Colloquium – Breese Quinn – Latest Results from the Fermilab Muon g-2 Experiment

Speaker: Dr. Breese Quinn (University of Mississippi)

Title: Latest Results from the Fermilab Muon g-2 Experiment

Abstract:

Two years ago, the Muon g-2 experiment at Fermilab published its first measurement of the anomalous magnetic moment of the muon, a_μ = (g-2)/2, based on its first year of data representing roughly 6% of the total data collection which concluded in July of this year. That Run 1 result confirmed an earlier Brookhaven National Laboratory measurement, and led to a discrepancy of 4.2 σ with the 2020 consensus Standard Model prediction. This talk will present Muon g-2’s new ultra-precise 0.2 ppm Run 2/3 result, which improves on the previous measurement by more than a factor of 2 in both statistical and systematic uncertainty, putting the experiment ahead of schedule in reaching its ultimate design goal of 140 ppb precision. I will discuss the experimental and analysis techniques, focusing on improvements since Run 1, current status of the a_μ measurement, and prospects for the complete Muon g-2 physics program.

Bio:

After earning a BS in physics at Mississippi State University, Dr. Quinn received his PhD from the University of Chicago and joined Fermilab as a Lederman Postdoctoral Fellow in 2000. He came to the University of Mississippi in 2004, where he is a Professor in the Department of Physics and Astronomy and serves as the Director of the UM Center for Multimessenger Astrophysics.  He has been a member of several Fermilab experiment collaborations including E-791, KTeV, DØ, and Muon g-2.  On Muon g-2, his group has filled leadership roles in beam dynamics, and he serves as the CPT/Lorentz Invariance Violation and Dark Matter analysis group coordinator. On the side, he has been active in advocacy for HEP funding his entire career, having conducted more than 750 meetings with Congressional offices to date.

Host: Nobu Okada