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SUMMARY: Leading hadronic contribution to the muon magnetic moment from la
 ttice quantum chromodynamics - Laurent Lellouch (CNRS &amp\; Aix-Marseille
  U.)
DTSTART:20210611T150000Z
DTEND:20210611T160000Z
UID:TALK159805@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:*The seminar will take place via Zoom "here":https://maths-cam
 -ac-uk.zoom.us/j/95215212460?pwd=TWN5cjJ3azErSUYremw5UWRKL0NKUT09.*\n\nAbs
 tract: \nTwenty years ago in an experiment at Brookhaven National Laborato
 ry\, physicists measured the muon's anomalous magnetic moment\, $a_\\mu=(g
 _\\mu-2)/2$\, with a remarkable precision of 0.54 parts per million. Since
  then\, the standard model prediction for $a_\\mu$ has exhibited a discrep
 ancy with experiment of over 3 standard deviations\, raising the tantalizi
 ng possibility of physical particles or forces as yet undiscovered. On Apr
 il 7 a new experiment at Fermilab presented its first results\, brilliantl
 y confirming Brookhaven's measurement and bringing the discrepancy with th
 e standard model to a near discovery level of 4.2 sigma. To fully leverage
  this and future measurements\, and possibly claim the presence of new fun
 damental physics\, it is imperative to check the standard model prediction
  with independent methods\, and to reduce its uncertainties. After an intr
 oduction and a discussion of the current experimental and theoretical stat
 us of $a_\\mu$\, I will present a precise lattice QCD calculation\, by the
  BMW collaboration\, of the contribution to this quantity that most limits
  the precision of the standard model prediction.  The result of this calcu
 lation significantly reduces the gap between the standard model and experi
 ment\, and suggests that new physics may not be needed to explain the curr
 ent\, experimental\, world-average value of $a_\\mu$.\n\nThe slides are av
 ailable "here":https://www.hep.phy.cam.ac.uk/~conference/Lellouch_2021-06-
 11.pdf
LOCATION:Virtual Seminar 
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