JET CROSS-SECTION MEASUREMENTS IN CMS

Abstract

The Large Hadron Collider experiment has successfully completed data taking at center-of-mass energy 7 TeV in 2011 and very recently for 8 TeV. Measurements of cross-sections predicted by the standard model were the main tasks in the beginning. The inclusive jet cross-section and dijet mass measurement are already done at 7 TeV energy by Compact Muon Solenoid (CMS) detector with integrated luminosity 5 fb-1. In these measurement, one needs to understand and measure precisely the kinematic properties of jets which involve many theoretical and experimental issues. The goal of this paper is to discuss all these issues including jet measurements in CMS and subsequently review the inclusive jet cross-section and dijet mass measurement in CMS at 7 TeV with integrated luminosity 5 fb-1. The measurements, after unfolding the data, are also compared with the next-to-leading-order theory predictions, corrected for the nonperturbative effects, for five different sets of parton distribution functions. It is observed that the measurements, for both cases, agree with the theory prediction within ~8–10% depending on transverse momentum (pT) and dijet invariant mass (Mjj) of jets.