Nuclear Physics Seminars

ics Nuclear
Tuesday, February 2, 2016
3:30 PM
Physics Building, Room 204
Doug Higinbotham [Host: Blaine Norum]
"Why the Proton Radius is Smaller In Virginia"
 Slideshow (PDF)

Recent Muonic hydrogen measurements have determined the proton's charge radius to be 0.84fm, a result systematically different from both the atomic hydrogen results and electron scattering results of ~0.88fm.  In an effort to under this "puzzle",  I will present, from a historical perspective, how the proton's charge radius has been  extracted from electron scattering data starting with the 1963 review article by Hand et al., with its 0.81(1)fm standard dipole radius and working my way to up the ~0.88(1)fm 2014 results from Mainz.   I will then discuss why groups in Virginia (JLab, UVA, and W&M) are extracting a radius very close to the Muonic result as well as discuss some of the pitfalls of multivariate fitting.


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