Congratulations to Professor Eric Hessels in the Department of Physics & Astronomy for receiving the President’s Research Excellence Award 2020, in recognition of his exceptional contributions to atomic, molecular and optical physics.

Hessels, York Research Chair in Atomic Physics and a York University Distinguished Research Professor, has led numerous research projects that have far-reaching consequences for the understanding of the laws of physics. He is leading a collaboration whose goal it is to use ultra precise measurements of the electron to study one of the fundamental unresolved questions of physics.

In 2019, Hessels led a study published in the esteemed journal Science, which found a new measurement for the size of proton at just under one trillionth of a millimetre. The study confirmed the 2010 finding that the proton is smaller than previously believed.

The year before, Hessels led a team that achieved the most precise measurement of the fine structure of helium ever recorded. His researchers had been working on this for eight years. Hessels is now leading a collaboration (EDMcubed) that is attempting to measure the shape of the electron — or, more specifically, whether its charge is evenly distributed. This measurement will try to shed light on one of the fundamental mysteries of physics: why the universe is made entirely of matter (electrons,protons, etc.) and, unexpectedly, has no antimatter (anti-electrons, antiprotons, etc.).

See the full story in yFile.