Present Position

Professor Department of Physics and Astronomy
Michigan State University
East Lansing, MI 48824-1116
517-353-0833
internet: repko@pa.msu.edu

Education:
1963	B.S. Wayne State University
1967	Ph.D. Wayne State University

Professional Experience:
Professor	Michigan State University	1983 - present
Visiting Professor	University of Texas-Austin	January - June 1983
Professor	Michigan State University	1979 - 1982
Associate Professor	Michigan State University	1974 - 1979
Visiting Associate Professor	The Johns Hopkins University	January - June 1976
Assistant Professor	Michigan State University	1970 - 1974
Research Associate	The Johns Hopkins University	1968 - 1970
Research Associate	Wayne State University	1967-1968

Professional Societies:

Phi Beta Kappa, Fellow, American Physical Society


Grants:

Theoretical Studies of Electroweak and Hadronic Interactions
National Science Foundation Grant PHY-93-07980.


Refereed Publications:

1. Irreducible Representations of the Unitarity and Lorentz Groups
   (with R. L. Anderson and S. N. Gupta),
   Nuclear Physics 87, 798 (1967).

2. Electromagnetic Interaction of the Bargmann-Wigner Field with Spin 1/2
   (with S. N. Gupta),
   Phys. Rev. 159, 1082 (1967).

3. Electromagnetic Interaction of the Bargmann-Wigner Fields
   (with S. N. Gupta),
   Phys. Rev. 16, 1415 (1968).

4. Quantization of the Charged Spin 3/2 Field
   (with S. N. Gupta),
   Phys. Rev.177, 1921 (1969).

5. Quark Field Algebra, Gauge Field Algebra, and Schwinger Terms
   (with C. W. Kim and A. Sato),
   Phys. Rev.185, 1983 (1969).

6. Chiral Invariant Regularization and Renormalization of the Axial-Vector Current
   (with C. W. Kim and A. Sato),
   Phys. Rev. 187, 1966 (1969).

7. Renormalization of the Axial-Vector Vertex in Spinor Electrodynamics
   (with C. W. Kim and A. Sato),
   Phys. Rev. 1, 434 (1970).

8. Corrections to the Positronium Hyperfine Structure of Order
   (with T. Fulton and D. A. Owen),
   Phys. Rev. Lett. 24, 1035 (1970), and 25, 782 (E) (1970).

9. Order Corrections to the Muonium Hyperfine Structure
   (with T. Fulton and D. A. Owen),
   Phys. Rev. Lett. 26, 61 (1971).

10. Theory of the Positronium Hyperfine Structure
    (with T. Fulton and D. A. Owen),
    in Proceedings of the International Conference on Precision Measurement and Fundamental Constants, 7-10 August, 1970, edited by D. N. Langenberg and B. N. Taylor, p.309
    (National Bureau of Standards Pub. 343, August 1971).

11. Hyperfine Structure of Positronium
    (with T. Fulton and D. A. Owen),
    Phys. Rev. A 4, 1802 (1971).

12. Vacuum Polarization Corrections to the Hyperfine Structure of Bound System
    (with D. A. Owen),
    Phys. Rev. A 5, 1570 (1972).

13. Recoil Corrections to the Hydrogen Hyperfine Structure and the Proton Polarizability
    (with R. S. Cole),
    Phys. Rev. Lett. 29, 1295 (1972).

14. Effects of a Neutral Intermediate Boson on Leptonic Atoms,
    Phys. Rev. D 7, 279 (1973).

15. Recoil Corrections to the Hydrogen Hyperfine Interval and Bounds on the Proton Polarizability
    (with R. S. Cole),
    Phys. Rev A 8, 710 (1973).

16. Neutral Boson Effects in Muonium,
    Phys. Rev. D 9, 313 (1974).

17. Diffractive Production of the Particle and Charmed Mesons in Photon and Neutrino Interactions
    (with J. C. Pumplin),
    Phys. Rev. D 12, 1376 (1975).

18. Fine Structure Corrections and Electromagnetic Decays of Charmonium
    (with J. C. Pumplin and A. Sato),
    Phys. Rev. Lett. 35, 1538 (1975).

