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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2670
DTSTART:20120517T193000Z
DTEND:20120517T203000Z
DTSTAMP:20260309T185408Z
LAST-MODIFIED:20120508T031522Z
LOCATION:4274 Chamberlin
SUMMARY:Probing Time-reversal Invariance with  Atoms and Neutrons\, NP
 AC (Nuclear/Particle/Astro/Cosmo) Forum\, Tim Chupp\, University of Mi
 chigan
DESCRIPTION:Time reversal is not a perfect symmetry of nature as evide
 nced by decays of K and B mesons. This means that physical processes a
 nd even the properties of atoms and elementary particles would change 
 with the reversal of time. Assuming charge-conjugation-parity (CPT) in
 variance\, T- invariance implies CP invariance\, an essential element 
 of baryogenesis\, the generation of more matter\, compared to antimatt
 er\, in the early universe. CP-invariance violation has been observed 
 in the decays of K and B mesons\, and is incorporated into the Standar
 d Model of particle physics\, but it it not sufficient to produced the
  observed baryon asymmetry. So we search on for new manifestations of 
 CP or T invariance violation. Observing a permanent electric dipole mo
 ment of an atom or the neutron (sometimes called the Z=0 atom) would b
 e direct evidence of T violation and would set the scale for new physi
 cs that could generate the baryon asymmetry. T-violating observables i
 n neutron decay include the correlations of neutron spin with the prot
 on and electron momentum. I will discuss EDM experiments using rare is
 otopes as well as neutron experiments including the recently complete 
 emiT-II experiment.
URL:https://www.physics.wisc.edu/events/?id=2670
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