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Colloquium: Matthew Bressler (U Mass)

Feb 26, 2024 - 4:10 PM
to Feb 26, 2024 - 5:10 PM

Speaker: Matthew Bressler (U Mass)

Host:  Marzia Rosati, Srimoyee Sen

Title: Updated Results from Runs 2 and 3 of the Muon g-2 Experiment at Fermilab

Abstract: Due to their relatively high mass and long lifetime, muons are an attractive probe for the potential existence of physics beyond the Standard Model. The Muon ๐‘”โˆ’2 experiment studies the precession of muonsโ€™ spins as they orbit in the magnetic field of a 7.112 m radius circular storage ring, with the goal of making the most precise measurement of the so-called โ€œanomalousโ€ magnetic moment, namely the factor ๐‘Ž ๐œ‡=๐‘”๐œ‡โˆ’22, which arises from the muonsโ€™ interactions with virtual particles during their interaction with the magnetic field. In August 2023 the Muon ๐‘”โˆ’2 collaboration released our newest result from data collected in 2019 and 2020, which included a factor of 4 more statistics than the Run-1 result from data collected in 2018 and more than a factor of 2 improvement in systematic uncertainties over the previous measurement, resulting in a total uncertainty of 0.20 ppm on the factor ๐‘Ž ๐œ‡. In this talk, I will describe the principles of the ๐‘”โˆ’2 measurement, discuss some of the improvements made on the systematic errors, and briefly summarize the experimentโ€™s progress since 2020, looking ahead to the next results.