News from CERN
Summer 2025 finds Run 3 of the LHC continuing to collect data. The peak luminosity is typically greater than 23×10^33/cm^2/s and the total integrated luminosity is over 244 fb^-1. Arizona contributions to the upgraded ATLAS detector include 2M channels of front-end electronics for the Micromegas detectors on the New Small Wheel (NSW) and FPGA firmware used by the Liquid Argon Digital Trigger. My group recently completed two analyses using the Run 2 dataset: a search for one long-lived particle decaying in the Muon Spectrometer and a search for 2HDM Higgs bosons using a four-top quark final state. We are beginning a Run 3 analysis searching for long-lived particles decaying in the Muon Spectrometer.
Recent papers and notes
- Search for one neutral long-lived particle in the ATLAS Muon Spectrometer (recently accepted for publication!)
- Search for two neutral long-lived particles in the ATLAS Muon Spectrometer
- Search for ttH/A to four-tops in the 1l/2lOS final states
- Search for ttH/A to four-tops in the multilepton final state
- Measurement of the four-top-quark production cross section
- Phase 2 Liquid Argon readout electronics
- New Small Wheel electronics
- Phase 1 Liquid Argon digital trigger readout electronics
About me
Presently my group has started analyzing Run 3 LHC data collected at root(s) = 13.6 TeV. We are searching for long-lived particles that decay in the Muon Spectrometer such as emerging jets. We are also working on ML (machine learning) applied to Calorimeter cluster energy calibration and pileup mitigation. One member of our group works on NSW TDAQ activitites at CERN. For HL-LHC upgrades, we hold firmware responsibilities for the LAr Calorimeter readout electronics (LASP and SRTM) and firmware responsibilities for adaptable accelerator cards for the EF tracking project. There are several research opportunities for Physics and ECE students, though not all of them are paid. If you are an undergraduate or graduate student with interest in doing research with ATLAS, please talk with me or email kjohns@arizona.eduSPAMNOT