BNL Physics Colloquia

The proton remains puzzling, Haiyan Gao (Duke)

Name: The proton remains puzzling, Haiyan Gao (Duke)
Start: 2020-01-07T15:30:00-05:00
End: 2020-01-07T16:30:00-05:00
Location: No location set

Tuesday 7 Jan 2020, 15:30 → 16:30 US/Eastern

Description

Abstract:

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.

Organised by

Xin Qian