Wolfgang Korsch

Fundamental Interactions at Short Distances
Office: 277 Chem-Phys. Bldg.
Phone: 859-257-4083
e-mail: korsch@pa.uky.edu

Research interests

My research interests are focussed on understanding the structure of nucleons. Nowadays, we believe that nucleons are made of three fundamental Dirac particles, so called quarks. These quarks carry 1/3 or 2/3 of the elementary charge of an electron or positron and have a spin 1/2. The current distribution of these quarks inside a nucleon is very complex and complicated. By means of electron scattering experiments over a large range of energies (from a few hundred MeV to about 30 GeV) one can study the electric and magnetic current distributions. Using polarized electrons (the spins of the electrons are alligned parallel or antiparallel to their momentum) and polarized targets, such as protons, deuterons, or ³He, one has a tool to investigate new fundamental properties of the nucleons, such as questions like: Where does the nucleon gets its spin?
I am collaborating in the Polarized ³He Collaboration in Hall A and the G⁰ Collaboration in Hall C at Jefferson Lab. Recently I joined a collaboration to improve the limits on the Electric-Dipole-Moment of the Neutron.

Education

7/10 Prof. of Physics at UKy

7/04 Assoc. Prof. of Physics at UKy

7/99 Asst. Prof. of Physics at UKy

10/96 Res. Asst. Prof. of Physics at UKy

12/93 Sen. Res. Fellow at Caltech

2/91 Postdoc. Fellow at MIT

4/90 Ph.D. in Nuclear Physics at Univ. of Marburg and MPI for Nucl. Physics (Heidelberg), Germany

4/87 Diploma in Physics at Univ. of Marburg and MPI for Nucl. Physics (Heidelberg), Germany

Present Graduate Students

Gretchen Phelps
Mukut Kalita
Mingyang Sun

Recent Selected Publications

S. Riordan et al., The Jefferson Lab Polarized ³He Collaboration, "Measurements of the Electric Form Factor of the Neutron up to Q²=3.4 GeV² using the Reaction ³He^->(e^->,e'n)pp", Phys. Rev. Lett. 105, 262302 (2010).
W. Korsch, "The SNS Neutron EDM Experiment", Nucl. Phys A, PANIC 2008, 667 (2009).
A. Deur, V. Burkert, J.P. Chen, W. Korsch, "Determination of the effective strong coupling constant alpha(s,g(1))(Q²) from CLAS spin structure function data", Phys.Lett. B665, 349 (2008).
P. Solvignon e al., The Jefferson Lab Polarized ³He Collaboration, "Quark-Hadron Duality in Neutron (He-3) Spin Structure", Phys.Rev.Lett. 101, 182502 (2008).
D. S. Armstrong et al., The G0 Collaboration, "Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment", nucl-ex/0506021 (2005).
K. Kramer et al., "The Q²-Dependence of the Neutron Spin Structure Function gⁿ₂ at Low Q²", nucl-ex/0506005 (2005).
W. Korsch, "Higher Twists and the Measurments of g₂", AIP Conf.Proc.747:122-125 (2005).
Z.E. Meziani et al. "Higher Twists and Color Polarizabilities in the Neutron", Phys.Lett.B613:148-153 (2005).
A. Deur et al., "Experimental Determination of the Evolution of the Bjorken Integral at Low Q²", Phys.Rev.Lett.93:212001 (2004).
M. Amarian et al., "Measurement of the Generalized Forward Spin Polarizabilities of the Neutron", Phys.Rev.Lett.93:152301 (2004)
W. Korsch, "Nucleon Spin Structure", Acta Phys.Hung.A21:301-306 (2004).
X. Zheng et al., "Precision Measurement of the Neutron Spin Asymmetries and Spin-Dependent Structure Functions in the Valence Quark Region", Phys.Rev.C70:065207 (2004).
M. Amarian et al., "Q² Evolution of the Neutron Spin Structure Moments using a He-3 Target", Phys.Rev.Lett.92:022301 (2004).
D.T. Spayde et al., "The Strange Quark Contribution to the Proton's Magnetic Moment", Phys.Lett.B583:79-86 (2004).
T.M. Ito et al., "Parity Violating Electron Deuteron Scattering and the Proton's Neutral Weak Axial Vector Form-Factor", Phys.Rev.Lett.92:102003 (2004).
X. Zheng et al., The Jefferson Lab Polarized ³He Collaboration, ``Precision Measurement of the Neutron Spin Asymmetry A₁ⁿ in the Large x_Bj Region'', Phys.Rev.Lett.92:012004 (2004).
W. Xu et al, The Jefferson Lab Polarized ³He Collaboration, "PWIA Extraction of the Neutron Magnetic Form Factor from Quasi-elastic He-3(pol.)(e(pol.),e') at Q² = 0.3-(GeV/c)² to 0.6-(GeV/c)^2'", Phys. Rev. C 67, 012201 (2003).
M. Amarian et al., The Jefferson Lab Polarized ³He Collaboration, "The Q² Evolution of the Generalized Gerasimov-Drell-Hearn Integral for the Neutron using a ³He Target''; Phys. Rev. Lett. 89, 242301 (2002).
W. Korsch, "Spin Physics with Polarized ³He'', published in: Charlottesville 2002, Testing QCD through Spin Observables in Nuclear Targets, World Scientific, 249-255 (2002).
W. Korsch,``Studies of the Neutron Spin Structure at Jefferson Lab''; Europ. Phys. J. A 1754, Electron-Nucleus Scattering VII, Elba International Physics Center, Italy, 2002.