[Jlab-seminars] Physics Seminar: Gerald Miller; Defining the proton radius: A unified treatment

[Stephanie Tysor]

Physics Seminar
Gerald Miller
University of Washington

Defining the proton radius: A unified treatment

Abstract:

There is significant current interest in knowing the value of the proton radius and also its proper definition.  I will combine the disparate literatures of hydrogen spectroscopy and diverse modern parton distributions to understand the meaning of the proton radius in a manner consistent with the separate bodies of work.  I will show that the very same proton radius is accessed by measurements of hydrogen spectroscopy and elastic lepton scattering. I will also show that the derivation of the mean-square radius as a moment of a spherically symmetric three-dimensional density is incorrect. A relativistically correct, two-dimensional charge density is related to the diverse modern literature of various parton distributions. Relativistically invariant moments thereof are derived in a new relativistic moment expansion, the RME. In conclusion, I will show that the equation r2p ≡ −6G′E(0) is the definition of the proton radius.



Friday, June 21, 2019
11:00am
CEBAF Center Auditorium



Stephanie Tysor
Thomas Jefferson National Accelerator Facility
Physics Division
Hall A Administrative Assistant
(office)757-269-6005<callto:757-269-6005> (fax)757-269-5235<callto:757-269-5235>

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