Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS

TL;DR

This paper reports on the calibration of jet energy and measurement of transverse momentum resolution in CMS using proton-proton collision data at 7 TeV, comparing three different jet reconstruction methods.

Contribution

It introduces and compares three jet reconstruction methods for improved calibration and resolution measurement in CMS.

Findings

Calibrated jet energy response in CMS detector.

Measured transverse momentum resolution for different jet algorithms.

Compared effectiveness of calorimeter, Jet-Plus-Track, and Particle Flow methods.

Abstract

Measurements of the jet energy calibration and transverse momentum resolution in CMS are presented, performed with a data sample collected in proton-proton collisions at a centre-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 36 inverse picobarns. The transverse momentum balance in dijet and gamma/Z+jets events is used to measure the jet energy response in the CMS detector, as well as the transverse momentum resolution. The results are presented for three different methods to reconstruct jets: a calorimeter-based approach, the "Jet-Plus-Track" approach, which improves the measurement of calorimeter jets by exploiting the associated tracks, and the "Particle Flow" approach, which attempts to reconstruct individually each particle in the event, prior to the jet clustering, based on information from all relevant subdetectors.