Results on Jet Spectra and Structure from ALICE

TL;DR

This paper presents preliminary results on jet spectra and structure from ALICE, including measurements of charged jets, nuclear modification factors, and correlations in Pb-Pb and pp collisions at 2.76 TeV, advancing understanding of jet quenching.

Contribution

It provides new measurements of jet spectra, nuclear modification factors, and jet structure in heavy-ion collisions at LHC energies.

Findings

Charged jet spectra measured in Pb-Pb and pp collisions.

Observation of jet quenching effects via R_AA and R_CP.

Analysis of jet resolution parameter dependence and hadron-jet correlations.

Abstract

Full jet reconstruction in ALICE uses the combined information from charged and neutral particles. Essentially all jet constituents can be measured with large efficiency down to very low transverse momenta (pT > 150 MeV/c). This has the advantage to introduce a minimum bias on the jet fragmentation, in particular for low jet momenta and in the presence of quenching. In this article, we present preliminary results from reconstruction of charged jets in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. The inclusive charged jet spectrum, the jet nuclear modification factors (R_AA, R_CP), the ratio of spectra measured with different resolution parameters and hadron-jet correlations are discussed. For pp data at the same center of mass energy, the inclusive spectrum of fully reconstructed jets and its resolution parameter dependence are reported.