# Previous Michelson Postdoctoral Prize Lectureships

## Friday, May 14, 2010 , 12:30 p.m. in Miller Room

David Hanneke, NIST

#### High-Energy Physics with Low-Energy Symmetry Studies

Discrete symmetries -- charge conjugation (C), parity inversion (P), time
reversal (T), and their combinations -- provide insight into the structure
of our physical theories. Many extensions to the Standard Model predict
symmetry violations beyond those already known. From the first evidence of
P-violation in the 1950s using cold atoms, low-energy, high-precision
experiments have quantified existing violations and constrained further
ones. In this lecture, I will describe several searches for discrete
symmetry violations with low-energy experiments. T-violation, closely
related to matter/antimatter asymmetry through the CPT theorem, is tightly
constrained by searches for intrinsic electric dipole moments. CPT-violation
-- the only combination of these symmetries obeyed by the entire Standard
Model -- is constrained in leptons by comparisons of the electron to the
positron and in baryons by comparisons of the proton to the antiproton.
Ongoing work with antihydrogen aims to further constrain CPT-violation in
both these sectors.

Download David's Slides for this talk.

Download David's Slides for this talk.

Host: Harsh Mathur