Ben Carlson


Offsite (CERN)
Postdoctoral Associate


Ben's current physics interest is non-standard decays of the Higgs boson. He is currently working on a search for invisible decays of the Higgs boson produced via vector boson fusion. Ben is part of the team that runs the hardware L1 trigger system, working particularly on issues that directly impact the physics sensitivity of the trigger. He has also developed new monitoring capabilities for performance evaluation. He has also expanded his work to the computational high level trigger portion of the MET trigger. Currently he is working on techniques to mitigate the impact of pileup on the trigger rates. As a spin off of this project, he has been originating a new suite of software tools for fast and flexible estimation of the trigger rates.

Ben enjoys working with students, and supervises four undergraduates from the University of Pittsburgh. He is regularly approached by beginning graduate students from collaborating institutions seeking high-impact tasks within the trigger group, and has served as an unofficial advisor for many of them.

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. Ben coordinates all of the Monte Carlo production for upgrade studies. He also is the coordinator of a group dedicated to studying the expected performance of upgrades to the L1 calorimeter trigger system.


Ben Carlson is currently a Postdoctoral Associate at the University of Pittsburgh. He works on the ATLAS experiment and is based at CERN. Ben got his start in research studying electron cloud development at the Cornell Electron Storage Ring as an undergraduate REU summer student. 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 (MET). From 2014-2015, Ben was based at Fermilab, supported by awards from the Fermilab Universities Research Association the LHC Center for Physics.

Selected Publications

  • S. Chatrchyan et al. (CMS Collaboration), Search for R-parity violating decays of a top squark in proton–proton collisions at sqrt(s) = 8 TeV, EXO-14-013, Phys. Lett. B. 760, 178 (2016). arXiv 1602.04334
  • S. Chatrchyan et al. (CMS Collaboration), Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV, BPH-12-006, Phys. Lett. B (2015). arXiv:1501.07750
  • S. Chatrchyan et al. (CMS Collaboration), Search for supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV, SUS-14-009, 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).

Faculty Advisor

Tae Min Hong