The ATLAS detector studies proton-proton collisions at a center of mass energy of 14 TeV, seven times higher than previous facilities. WE have discovered the Higgs boson in 2012 and are constantly searching for 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 (2010-2011), 8 TeV (2012) and 13 TeV (2015-present). The Chicago group built much of the readout electronics for the hadron calorimeter (TileCal). The group is also currently involved in preparing upgrades to the trigger system used to identify interesting interactions to be recorded, including a new hardware-based track trigger (FTK), and a new hardware-based calorimeter trigger (gFEX). The group is heavily involved in analysing the data taken by the experiment.

The Chicago group consists of five 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 12, 2017: Search for production of Higgsinos in multi-b final states released! (ATLAS-CONF-2017-081)
December 11-15, 2017: Key contributions to the 2017 Hadronic Final State Forum from Giordon Stark (Advisor: David Miller), which was hosted at Southern Methodist University this year
December 6, 2017: gFEX passes the Production Readiness Review (PRR) and has been given the green light to begin production!
December 4-8, 2017: Chicago group members contribute to the 2017 ATLAS physics workshop: Physics with 120 fb-1
November 22, 2017: First measurement of the soft drop jet mass released! (
November 20, 2017: During commissioning of the FTK hardware track finder, the Chicago built AUX board processed more than 1 billion events in a 6 hour run!
November 6, 2017: Search for SUSY in multi-b final states released! (
November 3, 2017: Graduate student Kevin Hildebrand (Advisor: Mark Oreglia) wins Lightning Round competition at the Annual US LHC Users Association meeting at Fermilab!
October 30, 2017: ATLAS Group organizes and hosts the EFI Workshop on Data Analytics for Physics
May 30, 2017: Graduate student Giordon Stark (Advisor: David Miller) awarded the 2017 Nathan Sugarman Award for Excellence in Graduate Student Research!
May 2, 2017: Graduate student Patrick Bryant (Advisor: Mel Shochet) has been selected as the 2017-8 Grainger Graduate Fellow!
January 31, 2017: Graduate student Miles Wu (Advisor: David Miller) successfully defends his thesis (Measurement of collinear W boson emission: (
January 21, 2017: Graduate student Karol Krizka (Advisor: Young-Kee Kim) awarded the illustrious Chamberlain Fellowship at Lawrence Berkeley National Laboratory!
October 1, 2016: Postdoctoral scholar Max Swiatlowski appointed as convener of the subgroup on SUSY searches in squark and gluino final states and signatures in ATLAS!
September 22, 2016: Measurement paper for collinear W emission (i.e "W-strahlung") released (