Expertise
Particle physics theory, theoretical atomic physics
Research Interests
Particle physics theory, theoretical atomic physics
- Model Independent Calculations of the angular distributions in the decay products of resonant states produced in the collisions of protons and antiprotons, as well as protons and protons in high-energy accelerators.
- Theoretical aspects of Quantum Cascade Lasers.
- Calculation of the Landau levels and the relativistic corrections to the internal energy levels of atomic ions.
Education
- Ph.D.: Physics, (1970), University of Maryland
- MS: Physics, (1963), University of Kerala - Kerala, India
- BS: Physics, (1961), University of Kerala - Kerala, India
Selected Awards and Honors
- Sigma Pi Sigma (1966) - National Physics Honor Society
- (1966) - University of Maryland
- Gold Medal (1961) - Kerala University
- Post Graduate Merit Scholarship (1961)
Selected Publications
- Mok, A.W., Sebastian, K.J. (2010). Polarized angular distributions in the decays of the 3D2 state of charmonium produced in unpolarized proton-antiproton annihilation. European Physical Journal C, 67(1) 125-141.
- Mok, A.W., Sebastian, K.J. (2009). Angular distributions in the decays of the triplet D 2 state of charmonium directly produced in polarized proton-antiproton collisions. European Physical Journal C, 63(1) 101-114.
- Mok, A.W., Sebastian, K.J. (2008). Polarized angular distributions in the decays of the ' charmonium state directly produced in unpolarized proton-antiproton collisions. European Physical Journal C, 1-14.
- Mok, W.A., Sebastian, K.J. (1997). Angular distributions in the decays of the ' charmonium state directly produced in polarized proton-antiproton collisions. Nuovo Cimento della Societa Italiana di Fisica A, 110(4) 429-455.
- Grotch, H., Sebastian, K.J., Ridener Jr., F.L. (1997). Leptonic decay rates of charmonium S and D states. Physical Review D - Particles, Fields, Gravitation and Cosmology, 56(9) 5885-5897.
- Sebastian, K.J., Zhang, X.G. (1997). Radiative transitions of the D states of charmonium in potential models. Physical Review D - Particles, Fields, Gravitation and Cosmology, 55(1) 225-236.
- Ridener Jr., F.L., Sebastian, K.J. (1995). Angular distribution functions in the decays of ' and '' directly produced in unpolarized p p collisions. Physical Review D, 51(3) 1177-1182.
- Ridener Jr., F.L., Sebastian, K.J., Grotch, H. (1995). Angular distribution in the decay of the singlet D state of charmonium directly produced in unpolarized p p collisions. Physical Review D, 52(9) 5106-5114.
- Ridener Jr., F.L., Sebastian, K.J. (1995). Angular distribution in the decays of the triplet D2 state of charmonium directly produced in unpolarized p p collisions. Physical Review D, 52(9) 5115-5130.
- Anthony, J.M., Sebastian, K.J. (1995). Erratum: Relativistic corrections to the Zeeman effect in heliumlike atoms (Physical Review A (1995) 51, 1, (868)). Physical Review A, 51(1) 868.
- Ridener Jr., F.L., Sebastian, K.J. (1995). Signals for the formation of the singlet D and P states of charmonium in p p collisions. Physical Review D, 51(3) 1172-1176.
- Ridener Jr., F.L., Sebastian, K.J. (1994). Angular distribution functions for the decay of charmonium states directly produced by polarized proton-antiproton collisions. Physical Review D, 49(11) 5830-5839.
- Ridener, F.L., Sebastian, K.J. (1994). Angular distribution functions in the decays of , and the singlet D charmonium state directly produced in p p collisions. Physical Review D, 49(9) 4617-4622.
- Grotch, H., Sebastian, K.J., Zhang, X. (1994). Mass and the E1 decay rate of the singlet P state of charmonium. Physical Review D, 49(3) 1639-1641.
- Sebastian, K.J. (1994). Multipole amplitudes in the one-photon radiative transitions of the singlet D state of charmonium. Physical Review D, 49(7) 3450-3458.
- Anthony, J.M., Sebastian, K.J. (1994). Relativistic corrections to the Zeeman effect in hydrogenlike atoms and positronium. Physical Review A, 49(1) 192-206.
- Anthony, J.M., Sebastian, K.J. (1993). Relativistic corrections to the Zeeman effect in heliumlike atoms. Physical Review A, 48(5) 3792-3810.
