CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2012-238
Title	Photon and Z (+ jet) production in lead-lead collisions with ATLAS
Author(s)	Steinberg, P (Brookhaven)
Corporate Author(s)	The ATLAS collaboration
Publication	2012
Imprint	29 Oct 2012
Number of pages	mult.
In:	23rd International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Washington, DC, USA, 13 - 18 Aug 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	HEAVYIONS
Abstract	ATLAS results on the production of photons and $Z$ bosons are presented. Their production rates are found to scale with the number of binary collisions, as expected from QCD factorization at large transverse momentum. This makes them an ideal tool for probing the modifcation of jets which balance their transverse momentum. Despite the large differences in available statistics, both channels show a strong modification of the energy of the recoil jets, which increases with decreasing impact parameter.
Copyright/License	Preprint: (License: CC-BY-4.0)