Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-10-07
Eur.Phys.J.C62:191-196,2009
Physics
Nuclear Physics
Nuclear Experiment
6 pages, 7 figues, Talk given at Hot Quarks 2008, Estes Park, CO, Aug 18-23, 2008
Scientific paper
10.1140/epjc/s10052-009-0952-z
Full jet reconstruction in relativistic heavy ion collisions provides new and unique insights to the physics of parton energy loss. Because of the large underlying event multiplicity in $A+A$ collisions, random and correlated fluctuations in the background can result in the reconstruction of fake jets. These fake jets must be identified and rejected to obtain the purest jet sample possible. A large but reducible fake rate of jets reconstructed using an iterative cone algorithm on HIJING events is observed. The absolute rate of fake jets exceeds the binary-scaled p+p jet rate below 50 GeV and is not negligible until 100 GeV. The variable $\Sigma j_{T}$, the sum of the jet constituent's $E_{T}$ perpendicular to the jet axis, is introduced to identify and reject fake jets at by a factor of 100 making it negligible. This variable is shown to not strongly depend on jet energy profiles modified by energy loss. By studying azimuthal correlations of reconstructed di-jets, the fake jet rate can be evaluated in data.
Cole Brian A.
Grau N.
Holzmann Wolf G.
Spousta Martin
Steinberg Peter
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