Jet fragmentation and jet properties in $sqrt{s_{NN}} = 2.76$~TeV Pb+Pb collisions using the ATLAS Detector at LHC

The recent measurements of jet suppression at LHC indicate a presence of "jet quenching", strong energy loss of energetic jets in hot and dense QCD medium which has been already observed at RHIC experiments. We will discuss the results of measurement of longitudinal structure of jets. The measurement has been performed using 140 $mu b^{-1}$ of lead-lead collision data provided at a nucleon center-of-mass energy of $sqrt{s_{NN}} = 2.76$ TeV by the Large Hadron Collider and collected by the ATLAS Detector during November and December 2011.