Association of Jets with the Signal Vertex

A method for the association of jets with the signal vertex is presented. The technique is shown to reduce the instrumental background rate from jets and overlapping particles originating from additional minimum bias vertices. As a benchmark, the performance of the algorithm is evaluated using the qq->qqH search channel where the vertex assignment parameters are optimized for separating qqH and ttbar events. The efficiency of a central jet veto is shown to increase for the same level of background rejection. The whole study is conducted on Monte Carlo generated events that were passed through the CMS full detector-level simulation in low luminosity conditions (L = 2x10^33 cm^-2 s^-1). It is shown that the method should give similar results also for high luminosity conditions (L = 10^34 cm^-2 s^-1).