ATLAS Research Project
CERN - Geneva, Switzerland
The Illinois group on the ATLAS experiment is studying the structure of quark gluon plasma (QGP) produced in the collisions of large nuclei using jets. These measurements provide unique information about the short range interactions between quarks and gluons from which the low viscosity liquid behavior of the QGP must arise. The high collision energies at the LHC provide access to the largest kinematic range and highest rates of jets produced in heavy ion collisions.
For more about the ATLAS Heavy Ion program and it’s motivations see the recent ATLAS feature article (https://atlas.cern/Updates/Feature/Heavy-Ion-Physics) co-authored by Prof. Sickles and the youtube live talk (https://www.youtube.com/watch?v=5lAtJ6Lfbmo). For more about using jets to study the QGP see the recent review article co-authored by Prof. Sickles (https://inspirehep.net/literature/1953399).
We are also interested in measurements of proton-nucleus and proton-proton collisions both as reference systems for nucleus-nucleus collisions and as a place to look for the color glass condensate.
Our group takes an active role in ATLAS data-taking with group members typically traveling to CERN for periods during the heavy-ion running. We have been involved in the trigger operation and validating the data quality. In January 2020, we hosted a ATLAS Heavy Ion Jet Workfest in Urbana.
Our group is also playing a leading role in the operations of the current ATLAS Zero Degree Calorimeter (ZDC), in the design and construction of a new Reaction Plane Detector (RPD) for ATLAS heavy ion program in Run 3, and in the joint ATLAS-CMS ZDC Upgrade project, that will design and construct the next generation of radiation-hard ZDCs & RPDs for the High-Luminosity LHC era.
Former members of our group have gone onto faculty and staff positions, postdocs at universities and labs and industry jobs.
Papers written primarily by members of our group include:
suppression of b-jets in PbPb collisions (https://inspirehep.net/literature/2074092 & ATLAS Physics Briefing https://atlas.cern/updates/briefing/heavy-ion-energy-loss)
suppression of dijets in PbPb collisions (https://inspirehep.net/literature/2075431 & ATLAS Physics Briefing https://atlas.cern/updates/briefing/dijet-suppression )
azimuthal anisotropy of jets in PbPb collisions (https://inspirehep.net/literature/1967021)
angular & momentum distribution of charged particles associated with jets in PbPb collisions (https://inspirehep.net/literature/1749578)
angular correlation of jets in pPb collisions (https://inspirehep.net/literature/1696870)
fragmentation functions of jets in PbPb and pp collisions (http://inspirehep.net/record/1673177)
fragmentation functions of jets in pPb and pp collisions (http://inspirehep.net/record/1604026)
Grad students on this project
Support of Heavy Ion
Runs at CERN
Our group actively support all the Heavy Ion related data taking (A+A, p+A and low-u p+p) with on-site presence of graduate students and post-docs.
Test beams at CERN and FermiLab
We run test beam campaign at CERN and FNAL to calibrate existing ZDC and RPD detectors and to test new radiation-hard prototypes to be used for ATLAS and CMS in the HL-LHC era
Students and Post-Docs travel to discuss their work at international conferences and meetings