The size of the Proton: Recent Results from the PRad Experiment

Date: 
02/28/2020 - 3:30pm to 5:00pm
Speaker(s) / Presenter(s): 
Ashot Gasparian (North Carolina A&T)

Two new extremely high precision measurements of the proton rms charge radius performed in 2010-2012 with muonic hydrogen atom demonstrated up to six standard deviations smaller values than the accepted average from all previous experiments performed with different methods (scattering and atomic spectroscopy) on regular hydrogen. This discrepancy triggered the well-known “proton radius puzzle” in hadronic physics. To address this puzzle, the PRad collaboration in May-June of 2016 performed a novel magnetic-spectrometer-free ep-scattering experiment in Hall B at Jefferson Lab accumulating high statistics and a rich experimental data set. The specifics of the PRad experiment and the final physics results, including the extracted proton radius, will be presented and discussed in this talk.

 

Host: Korsch

Colloquium will be held at Chemistry-Physics building (CP), 505 Rose street, room 155.

Refreshments with the speaker will be served at 3:00 pm in CP-179. 

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