Description:

Title: Proton puzzles at the precision frontier

Speaker: Jan Bernauer, MIT
 

Abstract: 

The nucleon and its structure are the focus of intense study on all
energy scales, in both current and upcoming experiments. It is one of
the simplest systems in non-perturbative QCD and the accurate
description of its properties are a touchstone for theoretical
calculations.

However, many properties of the proton, for example mass and spin, are
still puzzling. Recent precision experiments have highlighted two areas
where we do not understand how nature works: the proton radius and the
form factor ratio discrepancy. The former, still unsolved, may have opened
the door to the discovery of physics beyond the Standard Model. While a
solution for the latter seems in reach, the precision results of OLYMPUS
prove theoretical calculations to be incomplete.

In this talk, I will discuss the Mainz high precision form factor
measurement and global form factor analysis, which are corner stones of
the radius puzzle, and the results of the OLYMPUS experiment, set up to
study the form factor ratio discrepancy.

I will close with a short description of ongoing and future precision-frontier
experiments like MUSE and DarkLight.

Keywords: Physics, Astronomy, HEP