Research Interests:

Properties of Subatomic Particles

Much of my research career has been centered on properties of subatomic particles, their interactions and the fundamental symmetries which govern these interactions. From 1989 until its completion in 2004 I served as Co-Spokesman for the muon (g-2) experiment at Brookhaven National Laboratory (E821). We measured the anomalous magnetic moment of the muon to a relative precision of 0.54 ppm (parts per million).   The final result from BNL E821 differed from the Standard Model value by over three standard deviations.   David Hertzog from UIUC (and later UW) and I  co-founded a new experiment at Fermilab E989 with the goal to increase the precision to 0.14 ppm in order to confirm whether there is such a discrepancy. The superconducting storage ring was moved from Brookhaven to Fermilab and installed in a new building.  A powerful new muon beamline was designed and commissioned.  The first result, with a comparable precision to the BNL result, was reported in Physical Review Letters in April 2022 and agreed well with that result. That paper has over 1,000 citations thus far.  I am also a member of the Mu2e Collaboration that Professor James Miller is leading.

Selected Publications:

“Physics at a future Neutrino Factory and super-beam facility”, A. Bandyopandhyay, et al. (The ISS Physics Working Group) Editors: S.F. King, K. Long, Y. Nagashima, B.L. Roberts and O. Yasuda, Rep. Prog. Phys. 72 (2009) 106201 (185pp),

“Muon (g 2): experiment and theory”, James P. Miller, Eduardo de Rafael and B. Lee Roberts, Rept. Prog. Phys. 70, 795-881, 2007

“Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL”, G. Bennett, et al., (Muon (g 2) Collaboration), Phys. Rev. D 73, 072003 (2006)

“First Direct Observation of Time Reversal Noninvariance in the Neutral Kaon System”, A. Angelopoulos et al., (CPLEAR Collaboration), Phys. Lett. B 444 43 (1998)

“Muon (g-2): Experiment and Theory”,   James P. Miller, Eduardo de Rafael, B. Lee Roberts and Dominik Stoeckinger, Ann. Rev. Nucl. Part. Sci. 2012.62.237-64.

On Kim, et al., Reduction of coherent betatron oscillations in a muon g-2 storage ring experiment using RF fields, New. J. Phys. 22 063002 (2020).

B. Abi et al., Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm, Phys. Rev. Lett. 126 141801 (2021).

For a full list of publications, please see the attached CV.


  • Fellow, American Physical Society, 1994.
  • W.K.H. Panofsky Prize in Experimental Particle Physics, 2023.