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Particle Seminar, Tuesday, October 1, 2013 @ 4:15pm

Tuesday, October 1, 2013  4:15 PM

Harvard University
Particle Seminar

Title: "Review of the proton radius puzzle: is it about the proton or muon ?"
Maxim Pospelov

Jefferson Lab, 453
Refreshments in the high energy theory coffee area, 4th floor Jefferson,
at 4:00.

Recent measurements of the Lamb shift in muonic hydrogen (and deuterium) 
when interpreted in terms of the proton charge radius reveal a puzzling ~7 sigma 
discrepancy compared to r_p determination in other systems. I discuss this problem 
from several angles, and focus on theoretical speculations about possible new "medium-range" forces that skew the interpretations of the muH Lamb shift measurements.