- Grotch, H., Zhang, X., Sebastian, K.J. (1992). Electric dipole transition rates of the bound states of the bb system. Physical Review D, 45(11) 4337-4339.
- Sebastian, K.J., Grotch, H., Ridener Jr., F.L. (1992). Multipole amplitudes in parity-changing one-photon transitions of charmonium. Physical Review D, 45(9) 3163-3172.
- Ridener Jr., F.L., Sebastian, K.J., Grotch, H. (1992). Radiative angular distributions from charmonium states directly produced by p-p annihilation. Physical Review D, 45(9) 3173-3176.
- Zhang, X., Sebastian, K.J., Grotch, H. (1991). M1 decay rates of heavy quarkonia with a nonsingular potential. Physical Review D, 44(5) 1606-1609.
- Doncheski, M.A., Grotch, H., Sebastian, K.J. (1990). Angular distribution of photons in the parity-changing one-photon radiative decays of quarkonia. Physical Review D, 42(7) 2293-2299.
- Sebastian, K.J., Grotch, H., Zhang, X. (1988). M1 transitions involving the D states of quarkonia. Physical Review D, 37(9) 2549-2556.
- Grotch, H., Zhang, X., Sebastian, K.J. (1987). Electric dipole transitions of charmonium D states. Physical Review D, 35(9) 2900-2902.
- Sebastian, K.J. (1986). Relativistic invariance of the two-photon transition amplitude of a composite system. Physical Review A, 34(5) 3839-3846.
- Grotch, H., Owen, D.A., Sebastian, K.J. (1984). Relativistic corrections to radiative transitions and spectra of quarkonia. Physical Review D, 30(9) 1924-1936.
- Sebastian, K.J. (1984). The relativistic M1 transition in positronium. Physics Letters A, 101(5-6) 251-252.
- Grotch, H., Sebastian, K.J. (1982). Magnetic dipole transitions of narrow resonances. Physical Review D, 25(11) 2944-2950.
- Sebastian, K.J. (1982). Relativistic corrections to the electric dipole one-photon transition rates of charmonium. Physical Review D, 26(9) 2295-2311.
- Sebastian, K.J. (1981). Erratum: Interaction of a composite system with the quantized radiation field in an approximately relativistic theory (Physical Review A (1981) 24, 6, (3284-3285)). Physical Review A, 24(6) 3284-3285.
- Sebastian, K.J. (1981). Interaction of a composite system with the quantized radiation field in an approximately relativistic theory. Physical Review A, 23(6) 2810-2825.
- Sebastian, K.J. (1979). External interaction of a weakly bound composite system of charged particles with the quantized radiation field. Physical Review A, 19(4) 1398-1415.
- Sebastian, K.J., Yun, D. (1979). Lie algebra of the Poincar group and the relativistic center-of-mass variables of a composite system. Physical Review D, 19(8) 2509-2513.
- Sebastian, K.J. (1978). Relativistic invariance of the external interaction of a composite system of charged particles with the quantized radiation field. Physics Letters A, 67(2) 105-109.
- Sebastian, K.J. (1977). The low-energy theorem for the forward compton amplitude of a stationary composite system and the FW additive external electromagnetic interaction. Il Nuovo Cimento A Series 11, 42(2) 259-266.
- Sebastian, K.J. (1975). The magnetic moments of the ground-state baryons in the nonrelativistic free-quark model. Il Nuovo Cimento A Series 11, 29(1) 1-12.
- Sebastian, K.J. (1975). The nonrelativistic quark model and the nonleptonic hyperon weak decays. Il Nuovo Cimento A Series 11, 29(4) 548-556.
- Sebastian, K.J. (1973). A new estimate of the parameter c of Gell-Mann, oakes and renner in the (3,3*) (3*3) model of SU (3) SU (3) symmetry breaking. Nuclear Physics, Section B, 52(2) 639-645.
- Sebastian, K.J. (1973). Current algebra and the vector-meson-dominance model of the parity-violating nonleptonic weak decays of k mesons and of the hyperons. Physical Review D, 8(7) 2296-2299.
- Sebastian, K.J., Nelson, C.A. (1973). I. Physical Review D, 8(9) 3144-3161.
- Sebastian, K.J. (1972). The question of PCAC and of the chiral SU(2) SU(2) symmetry. Nuclear Physics, Section B, 47(1) 301-312.
