g-2 of the muon from lattice QCD and experiments: 4.2 sigma?

by Prof. Zoltan Fodor (BUG Wuppertal)

Tuesday 13 Apr 2021, 16:45 → 18:00 Europe/Berlin

Zoom (DESY, Zeuthen)

Twenty years ago, in an experiment at Brookhaven National 
Laboratory, physicists detected what seemed to be a 
discrepancy between measurements of the muon’s magnetic moment
and theoretical calculations of what that measurement should
be, raising the tantalizing possibility of physical particles
or forces as yet undiscovered. The Fermilab team has just 
announced that their precise measurement supports this 
possibility. The reported significance for new physics is 
4.2 sigma just slightly below the discovory level of 5 sigma. 
However, an extensive new calculation of the muon's magnetic 
moment using lattice QCD by the BMW-collaboration reduces the 
gap between theory and experimental measurements. The lattice
result appeared in Nature on the day of the Fermilab
announcement. In this talk both the theoretical and 
experimental aspects are summarized with two possible 
narratives: 
a) almost discovery or 
b) Standard Model re-inforced.
Some details of the lattice caluculation are also shown.
 

This is a VIDEO COLLOQUIUM!

Connection details:

 https://desy.zoom.us/j/99616528733

Meeting ID: 996 1652 8733
Meeting Password: 733220