19. Complete Reduction of the Fermion-Antifermion Bethe-Salpeter Equation with a Static Kernel I
    (with V. K. Cung, D. Schnitzler and T. Fulton),
    Ann. Phys. (N. Y.) 96, 261 (1976).

20. Complete Reduction of the Fermion-Antifermion Bethe-Salpeter Equation with a Static Kernel II
    (with V. K. Cung A. Devoto, A. Schaum and T. Fulton),
    Ann. of Phys. (N. Y.) 90, 516 (1976).

21. Gauge Invariance of the Hyperfine Structure Arising from the Two-Fermion Bethe-Salpeter Equation
    (with V. K. Cung and T. Fulton),
    Phys. Rev. A 14, 552 (1976).

22. Discrepancy Between Direct and Indirect Determinations of the Muon-to-Proton Magnetic-Moment Ratio
    (with T. Fulton),
    Phys. Rev. D 14, 1243 (1976).

23. Threshold Production of Charmed Mesons by Virtual Photons in a Bound State Model
    Phys. Rev. Lett. 37, 1580 (1976).

24. Radiative Decays of and
    (with C. W. Kim),
    Phys. Rev. D 15, 913 (1977).

25. Ratio of Electron Capture to Positron Emission in the Elementary Particle Treatment of Nuclear Decay
    (with W. B. McFarland),
    Phys. Rev. C 15, 809 (1977).

26. Three Photon Virtual Annihilation Contributions to the Positronium Hyperfine Structure
    (with V. K. Cung, A. Devoto and T. Fulton),
    Phys. Lett. 68B, 474 (1977).

27. Order Corrections to the Positronium Hyperfine Interval Arising From Three Photon Virtual Annihilation
    (with V. K. Cung, A. Devoto and T. Fulton),
    Il Nuovo Cimento, 43A, 643 (1978).

28. Use of the Symmetric Group in the Construction of Multispinor Lagrangians
    (with M. L. Larsen),
    Jrnl. Math Phys.19, 930 (1978).

29. Contributions to the Positronium Hyperfine Structure from Two Photon Virtual Annihilation
    (with V. K. Cung, A. Devoto and T. Fulton),
    Phys. Lett. 78B , 116 (1978).

30. Application of Gegenbauer Integration Techniques to Virtual Annihilation Processes
    (with V. K. Cung, A. Devoto and T. Fulton),
    Phys. Rev. D 18 , 3893 (1978).

31. Transverse Quark Polarization in Large -- Reactions Jets and Leptoproduction: A Test of Q.C.D.
    (with G. L. Kane and J. C. Pumplin),
    Phys. Rev. Lett. 41 , 1689 (1978).

32. Order Contributions to Positronium Hyperfine Structure from Radiative Corrections to Two Photon Virtual Annihilation
    (with V. K. Cung, A. Devoto and T. Fulton),
    Phys. Rev. A 19, 1886 (1979).

33. Polarization of High-Transverse-Momentum Photons as a Test of Quantum Chromodynamics
    (with A. Devoto, J. C. Pumplin and G. L. Kane),
    Phys. Rev. Lett. 43, 1062 (1979).

34. Polarization of Gluon Jets in Photon-Photon Scattering
    (with A. Devoto, J. Pumplin and G. Kane),
    Phys. Lett. 90B, 436 (1980).

35. Bethe-Salpeter Equation with Instantaneous Harmonic Oscillator Exchange
    (with L. C. Hostler),
    Ann. Phys. (N.Y.) 130, 329 (1980).

36. Scale Transformations and the Variational Principle,
    Am. Jrnl. Phys. 49 , 84 (1981).

37. Corrections to Positronium Levels Using a Coordinate Representation of the Reduced Coulomb Green's Function,
    (with L. C. Hostler),
    Phys. Rev. A 23, 2425 (1981).

38. Radiative Decays of Heavy Vector Mesons into Paraquarkonia
    (with A. Devoto),
    Phys. Lett. 106B, 501 (1981).

39. Gluon Polarization in Quark Gluon Elastic Scattering
    (with A. Devoto),
    Phys. Rev. D 25 (Rapid Comm.), 904 (1982).

