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Effective March 10, 2020, all Duke-sponsored events over 50 people have been cancelled, rescheduled, postponed or virtualized.
Please check with the event contact regarding event status. For more information, please see https://coronavirus.duke.edu/events

Duke Physics Colloquium: The Proton Remains Puzzling

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Wednesday, February 19, 2020
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3:30 pm - 4:30 pm
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Haiyan Gao (Duke University Physics Department)
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Duke Physics Colloquium

"The Proton Remains Puzzling"

Nucleons (protons and neutrons) are the building blocks of atomic nuclei, and are responsible for more than 99% of the visible matter in the universe. Despite decades of efforts in studying its internal structure, there are still a number of puzzles surrounding the proton such as its spin, mass, and charge radius. The proton charge radius puzzle developed about ten years ago refers to a 5-7 sigma discrepancy between the ultrahigh precise values of the proton charge radius determined from muonic hydrogen Lamb shift measurements and the CODATA values compiled from electron-proton scattering experiments and hydrogen spectroscopy measurements. In this talk I will briefly introduce the proton spin and mass puzzles first. I will then focus on the proton charge radius puzzle, the latest experimental results, and especially the PRad experiment at Jefferson Lab and its result.

Faculty host: Joshua Socolar

Refreshments will be available before the event in room 130.

Image credit: Joanna Griffin, Jefferson Lab

Contact: Cristin Paul