Thursday, October 11, 2018

2018: The Proton Radius Puzzle - Why We All Should Care

[1809.09635] The Proton Radius Puzzle- Why We All Should Care

Abstract: The status of the proton radius puzzle (as of the date of the Confer- ence) is reviewed. The most likely potential theoretical and experimental explanations are discussed. Either the electronic hydrogen experiments were not sufficiently accurate to measure the proton radius, the two- photon exchange effect was not properly accounted for, or there is some kind of new physics.

[1809.06373] Proton charge radius extraction from electron scattering data using dispersively improved chiral effective field theory

Abstract: We extract the proton charge radius from the elastic form factor data using a theoretical framework combining chiral effective field theory and dispersion analysis. Complex analyticity in the momentum transfer correlates the behavior of the spacelike form factor in different $Q^2$ regions and permits the use of data up to $Q^2 \sim$ 0.5 GeV$^2$ in constraining the radius.

The work done by the 4th Order Polynomial paper solves all of this and it is a refinement of Haramein’s work: