Pile-up Background Estimation in Diboson Production by the Overlay Monte-Carlo Method in pp Collider Experiment

In case of diboson production in ppcollisions there is a non-negligible probability that some events passing the final selection in data are actually from different overlapping hard-scatter processes occurring within the same bunch-crossing. Such events, that consist of combination of two processes associated withdifferent primary vertices, correspond to so-called pile-upbackground. Its contribution should be considered in analysis of diboson production at collider experiments. This article discusses an overlay Monte-Carlo approach to obtain a theoretical prediction of the pile-upevent count. According to the resulting estimate of the proposed method the impact of the pile-upbackground can be either subtracted from the data in the region of interest or accounted as an additional systematic uncertainty for the final result.

hadron collider, hadron jets, high load, background suppression