First results from the Fermilab g-2 experiment

04/16/2021 - 4:00pm to 5:00pm
Speaker(s) / Presenter(s): 
Renee Fatemi (University of Kentucky)

Joint UK/VCU colloquium. Note that it starts at 4pm. Zoom link wil be emailed to you.


Fifteen years ago the g-2 experiment at Brookhaven National Laboratory published a 540 part-per-billion measurement of the anomalous magnetic moment of the muon,  $a_\mu = (g_\mu-2)/2$.  At the time this value was larger than the theoretical Standard Model calculation by nearly 3$\sigma$, a deviation that has grown to 3.7$\sigma$ as the error on the theoretical calculations steadily decreased.  The new muon g-2 experiment at Fermilab  (E989) aims to reduce the errors on $a_\mu$ by a factor of four and shed light on this growing discrepancy.  When combined with the expected improvements in the Standard Model calculations E989 should be able to definitively conclude if the Brookhaven result is due to unknown particles or forces. This talk will present an important step towards this goal,  a 460 part-per-billion measurement of  $a_\mu$ from the data collected during the first E989 experimental running period in 2018. 

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