Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268


Thu., November 06, 2014, at 3:00 PM - 4:00 PM (refreshments served at 2:40 PM)

Studying the Proton Radius Puzzle

Katherine Elizabeth Mesick, Rutgers University, Piscataway, NJ
ORNL, Bldg. 6008 Large Conference Room

The proton radius puzzle has existed since 2010, when a precise measurement of the proton's charge radius from the Lamb shift in muonic hydrogen found with high significance a 4% smaller value than the expected value based on previous measurements using atomic hydrogen and electron scattering. The discrepancy is now greater than 7 standard deviations, and while many theories have been proposed to explain the discrepancy, none is generally favored as a resolution to the puzzle. Possible solutions to the puzzle include new physics Beyond the Standard Model, new novel hadronic physics, or issues in the experimental extractions of the radius. This talk will review the proton radius puzzle, discuss possible solutions to the puzzle, and will give an overview of the experiments aimed at solving the puzzle, with a focus on the MUon Scattering Experiment (MUSE) that will measure both electron- and muon-proton scattering to high precision, testing the interesting possibility that electrons and muons behave differently.

Contact: Alfredo-Galindo Uribarri, (865) 574-6124