[Jlab-seminars] Physics Seminar: Dr. Douglas Higinbotham; Why the proton radius is smaller in Virginia

[Stephanie Tysor]

*Physics Seminar*

*Dr. Douglas Higinbotham*

**

*Jefferson Laboratory*

Why the proton radius is smaller in Virginia//

//

*Abstract:*

/Recent Muonic hydrogen Lamb shift measurements have determined the 
proton's charge radius to be 0.84 fm, a result systematically different 
from the CODATA value of 0.88 fm from atomic hydrogen Lamb shift and 
recent electron scattering results.  I will review the history of the 
electron results, starting from the 1963 review article by Hand et al. 
with its 0.81(1)fm standard dipole radius, and track the evolution of 
the proton charge radius up to the recent 0.88(1)fm results from Mainz. 
I will then discuss why groups in Virginia (JLab, UVA, and W&M) are 
extracting a radius from the electron scattering data close to the 
Muonic result. I will also show how PRad will hopefully settle the issue./

**

*Friday, May 13, 2016*

*11:00 am*

*CEBAF Auditorium*

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