[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Friday, January 15, 2010
l:00 p.m.
CEBAF Center, Room L104

Mikhail Gorshteyn
University of Indiana at Bloomington

*Dispersion Corrections to Electron Scattering With and Without Parity 
Violation
*
I give a brief overview of the current status of the theory of two-boson 
exchange corrections to elastic electron scattering. As a practical 
application, I consider the dispersion correction due to $\gamma Z$ 
exchange in the forward regime. In the exact forward limit, this 
correction is fixed by a sum rule that involves the $\gamma 
Z$-interference "cross section", and can be calculated directly from 
experimental data. In absence of such data, I discuss how inclusive 
electromagnetic data may be used to predict the value of the dispersion 
correction to the weak charge of the proton, and show how the model 
dependence of this procedure can be estimated.

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