the CMS is studied. Based on complete simulation of events in the CMS including the effects of pile-up of additional events for the initial beam luminosity of the accelerator (L = 2 × 1033 cm−2s−1), the rules for event selection during calibration are proposed. Errors of the proposed method due to the background and the radiation in the ISRare estimated.