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CATEGORIES:Physics and Astronomy Colloquia
SUMMARY:Tabletop Tests of the Standard Model and Beyond:
A Tale of Two Electron Dipole Moments - Gerald Gab
rielse - Northwestern/Harvard
DTSTART:20201014T150000Z
DTEND:20201014T160000Z
UID:TALK4261AT
URL:/talk/index/4261
DESCRIPTION:The standard model of particle physics -- a set of
particles\, interactions and symmetries knitted t
ogether by field theory -- is the great triumph an
d the great frustration of modern physics. The gr
eat triumph is its ability to predict the outcome
of laboratory tests with exquisite precision. The
great frustration is its inability to account for
basic features of the universe\, like how it surv
ives annihilation after the big bang\, why it is m
ade of matter rather than antimatter\, why does gr
avity not fit well\, what is dark matter\, etc. T
he magnetic and electric dipole moments of the ele
ctron\, measured using completely differently meth
ods\, illustrate the crucial role of tabletop meas
urements for testing the standard model and beyond
. \n\nThe electron's magnetic moment\, determined
to 3 parts in 10^{13}\, is the most precisely det
ermined property of an elementary particle. The m
easurement with a one-electron quantum cyclotron t
ests the most precise prediction of the standard m
odel. A ten times more precise measurement is cur
rently being pursued in light of an intriguing 2.4
standard deviation discrepancy that has recently
emerged between the measurement and the prediction
. A positron measurement at the new precision sho
uld provide a 200 times improved test of the stand
ard model's fundamental CPT symmetry invariance wi
th leptons. \n\nThe electron electric dipole\, me
asured using the incredibly strong internal field
on valence electrons within cold molecules in a co
ld beam\, is an extremely sensitive probe for phys
ics beyond the standard model. The standard model
requires 4th order perturbation theory to produce
the CP violation needed for an electric dipole\,
while supersymmetric models and other proposed bey
ond-the-standard-model improvements predict much l
arge electric dipoles moments from first order per
turbation theory. Following two previous order-of
-magnitude improvements in sensitivity\, a new mea
surement seeks to improve the sensitivity by anoth
er order of magnitude.
LOCATION:https://bham-ac-uk.zoom.us/j/96072052168?pwd=V2pIZ
lZvd3BHZW9GRGF0TCt6OTc1dz09
CONTACT:Amaury Triaud
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