40. Quarkonium Spectra and Quantum Chromodynamics
    (with S.N.Gupta and S.F.Radford),
    Phys. Rev. D26 (Rapid Comm.), 3305 (1982).

41. Radiative Decays of Heavy Vector Mesons Into p-State Quarkonia
    (with A. Devoto),
    Phys. Rev. D 27 (Rapid Comm.), 692 (1983).

42. Beta Decay with Neutrino Mass Effects in the Elementary Particle Treatment of Weak Interactions
    (with C. E. Wu),
    Phys. Rev. C 27, 1754 (1983).

43. Electron-Positron Annihilation Cross-Section in SU(2) X U(1) Supergravity
    (with D. A. Dicus, S. Nandi and X. Tata),
    Phys. Rev. Letters 51, 1030 (1983).

44. Quantum Chromodynamic Model for Light and Heavy Quarkonia
    (with S. N. Gupta and S. F. Radford),
    Phys. Rev. D 28, 1716 (1983).

45. Radiative Corrections to the Endpoint of the Tritium Beta Decay Spectrum
    (with C. E. Wu.), Phys. Rev. C 28, 2433 (1983).

46. Electron Spectra from Wino Decay at the Colliders
    (with D. A. Dicus, S. Nandi and X. Tata),
    Phys. Rev. D 29, 67 (1984).

47. Lepton Pair Production as a Signature of Supersymmetry
    (with D. A. Dicus, S. Nandi and X. Tata),
    Phys. Rev. D 29, 1317 (1984).

48. Addendum to `Lepton-pair Production As a Signature of Supersymmetry'
    (with D. A. Dicus, S. Nandi, and X. Tata),
    Phys. Rev. D 30, 1112 (1984).

49. Spectroscopy
    (with S. N. Gupta and S. F. Radford),
    Phys. Rev. D 30, 2424 (1984).

50. The Effective Approximation for High Energy Collisions
    (with G. L. Kane and W. B. Rolnick),
    Phys. Lett. 148B, 367 (1984).

51. Semi-relativistic Model for Charmonium
    (with S. N. Gupta and S. F. Radford),
    Phys. Rev. D 31, 160 (1985).

52. New Standard Model Test for Future Colliders
    (with M. J. Duncan and G. L. Kane),
    Phys. Rev. Lett. 55, 773 (1985).

53. Spin-Dependent Forces in Heavy-Quark Systems
    (with S. N. Gupta and S. F. Radford),
    Phys. Rev. Lett. 55, 3006 (1985).

54. Semirelativistic potential model for heavy quarkonium
    (with S. N. Gupta and S. F. Radford),
    Phys. Rev. D 34, 201 (1986).

55. WW Physics at future colliders
    (with M. J. Duncan and G. L. Kane),
    Nuc. Phys. B 272, 517 (1986).

56. W-pair production via W-pair fusion
    (with A. Abbasabadi),
    Phys. Rev. D 36, 289 (1987).

57. Higgs identification in pair production
    (with A. Abbasabadi),
    Nuc. Phys. B 292, 461 (1987).

58. Gluon production of gauge bosons
    (with D. A. Dicus and C. Kao),
    Phys. Rev. D 36 (Rapid Comm.), 1570 (1987).

59. Bound state perturbation theory and annihilation effects in positronium
    (with A. Abbasabadi),
    Nuovo Cim. 97A, 567 (1987).

60. Note on the electron self energy
    (with A. Abbasabadi),
    Jour. Math. Phys. 28, 2990 (1987).

61. W pair production by pair fusion
    (with A. Abbasabadi),
    Phys. Lett. 199B, 286 (1987).

62. and pair production at supercollider energies
    (with A. Abbasabadi),
    Phys. Rev. D 37, 2668 (1988).

63. Single and double Higgs production by gauge boson fusion
    (with A. Abbasabadi, D. A. Dicus and R. Vega),
    Phys. Lett. 213B, 386 (1988).

64. Comparison of exact and effective gauge boson calculations for gauge boson fusion processes
    (with A. Abbasabadi, D. A. Dicus and R. Vega),
    Phys. Rev. D 38, 2770 (1988).

