James A Mueller


413 Allen Hall
(412) 624-1566
Associate Professor


My research interests lie in the field of experimental particle physics. This includes studies of heavy quarks, where the large mass makes theoretical interpretation of the experimental data easier, understanding the parameters of the CKM matrix which describe how the quarks change from one type to another under the weak interaction, CP–violation which is one ingredient required to explain the abundance of matter over anti–matter in our universe, and how the quarks and gluons interact with one another under the strong force which binds all nuclear matter together.


My current research involves experimental studies of how the quarks and gluons combine to form the known hadrons. Specifically, I am studying excited states of the proton and their electromagnetic transitions from that ground state. This research is conducted with the


detector at the

Thomas Jefferson National Accelerator Facility


Selected Publications

  • "The ep → e΄pn reaction at and above the S11(1535) baryon resonance," R. Thompson et al. [CLAS Collaboration], Phys. Rev. Lett. 86, 1702 (2001).
  • "Electroproduction of the Λ(1520) hyperon," S. P. Barrow et al. [Clas Collaboration], Phys. Rev. C 64, 044601 (2001).
  • "Exclusive electroproduction of Φ mesons at 4.2-GeV," K. Lukashin et al. [CLAS Collaboration], Phys. Rev. C 63, 065205 (2001).
  • "Photoproduction of Φ(1020) mesons on the proton at large momentum transfer," E. Anciant et al. [CLAS Collaboration], Phys. Rev. Lett. 85, 4682 (2000).
  • "Measurement of the associated γμ± production cross section in pp collisions at root(s) = 1.8-TeV," F. Abe et al [CDF Collaboration], Phys. Rev. D 60, 092003 (1999).

Graduate Advisor

Kevin Sapp