No Colloquium on 02/09. We will resume the regular series soon.
Apr19
A New Measurement of the Positive Muon Anomalous Magnet Moment to 0.46 ppm
Hogan Nguyen, Fermilab
Monday, April 19, 2021
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3:30 p.m.–4:30 p.m. PT
I present a new measurement of the positive muon anomalous magnetic moment a_μ=(g_μ-2)/2 from the Fermilab E989 experiment. The quantity a_μ is an exquisite probe of the quantum corrections of the muon interaction with the electromagnetic field. The experiment is a follow up of the BNL E821 experiment, which saw a 3.7σ discrepancy from the Standard Model. Due to the implications of possible new physics, it is of great interest to either confirm or refute the BNL result. Our experimental technique utilizes the muon storage ring that was moved from BNL to Fermilab in 2015. I will review the theory predictions and present our experimental technique, highlighting the innovations made by E989. I present our first result based on a data set consisting of about 8 billion analyzed muon decays. This result, representing only 6% of our expected final dataset, achieved an error of 0.46 ppm which is comparable to the BNL result.
About Hogan Nguyen
I received my PhD from the University of Chicago and joined Fermilab as a postdoc in 1992. I received a Fermilab Wilson Fellowship in 1999, and currently hold the title of Senior Scientist. I have been a member of the Fermilab Muon g-2 experiment since 2012. I was the lead scientist overseeing the technical aspects of the apparatus transportation from BNL to Fermilab. I was the L2 project manager overseeing the storage ring reassembly during the project phase, and then was the Operations Manager during the first two years of data collection.
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