Ben Carlson

  • Adjunct Assistant Professor
bcarlson@pitt.edu

Research

Ben's current physics interest is searching for beyond the standard model decays of the Higgs boson. He is currently working on a search for invisible decays of the Higgs boson produced via vector boson fusion, the most sensitive channel. Ben also works on the ATLAS trigger system, particularly the missing transverse energy signature, a task vital to the invisible Higgs search. He is working on techniques to mitigate the impact of pileup on the trigger rates at both L1 and the HLT, and is currently the co-convener of the missing transverse energy trigger group.

Ben has a keen interest in the long-term future of the LHC projects. In particular, he is working on the ATLAS detector design for the planned detector upgrades. In 2016, Ben coordinated all of the Monte Carlo simulation for ATLAS upgrade studies. Currently he is co-coordinator of the L1 algorithm and trigger performance forum. This group is responsible for optimizing the performance of the L1 calorimeter trigger system for the ATLAS upgrade scheduled to be installed before the next run of the LHC.

Biography

Ben Carlson is currently a Postdoctoral Associate at the University of Pittsburgh. He works on the ATLAS experiment and is based at CERN. As an undergraduate REU student, Ben studied electron cloud development at the Cornell Electron Storage Ring. He then went to graduate school at Carnegie Mellon University and received a Ph.D. in 2015. He joined the CMS experiment, where he worked on a measurement of the Upsilon cross section and a search for supersymmetry. His thesis was on a search for “stealth” supersymmetry using leptons and jets and no missing transverse energy. From 2014-2015, Ben was based at Fermilab, supported by awards from the Universities Research Association and the LHC Center for Physics.

Selected Publications

  • Benjamin Carlson, Tao Han, Sze Ching Iris Leung, Higgs to charm quarks in vector boson fusion plus a photon. arXiv: 2105.08738.
  • ATLAS Collaboration, Performance of the ATLAS Level-1 topological trigger in Run 2, submitted to EPJC. arXiv: 2105.01416.
  • Tae Min Hong, Benjamin Carlson, Brandon Eubanks, Stephen Racz, Stephen Roche, Joerg Stelzer, Daniel Stumpp, Nanosecond machine learning event classification with boosted decision trees in FPGA for high energy physics, submitted to JINST. arXiv: 2104.03408.
  • ATLAS Collaboration, Searches for electroweak production of two jets in association with a Higgs boson decaying fully or partially to invisible particles, including a final state photon using proton-proton collisions at 13 TeV with the ATLAS detector, ATLAS-CONF-2021-004
  • ATLAS Collaboration, Performance of the missing transverse momentum triggers for the ATLAS detector during Run-2 data taking, JHEP 2020 (080) (2020). arXiv: 2005.09554
  • ATLAS Collaboration, Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger, JINST 15 (2020) P11016. arXiv: 2005.04179
  • ATLAS Collaboration, Search for invisible Higgs boson decays with vector boson fusion signatures with the ATLAS detector using an integrated luminosity of 139 fb−1 , conference proceeding, ATLAS-CONF-2020-008.
  • ATLAS Collaboration, Searches for electroweak production of supersymmetric particles with compressed mass spectra in sqrt(s) = 13 TeV pp collisions with the ATLAS detector, Phys. Rev. D 101, 052005 (2020). arXiv: 1911.12606
  • ATLAS Collaboration, Combination of searches for invisible Higgs boson decays with the ATLAS experiment, Phys. Rev. Lett. 122, 231801 (2019). arXiv: 1904.05105
  • ATLAS Collaboration, Search for invisible Higgs boson decays in vector boson fusion at sqrt(s) = 13 TeV with the ATLAS detector, Phys. Lett. B 793 499-519 (2019). arXiv: 1809.06682
  • CMS Collaboration, Search for R-parity violating decays of a top squark in proton–proton collisions at sqrt(s) = 8 TeV, Phys. Lett. B. 760, 178 (2016). arXiv: 1602.04334
  • CMS Collaboration, Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV, Phys. Lett. B 749, 14 (2015). arXiv:1501.07750
  • CMS Collaboration, Search for supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV, Phys. Lett. B, 743, 503 (2015). arXiv:1411.7255
  • J.P Sikora, B.T. Carlson, D.O. Duggins, K.C Hammond, S.D Santis, A.J. Tencate, Electron cloud density measurements in accelerator beam-pipe using resonant microwave excitation, Nucl. Instrum. Methods Phys. Res., Sect. A , 754, 28-25 (2014). arXiv:1311.5633
  • S. De Santis, J.M. Byrd, M.G. Billing, M.A. Palmer, J.P. Sikora, B.T. Carlson, Characterization of electron clouds in the Cornell Electron Storage Ring Test Accelerator using TE-wave transmission,  Phys. Rev. ST Accel. Beams, 13, 071002 (2010).

