The ATLAS detector studies proton-proton collisions at a center of mass energy of 14 TeV, seven times higher than previous facilities. It has an excellent chance for discovering the source of electroweak symmetry breaking (the Higgs boson) and possibly new forms of matter such as supersymmetric states. The lighest supersymmetric state is a prime candidate for the dark matter and supersymmetry is an essential ingredient of many attractive theories.

This detector is now in operation at CERN's Large Hadron Collider (LHC). Since 2010 it has been operating at a center of mass energy of 7 TeV and will double its energy in 2013. The Chicago group built much of the readout electronics for the hadron calorimeter (TileCal) and is currently involved in preparing an upgrade to the trigger system (FTK) used to identify interesting interactions to be recorded. The group is heavily involved in analysing the data taken by the experiment.

The Chicago group consists of six faculty members together with research personnel and students. Many of the members of the group are in full time residence at CERN, with the rest in Chicago. The physics analysis of the group is supported by a powerful computing facility which includes an ATLAS Tier 3 computing system dedicated to Chicago physicists, and one of the five US ATLAS Tier 2 facilities.

atlas detector

Recent News and Highlights from the UChicago ATLAS Group!

December 18, 2015: Run 2 search paper in photon+jet mass released (
December 15, 2015: ATLAS and CMS present physics results from Run 2 at special CERN Seminar! including indications of an excess in the diphoton mass spectrum
December 15, 2015: Run 2 search paper for fully hadronic diboson resonance released (ATLAS-CONF-2015-073)
December 14, 2015: Run 2 search paper for SUSY in multi-b final states with top-tagging applied (ATLAS-CONF-2015-067)
December 8, 2015: Run 2 search paper for strong gravity in mulijet events released (
December 4, 2015: Run 2 search paper in dijet mass and angular distributions released! (First Run 2 seach paper!) (
November 22, 2015: Yangyang Cheng and Max Swiatlowski win the 2015 US LHC Users Association Lightning Round competition!
October 22, 2015: Run 1 search paper on dark matter produced in association with a Higgs boson decaying to two bottom quarks released (
October 15, 2015: Run 1 paper on pile-up mitigation techniques for jets released (
August 12, 2015: Run 2, 13 TeV jet inputs PUB note released (ATL-PHYS-PUB-2015-036)
August 11, 2015: Run 2, 13 TeV boosted Higgs identification PUB note released (ATL-PHYS-PUB-2015-035)
August 10, 2015: Run 2, 13 TeV boosted W tagging PUB note released (ATL-PHYS-PUB-2015-033)
July 22, 2015: Run 1 RPV SUSY Stop CONF note released (ATLAS-CONF-2015-026)
June 30, 2015: Run 1 RPV SUSY Multijet Paper published Phys. Rev. D 91, 112016 (2015) (
June 19, 2015: Run I search for new massive bosons builds excitement for Run II (with major contributions from Chicago Postdoc Reina Camacho)
June 17, 2015: Congratulations to Gabriel Facini who has won a 2015 ATLAS Outstanding Achievement Award (with Anthony Morley) for his work on tracking in a dense environment.
June 4, 2015: First stable beam collisions in ATLAS (Setting Off To New Energy Horizons)
May 7, 2015: US-CERN Agreement Paves Way for New Era of Scientific Discovery
April 7, 2015: Beam Splashes at the LHC (Splashes for Synchronization)
March 19, 2015: Track reconstruction in dense environment PUB note released (ATL-PHYS-PUB-2015-006)
March 13, 2015: Global Sequential Calibration CONF note released (ATLAS-CONF-2015-002)
March 5, 2015: 14 TeV sensitivity for dijet searches PUB note released (ATL-PHYS-PUB-2015-004)
February 15, 2015: Reina Camacho joins group, new lead on boosted Higgs tagging effort
February 4, 2015: Boosted object trigger for Run 3 (gFEX) Preliminary Design Review Approved