Roger Rusack

Roger Rusack

Roger Rusack

Professor, School of Physics and Astronomy

Contact

Physics And Nanotechnology Building
Room 430
115 Union St. Se
Minneapolis, MN 55455

Education

Ph.D., London university, 1979

B.Sc., Liverpool University, 1974

Scientific & Professional Societies

  • Fellow, American Physical Society
Research Interests

My research is conducted at the Large Hadron Collider (LHC) at CERN in Switzerland. I work with data collected at the Compact Muon Solenoid (CMS) experiment, which is one of the two large general-purpose detectors at the LHC, the other being ATLAS. The CMS Collaboration has now collected 130 inverse fentobarns of data at a center-of-mass energy of 13 TeV. After the initial observation of the Higgs boson in 2012 my group has concentrated on measuring precisely its properties and looking for anomalies. Our most recent result for the Higgs boson mass, primarily derived by the Minnesota team, is 125.38 GeV ± 0.14 GeV. This is currently (May 2021) the world's most precise value. In addition to our work on the Higgs boson our group is conducting a search for anomalous couplings between three gauge particles, which, if we were to find them, would be a sign of new physical phenomena. Later in this decade the LHC will be upgraded to the the HL-LHC where the instantaneous luminosity will be increased by a factor of five from its current value. This requires many improvements (or upgrades) to the detector. My group is working on the upgrade of the crystal calorimeter readout to improve it's timing resolution and on the complete replacement of the forward calorimeter systems with an imaging high granularity calorimeter - HGCAL. HGCAL has a littler over six million channels of silicon sensors, which allows for a full three-dimensional image of electromagnetic and hadronic showers to be observed and measured. I also have an interest in the problem of particle detection and the application of new emergent technologies to experimental high energy physics. One of my research interests in this area is the production of an radiation tolerant digitally controlled delay which allows the control of a signal delay with a precision of 200 fentoseconds. Another is the use of modern artificial intelligence tools for event reconstruction.

Research Group
CMS Collaboration at the European Center for Particle Physics (CERN)
FAIR4HEP Collaboration

Honors and Awards

Fellow, American Physical Society

Selected Publications

CMS Collaboration, "A measurement of the Higgs boson mass in the diphoton decay channel," Phys. Lett. B, 805 (2020) 135425.

R. Rusack, J. Brashear, E. Frahm, S. Jain, and R. Saradhy, “A Precision Pure Clock Distribution System” PoS, vol. TWEPP2019, p. 056, (2020)
 
CMS Collaboration, “Combined measurements of Higgs boson couplings inprotonâproton collisions at √s= 13TeV,”  Eur. Phys. J., vol. C79, no. 5, p. 421, (2019)
 
J. Brient, R. Rusack and F. Sefkow, "Silicon Calorimeters", Ann. Rev. Nucl. and Part Sci., 271-290, (2018)

CMS Collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC.Phys. Lett. B, 716 (2012) 30.

P. Adamson et al., “First measurement of electron neutrino appearance in NOvA”  Phys.Rev. Lett., vol. 116, no. 15, p. 151806, (2016).

P. Adamson et al., “First measurement of muon-neutrino disappearance in NOvA” Phys. Rev. D, vol. 93, p. 051104, (2016).

M. Andreotti et al., Precision measurements of the total and partial widths of the ψ(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations.Phys. Lett. (2007).

K. Kodama et al., Identification of neutrino interactions using the DONUT spectrometer.Nucl Instr and Meth A516 21 (2004).

K. Kodama et al., Observation of Tau-Neutrimo Interactions.Phys. Lett. B 504 (2001) 218.

Observation of a New Boson at a Mass of 125 GeV with the CMS Experiment at the LHC, Phys.Lett.B 716 (2012) 30-61, 1207.7235 [hep-ex]

A measurement of the Higgs boson mass in the diphoton decay channel, Phys.Lett.B 805 (2020) 135425, 2002.06398 [hep-ex]

CMS Collaboration et al., Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC.Physics Letters B 716 (2012) 30-61.

M. Andreotti et al., Precision measurements of the total and partial widths of the ψ(2S) charmonium meson with a new complementary-scan technique in anti-p p annihilations.Phys. Lett. (2007)

K. Kodama et al., Identification of neutrino interactions using the DONUT spectrometer.Nucl Instr and Meth A516:21-33 (2004).

K. Kodama et al., Observation of Tau-Neutrimo Interactions.Phys. Lett. B 504 (2001) 218.

K. Dieters et al., Properties of the Avalanche Photodiodes for the CMS Electromagnetic Calorimeter.Nucl. Instr.. Meth. A453:223-226 (2000).Properties of the Avalanche Photodiodes for the CMS Electromagnetic Calorimeter.

Advisees & Collaborators

Graduate Students

  • Rohith Saradhy
  • Neil Schroeder
  • Mohammad Wadud

Postdoctoral Researchers

  • Rajdeep Chatterjee
  • Andrew Evans
  • Shilpi Jain