65. Nonsingular potential model for heavy quarkonia
    (with S. N. Gupta and C. J. Suchyta III),
    Phys. Rev. D 39, 974 (1989).

66. Unitarity Effects in Elastic Scattering
    (with C. J. Suchyta III),
    Phys. Rev. Lett. 62, 859 (1989).

67. One--Loop Corrections and Unitarity Effects in Gauge Boson Scattering
    (with D. A. Dicus),
    Phys. Lett. B 228, 503 (1989).

68. Muonium and positronium potentials
    (with S. N. Gupta and C. J. Suchyta III),
    Phys. Rev. D 40, 4100 (1989).

69. Gauge Invariance and Binding Energy Regularization of Bound State Infrared Divergences
    (with A. Devoto),
    Phys. Rev. A 42, 5730 (1990).

70. Padé Approximants and Unitarity in and Scattering
    (with D. A. Dicus),
    Phys. Rev. D 42, 3660 (1990).

71. W_R Identification at Hadron Colliders
    (with J.-M. Frere),
    Phys. Lett. B 254, 485 (1991).

72. Charged particle trajectories in simple non-uniform magnetic fields
    (with J. Repko and A. Saaf),
    Am. Jrnl. Phys. 59, 652 (1991).

73. Padé Unitarization and the Production of and Pairs at High Energy Colliders
    (with D. A. Dicus),
    Phys. Rev. D 44, 3473 (1991).

74. Unitarity effects in like--charge W pair production
    (with A. Abbasabadi),
    Phys. Rev. D 47, 1239 (1993).

75. I = 1, J = 1 Resonances in the Padé Unitarized Scattering Amplitude
    (with D. A. Dicus),
    Phys. Rev. D 47, 4154 (1993).

76. W, Z, and Higgs-boson scattering at SSC energies
    (with S. N. Gupta and J. M. Johnson),
    Phys. Rev. D 48, 2083 (1993).

77. Photon neutrino scattering
    (with D. A. Dicus),
    Phys. Rev. D 48, 5106 (1993).

78. Effects of a strongly interacting Higgs sector on scattering
    (with A. Abbasabadi, D. Bowser-Chao and D. A. Dicus),
    Phys. Rev. D 49 , 547 (1994).

79. Heavy quarkonium potential model and the ¹P₁ state of charmonium
    (with S. N. Gupta, J. M. Johnson and C. J. Suchyta III),
    Phys. Rev. D 49, 1551 (1994).

80. Effects of transverse polarization on the unitarization of WZ scattering amplitudes
    (with A. Abbasabadi),
    Phys. Rev. D 50, 5704 (1994).

81. Higgs-photon associated production at colliders,
    (with A. Abbasabadi, D. Bowser-Chao and D. A. Dicus),
    Phys. Rev. D. 52, 3919 (1995).

82. Production of pseudoscalar Higgs bosons in collisions,
    (with D. A. Dicus),
    Phys. Rev. D 53, 3616 (1996).

83. Gauge-boson scattering signals at the LHC,
    (with S. N. Gupta, J. M. Johnson and G. A. Ladinsky),
    Phys. Rev. D 53, 4897 (1996).

84. Relativistic two-photon and two-gluon decay rates of heavy quarkonia,
    (with S. N. Gupta and J. M. Johnson),
    Phys. Rev. D 54, 2075 (1996).

85. Radiative Higgs boson decays H --> f fbar gamma,
    (with A. Abbasabadi, D. Bowser-Chao and D. A. Dicus),
    Phys. Rev. D 55, 5647 (1997).

86. Photon-Neutrino Interactions,
    (with D. A. Dicus),
    Phys. Rev. Lett. 79, 569 (1997).

87. Higgs-photon production at mu mubar colliders,
    (with A. Abbasabadi, D. Bowser-Chao and D. A. Dicus),
    Phys. Rev. D 57, 550 (1998).

88. Effective Lagrangians and low energy photon-photon scattering,
    (with D. A. Dicus and Chung Kao),
    Phys. Rev. D 57, 2443 (1998).

