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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-5410
DTSTART:20200403T190000Z
DTEND:20200403T200000Z
DTSTAMP:20260415T041158Z
LAST-MODIFIED:20200330T190540Z
LOCATION:Zoom link will be available here: https://sites.google.com/st
 anford.edu/virtual-amo-seminar/schedule
SUMMARY:Virtual AMO Seminar Series\, Atomic Physics Seminar\, Vladan V
 uletic\, MIT
DESCRIPTION:Recently it has been proposed to search for particles outs
 ide the Standard Model (SM) in an intermediate mass range by means of 
 precision isotope shift spectroscopy on narrow optical transitions. We
  perform such a measurement on two S → D transitions for five bosoni
 c isotopes of Yb+ with an accuracy of ~ 300Hz\, and observe a nonlinea
 rity at the 3.3 σ level in the corresponding King plot. Such a nonlin
 earity can indicate physics beyond the SM\, or higher-order effects wi
 thin the SM. We identify the second-order field shift as the leading-o
 rder effect within the SM for Yb+. The observed nonlinearity pattern i
 s consistent with both the second-order field shift\, and with an unkn
 own boson\, but larger than expected from either source. In the future
 \, more precise measurements on more transition available for Yb+ and 
 Yb can be used to distinguish between effects within and outside the S
 M.
URL:https://www.physics.wisc.edu/events/?id=5410
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