- Sebastian, K.J. (1971). Once-subtracted dispersion relations, current algebra, and nonleptonic weak decays of hyperons. Physical Review D, 4(3) 771-784.
- Sebastian, K.J. (1969). Once subtracted dispersion relations, current algebra and Kl4 axial form factors. Nuclear Physics, Section B, 12(2) 471-494.
- Sebastian, K.J. (1968). High-energy forward double exchange production cross sections in the quark model. Physical Review, 167(5) 1523-1526.
- Pati, J.C., Sebastian, K.J. (1968). Once-subtracted dispersion relations, current algebra, and Kl3 Form Factors. Physical Review, 174(5) 2033-2036.
Selected Presentations
- The Relativistic Corrections to the M1 Decay-Rates of Heavy Quarkonia
- Leptonic Decays of Heavy Quarkonia, March 1998 - Lowell, MA
- Leptonic decay-rates of charmonium S and D states, May 1996 - University Park, PA
- The Multipole Amplitudes in the one-photon radiative transitions of the singlet D state of Charmonium, July 1994 - University Park, PA
- The Mass and the E1 decay-rate of the singlet P state Of Charmonium, July 1993 - University Park, PA
- The Angular Distribution of photons in the One-photon radiative transitions of Quarkonia, March 1992 - Lowell, MA
- The angular distribution of radiation from Charmonium States directly produced by annihilation of protons and antiprotons, July 1991 - University Park, PA
- M1 Decay-Rates of Heavy Quarkonia with a Nonsingular Potential - American Physical Society Meeting, April 1989
- The Relativistic Corrections to the M1 Decay-rates of Heavy Quarkonia, October 1988 - Lowell, MA
- Magnetic Dipole Transitions involving the D states of Quarkonia - American Physical Society Meeting, April 1988
- The Relativistic Corrections to the Radiative Decays of Heavy Quarkonia, May 1987 - University Park, PA
- Relativistic Invariance of the Two-Photon Amplitude of a Composite System - American Physical Society Meeting, April 1986
- The Relativistic Corrections to the Two-Photon Decay Amplitudes of Composite Systems, October 1985 - Lowell, MA
- The Relativistic Corrections to the E1 and the M1 Decay-Rates of Charmonium in Potential Models, July 1983 - University Park, PA
- Relativistic Corrections to the Electric Dipole One Photon Transition Rates of Charmonium - American Physical Society Meeting, April 1983
- The Relativistic Center of Mass Variables and an Approximately Relativistic Theory of Quarkonia, March 1983 - Tbilisi, Soviet Georgia
- The Relativistic Magnetic Dipole Transition Rates Of Charmonium, March 1982 - Lowell, MA
- The Relativistic Corrections to E1 and M1 Decay-rates Of Composite Systems of Charged Particles, August 1981 - University Park, PA
- The Lie Algebra of the Poincare Group and the Relativistic Center of Mass Variables of a composite System - American Physical Society Meeting, April 1980
- A new approach to the interaction of composite Systems with an external electromagnetic field - Department of Physics, April 1980 - Syracuse, New York
- The Relativistic Corrections to the Radiative Decays of Composite Systems - Department of Physics, May 1979 - Rochester, New York
- An Approximately Relativistic Theory of The Interaction of a Composite System with the Quantized Radiation Field - Department of Physics, December 1978 - Madras, India
- The use of relavistic center of mass variables in an Approximately relavistic theory of composite systems - Center for Theoretical Physics, September 1978 - Bangalore, India
- The external interaction of a composite system of Charged particles with the quantized radiation field - Department of Physics and Applied Physics, March 1978 - Lowell, MA
- Dispersion Relations, Current Algebra and the Nonleptonic Weak Decays - Department of Physics, July 1974 - Purdue University, West Lafayette, Indiana
- The question of partial conservation of axial vector Currents in Weak Interactions - LTI Department of Physics and Applied Physics, October 1973
- The Isospin selection rules in the nonleptonic weak decays - Center for Theoretical Physics, June 1973 - University of Maryland, College Park, Maryland
- The Nonleptonic Weak Decays in the Symmetric Quark Model - Center for Particle Theory, August 1972 - University of Texas, Austin, Texas
- Theory of Weak Interactions - LTI Department of Physics and Applied Physics, March 1970
- Once subtracted dispersion relations, current algebra and weak decays of hadrons - LTI Department of Physics and Applied Physics, August 1969