Shape, transverse size, and charged-hadron multiplicity of jets in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper presents detailed measurements of jet properties, including shape and charged-hadron multiplicity, in proton-proton collisions at 7 TeV, providing data to test quantum chromodynamics models.

Contribution

It offers the first comprehensive set of jet shape and multiplicity measurements at 7 TeV, comparing results with multiple QCD Monte Carlo predictions.

Findings

Measured charged-hadron multiplicity increases with jet transverse momentum.

Jet shape distributions are well described by certain QCD Monte Carlo models.

Data corrected to particle level enable precise theory comparisons.

Abstract

Measurements of jet characteristics from inclusive jet production in proton-proton collisions at a centre-of-mass energy of 7 TeV are presented. The data sample was collected with the CMS detector at the LHC during 2010 and corresponds to an integrated luminosity of 36 inverse picobarns. The mean charged hadron multiplicity, the differential and integral jet shape distributions, and two independent moments of the shape distributions are measured as functions of the jet transverse momentum for jets reconstructed with the anti-kT algorithm. The measured observables are corrected to the particle level and compared with predictions from various QCD Monte Carlo generators.