Public ATLAS documents

  • ATLAS Collaboration, “Trigger Menu in 2018,” ATL-DAQ-PUB-2019-01 (2019) (link).

Recent conference and seminar presentations

  • Conference presentation, Dark Matter searches with the ATLAS detector, International Conference on New Frontiers in Physics (virtual), September 7, 2020 (link)
  • Conference presentation, Triggering on hadronic signatures with the ATLAS detector, ICHEP (virtual), July 29, 2020 (link)
  • Conference presentation, Searching for Dark Matter with the ATLAS detector, ICHEP (virtual), July 28, 2020 (link)
  • Conference presentation, ATLAS Virtual Visits – Take part from anywhere in the world, ICHEP (virtual), July 28, 2020 (link)
  • Seminar presentation, The ATLAS missing transverse momentum trigger and searches for invisible decays of the Higgs boson, Argonne National Lab (virtual), June 23, 2020
  • Conference presentation, Performance of the ATLAS missing transverse momentum trigger during Run 2 pp collisions at sqrt(s) = 13 TeV, APS April Meeting, April 20, 2020
  • Conference presentation, Searching for Dark Matter with the ATLAS Detector, Lake Louise Winter Institute, Lake Louise, Canada, February 12, 2019
  • Seminar, Searches for invisible decays of the Higgs boson with the ATLAS detector, Joint Experimental-Theoretical Physics Seminar (Fermilab), January 25, 2019
  • Seminar, Invisible Higgs with ATLAS, TRIUMF (Vancouver, Canada), December 14, 2018
  • Seminar, Invisible Higgs with ATLAS, University of Illinois at Chicago, December 12, 2018
  • Seminar, Invisible Higgs with ATLAS, LHC Physics Center Topic of the Week (Fermilab, Chicago), December 11, 2018
  • Seminar, Invisible Higgs with ATLAS, University of Chicago, December 10, 2018
  • Seminar, Invisible Higgs with ATLAS, Cambridge University (U.K.), November 6, 2018
  • Seminar, VBF Higgs to Invisible with ATLAS, Collider Cross Talk (chalk board talk, compared with CMS speaker Siddharth Narayanan), CERN, October 18, 2018
  • Conference presentation, The Higgs and dark matter with ATLAS, Higgs Coupling 2017, Heidelberg Germany, November 7, 2017 (link)
  • Conference presentation, Highlights from SUSY and Exotics with ATLAS and CMS, Brookhaven Forum, Upton NY, October 12, 2017 (link)
  • Conference presentation, ATLAS level-1 calorimeter trigger: Run-2 performance and Phase-1 upgrades, APS April meeting, Washington D.C., January 30, 2017 (link)

Public performance plots

  • Performance of ATLAS Run 3 HLT MET trigger with tracking for Run 3, April 2021 (link)
  • Performance of the ATLAS VBF trigger, November 16, 2018 (link)
  • Performance studies of the ATLAS L1 trigger upgrade for Run 3, July 2, 2018 (link)
  • Performance of ATLAS MET trigger at L1 and HLT, September 2017 (link)

Faculty Advisor

Tae Min Hong