High Energy Physics Seminar

Speaker: Richard Hill, University of Chicago

Title:  Precision nucleon structure and fundamental physics: from the proton radius puzzle to leptonic CP violation

Refreshments available at 1:30 pm.

Date: Tue, 17 Jan 2017, 1:45 pm - 2:45 pm  

Type: Seminar

Location: 1400 BPS Bldg.

Abstract:
The discrepancy between the measured Lamb shift in muonic hydrogen and expectations from electron-proton scattering and hydrogen spectroscopy has become known as the proton radius puzzle, whose most "mundane" resolution requires a ∼5σ shift in the value of the Rydberg constant. I review the status of spectroscopic and scattering measurements, recent theoretical developments, and implications for particle physics.

Lessons learned from the proton radius puzzle have important implications for neutrino-nucleus cross sections at long baseline neutrino experiments exploring fundamental neutrino properties. I discuss the application of soft-collinear effective theory to radiative corrections in lepton-nucleus scattering, the potential impact of lattice QCD for neutrino physics, and the interplay with other processes such as muon capture and pion electroproduction.