Jet Cross-Section Measurements In CMS

TL;DR

This paper reviews jet cross-section measurements at CMS during 7 TeV collisions, discussing experimental and theoretical issues, and compares the results with NLO predictions, finding good agreement within 8-10%.

Contribution

It provides a comprehensive review of jet measurement techniques and compares experimental results with theoretical predictions at 7 TeV in CMS.

Findings

Measurements agree with NLO predictions within 8-10%.

Jet properties are measured with high precision.

The study enhances understanding of jet physics at LHC energies.

Abstract

The Large Hadron Collider (LHC) experiment has successfully completed data taking at center of mass (COM) energy 7 TeV in 2011 and very recently for 8 TeV. Measurement of cross sections predicted by the standard model were the main tasks in the beginning. The inclusive jet cross section and dijet mass measurement is 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 article 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 leading order (NLO) theory predictions, corrected for the non-perturbative (NP) effects, for five different sets of parton distribution functions (PDF). It is observed that the measurements, for both cases, agree with the theory prediction within $\sim$8-10% depending on transverse momentum ($p_T$) and dijet invariant mass ($M_{jj}$) of jets.