# Stephen Cotanch

### Bio

Professor Cotanch received his PhD in 1973 from the Florida State University. He was a visiting graduate student at Princeton University for the 1971-72 year and a postdoctoral research associate at the University of Pittsburgh from 1973 to 1976. He joined NC State University as Assistant Professor in 1976.

### Research Description

His research contributions center on many-body techniques to diagonalize effective Hamiltonians, describing the complex behavior of systems of fermions and bosons interacting via the electromagnetic, weak and strong nuclear forces (including Quantum Chromodynamics). He advanced the understanding of the structure of nuclei, hypernuclei and elementary particles, especially exotic glueballs and hybrid mesons containing color confined gluons and quarks. He developed improved scattering and reaction formulations for direct nuclear reactions, photonuclear processes and K meson scattering and production. He also collaborated with experimentalists, including proposed particle measurements and detector design, and he derived several novel constraint relations and theorems from fundamental principles and symmetries to assist experimental analysis.

### Honors and Awards

- He is a Fellow of the American Physical Society, a member of Sigma Xi, Sigma Pi Sigma and Phi Kappa Phi. In 1993 he was awarded a Nordita Nordic Professorship to perform research at the Neil Bohr Institute in Copenhagen and the Universities of Uppsala and Helsinki.

### Selected Publications

**Coulomb Gauge Model for Hidden Charm Tetraquarks**

W. Xie, L. Q. Mo, P. Wang, Stephen R. Cotanch*Phys. Lett. B*, 275, (2013), 148

**Coupled Channels Optical theorem and Non-elastic Cross Section Sum Rule**

Stephen R.Cotanch*Nucl. Phys.*, A842, (2010), 48

**Meson and Tetra-quark Mixing**

P. Wang, S. R. Cotanch and I. General*Phys. J.*, C 55, (2008), 409

**Light 1 ^{-+} Exotics: Molecular Resonances**

Ignacio J. General, Ping Wang, Stephen R. Cotanch, Felipe J. Llanes-Estrada

*Phys. Lett. B*, 653, (2007), 216

**Coulomb Gauge Approach to gqq Hybrid Mesons**

Ignacio J. General, Stephen R. Cotanch, Felipe J. Llanes-Estrada*Eur. Phys. J. C*, 51, (2007), 347

**QCD Coulomb Gauge Approach to Exotic Hadrons**

S. R. Cotanch, I. J. General, P. Wang*Eur. Phys. J. A*, 31, (2006), 656

**Oddballs and a Low Odderon Intercept**

Felipe J. Llanes-Estrada, Pedro Bicudo, Stephen R. Cotanch*Phys. Rev. Lett.*, 96, (0816012006)

**Many Body Methods and Effective Field Theory**

Thomas Schaefer, Chung-Wen Kao, Stephen R. Cotanch*Nucl. Phys.*, A762, (2005), 82

**Tensor Glueball Photoproduction and Decay**

Stephen R.Cotanch, Robert A.Williams*Phys. Lett. B*, 621, (2005), 269

**BCS and Attractive Hubbard Model Comparative Study**

Nathan Salwen, Steven A. Sheets, Stephen R. Cotanch*Phys. Rev. B*, 70, (2004), 064511

**Hyperfine Meson Splittings: Chiral Symmetry Versus Transverse Gluon Exchange**

Llanes Estrada, Felipe José and Cotanch, Stephen R and Szczepaniak, Adam P and Swanson, Eric S*Phys. Rev. C*, 70, (2004), 035202

**Goldberger-Treiman Criteria for Hyperon Coupling Constants**

Ignacio J. General, Stephen R. Cotanch*Phys. Rev. C*, 69, (2004), 035202

**Ladder Dyson-Schwinger Calculation of the Anomalous γ-3π Form Factor**

Stephen R. Cotanch, Pieter Maris*Phys. Rev. D*, 68, (2003), 036006

**QCD Based Quark Description of π−π Scattering up to the σ and ρ Region**

Stephen R. Cotanch and Pieter Maris*Phys. Rev. D*, 66, (2002), 116010

**Probing Proton Strangeness with Time-Like Virtual Compton Scattering**

Stephen R. Cotanch, Robert A. Williams*Phys. Lett. B*, 549, (2002), 85

**QCD Glueball Regge Trajectory and the Pomeron**

Felipe J. Llanes-Estrada, Stephen R. Cotanch, Pedro J. de A. Bicudo, J. Emilio F. T. Ribeiro, Adam P. Szczepaniak*Nucl. Phys.*, A710, (2002), 45

**Chirally Symmetric Quark Description of Low Energy π−π Scattering**

Pedro Bicudo, Stephen Cotanch, Felipe Llanes-Estrada, Pieter Maris, Emilio Ribeiro, and Adam Szczepaniak*Phys. Rev. D*, 65, (2002), 076008

**Relativistic Many-Body Approach to Mesons**

Felipe J, Llanes-Estrada, Stephen R. Cotanch*Nucl. Phys.*, A697, (2002), 303

**Many-Body Coulomb Gauge Exotic and Charmed Hybrids**

Felipe J. Llanes-Estrada, Stephen R. Cotanch*hys. Lett. B*, 504, (2001), 12

**Meson Structure in a Relativistic Many-Body Approach**

Felipe J. Llanes-Estrada, Stephen R. Cotanch*Phys. Rev. Lett.*, 84, (2000), 1102

**Renormalized Effective QCD Hamiltonian: Gluonic Sector**

D. G. Robertson, E. S. Swanson, A. P. Szczepaniak, C.-R. Ji, and S. R. Cotanch*Phys. Rev. D*, 59, (1999), 074019

**Large Scale Continuum Shell Model Calculations for Photonuclear Reactions with Δ Isobars and Exchange Currents**

Stephen R. CotanchThomas B. Bright*Contemporary Nuclear Shell Models*, Lecture Notes in Physics (Springer-Verlag) 482, (1997), 172

**Nucleon Strangeness Content through Vector Meson Dominance**

Stephen R. Cotanch and Robert A. Williams*Phys. Rev. Lett.*, 77, (1996), 1008

**Glueball Spectroscopy in a Relativistic Many-Body Approach to Hadron Structure**

Adam Szczepaniak, Eric S. Swanson, Chueng-Ryong Ji, Stephen R. Cotanch*Phys. Rev. Lett.*, 76, (1996), 2011

**Light Quark Energy Distribution in Heavy Quark Symmetry**

A. Szczepaniak, C-R. Ji, S.R. Cotanch*Phys. Rev. Lett.*, 72, (1994), 2538

**Simultaneous Microscopic Description of ^{16}O(γ,N) Including Δ Degrees of Freedom**

Bright TB, Cotanch SR

*Phys. Rev. Lett.*, 71, (1993), 2563