Areas of Interest
Dr. Cotanch's research addresses theoretical structure studies of hadrons and nuclei, emphasizing the photon and kaon as probes of flavored quark and baryon systems. The goal is comprehensive insight by confronting fundamental field theoretical calculations incorporating important symmetries with precision data from new and existing accelerators, most notably CEBAF at Jefferson Lab where he is a consultant. His program has three interrelated projects:
1) developing improved renomalizable QCD models incorporating chiral symmetry to understand the physics of the vacuum and hadron structure, especially hidden flavor, hybrid mesons and glueballs, the latter two having explicit gluonic degrees of freedom
2) electromagnetic studies of strangeness, including strangeness in the proton, and meson, particularly kaon, production and radiative capture for proton, deuteron and nuclear targets forming L and S hyperons and hypernuclei
3) many-body techniques for both hadron and nuclear structure studies utilizing BCS, TDA, RPA and continuum shell models approaches.
Applications span the range from quark and gluon condensates and constituents masses to large-scale, supercomputer based many-body calculations for medium energy photonuclear reactions investigating exchange currents and nuclear correlations. These projects involve continuing collaborations with experimentalists at both Jefferson Lab and the Svedberg Laboratory in Uppsala, Sweden where Dr. Cotanch is also a consultant, as well as with theorists at the Instituto Superior Tecnico, Lisbon, Portugal where he is a continuing visitor.
Recent Publications
"Coulomb Gauge hybrid Meson Calculation,"
Nucl. Phys.
B90.
F. J. Llanes-Estrada and S. R. Cotanch.
(2000). p. 117.
"Flow Equations for Quark-Gluon Interactions in Light Front QCD,"
Phys. Rev.
D62.
2000.
Elena Gubankova, Chueng Ji, and Stephen R. Cotanch.
p. 125012.
"Flow Equations for Gluodynamics in the Coulomb Gauge,"
Phys. Rev.
D62.
Elena Gubankova, Chueng Ji, and Stephen R. Cotanch.
(2000). p. 074001.
"Meson Structure in a Relativistic Many-Body Approach,"
Phys. Rev. Lett.
84.
F. J. Llanes-Estrada and S. R. Cotanch.
(2000). p. 1102.
"Renormalized Effective QCD Hamiltonian: Gluonic Sector,"
Phys. Rev.
D59.
D. G. Robertson, A. Szczepaniak, E. Swanson, C.-R. Ji and S. R. Cotanch.
(1999). p. 074019.
"Probing Nucleon Strangeness using Vector Mesons,"
Nucl. Phys.
A631.
S. R. Cotanch and R. A. Williams.
(1998). p. 478.
"QCD Hamiltonian Approach for the Glueball Spectrum,"
Nucl. Phys.
A631.
S. R. Cotanch, A. Szczepaniak, E. Swanson and C.-R. Ji.
(1998). p. 640.
"Radiative Proton Capture to Discrete States in 13N at 98 and 176 MeV,"
Nucl. Phys.
A621.
T. B. Bright, B.Hoistad, R. Johansson, E. Traneus and S. R. Cotanch.
(1997). p. 754.
"Large Scale Continuum Shell Model Calculations for Photonuclear Reactions with Contemporary Nuclear Shell Models, Lecture Notes in Physics (Springer-Verlag)
482.
S. R. Cotanch and T. B. Bright.
(1997). p. 172.
"Nucleon Strangeness Content through Vector Meson Dominance,"
Phys. Rev. Lett.
77.
R. A. Williams and S. R. Cotanch.
(1996). p. 1008.
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