89. Production of neutral scalar Higgs bosons at e gamma colliders,
    (with Y. Liao),
    Phys. Rev. D 57, 6998 (1998).

90. Higgs-photon associated production at hadron colliders,
    (with A. Abbasabadi, D. Bowser-Chao and D. A. Dicus),
    Phys. Rev. D 58, 057301 (1998).

91. gamma nu -> gamma gamma nu and crossed processes at energies below m_W,
    (with D. A. Dicus and C. Kao),
    Phys. Rev. D 59, 013005 (1999).

1. Order Corrections to the Hydrogen Hyperfine Structure
   (with R. S. Cole),
   Bull. Am. Phys. Soc. 16, 849 (1970).

2. The Bound States: A New Testing Ground for Q. E. D., the Bethe-Salpeter Equation and Universality
   (with D. A. Owen),
   Oxford Conference on Nuclear and Particle Physics, 22 - 24 September, 1971.

3. Green Functions for Particles of Arbitrary Spin
   (with M. L. Larsen),
   Bull. Am. Phys. Soc. 18, 572 (1973).

4. Exact Hamiltonian Formulation of the Two-Fermion Bethe-Salpeter Equation
   (with T. Fulton),
   XVIII International Conference of High Energy Physics (1976).

5. Exact Relativistic Hamiltonian Arising from the Two-Fermion Bethe-Salpeter Equation with a Static Kernel,
   Aspen Workshop on Quantum Electrodynamics, June 7-25, 1976.

6. Lagrangian for Spin 2 in the Bargmann--Wigner Formalism
   (with M. L. Larsen),
   Bull. Am. Phys. Soc. 22, 33 (1977).

7. One-Loop Quantum Chromodynamic Corrections to the Quark-Antiquark Potential and Quarkonium Spectroscopy
   (with S. N. Gupta and S. F. Radford),
   1983 Lepton-Photon Conference, Cornell University.

8. One-Loop Corrections to the Quark-Antiquark Potential and the Spectrum
   (with S. N. Gupta and S. F. Radford),
   1985 International Symposium on Lepton and Photon Interactions at High Energies, 19-24 August, Kyoto, JAPAN.

9. Transverse luminosity and the effective W Approximation
   (with A. Abbasabadi),
   in Proceedings of the Summer Study on the Physics of the Superconducting Supercollider, Snowmass, Colorado, 1986, edited by R. Donaldson and J. N. Marx, p. 154.

10. Comparison between an exact calculation for the charged current sector and the effective-W approximation
    (with A. Abbasabadi, J.F. Gunion, J. Kalinowski and A. Tofighi-Niaki),
    in Proceedings of the Summer Study on the Physics of the Superconducting Super Collider, Snowmass, Colorado, 1986, edited by R. Donaldson and J. N. Marx, p.156.

11. Gluonic Production of WW and ZZ at the SSC
    (with G. L. Kane and J. C. Pumplin),
    in Proceedings of the Summer Study on the Physics of the Superconducting Supercollider, Snowmass, Colorado, 1986, edited by R. Donaldson and J. N. Marx, p. 211.

12. The effective gauge boson approximation
    (with W.-K. Tung),
    Working Group Summary in Proceedings of the Summer Study on the Physics of the Superconducting Supercollider, Snowmass, Colorado, 1986, edited by R. Donaldson and J. N. Marx, p. 159.

13. Evidence for a neutrino burst from the supernova SN1987A
    (with J. A. Cowen),
    International Europhysics Conference on High Energy Physics, Uppsala, SWEDEN, June 25 - July 1, 1987.

14. Gauge boson pair production at high energy colliders
    (with A. Abbasabadi),
    1987 International symposium on Lepton and Photon Interactions at High Energy, July 27-31, 1987 Hamburg, FRG.

15. Nonsingular Potential Model for Heavy Quarkonium
    (with S. N. Gupta and C. J. Suchyta III),
    XXIV International Conference of High Energy Physics, August 4-10, 1988, Munich, FRG.

16. W, Z, and Higgs scattering at SSC energies
    (with S. N. Gupta and J. M. Johnson),
    Proceedings of the DPF Conference, Fermilab, 1992.