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SEQUENCE:0
UID:UW-Physics-Event-3691
DTSTART:20150324T210000Z
DTEND:20150324T220000Z
DTSTAMP:20260419T143006Z
LAST-MODIFIED:20150323T183225Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Dynamical Pion Collapse and Neutrino Beam Coherence\, Theory S
 eminar (High Energy/Cosmology)\, Benjamin Jones\, MIT
DESCRIPTION:Neutrino oscillations are the first and only observed phen
 omena beyond the standard model\, and measuring the parameters which g
 overn them is a major area of current research. The textbook theoretic
 al treatment of neutrino oscillations\, however\, is known to be both 
 approximate and inconsistent.  The range of its validity is debated\, 
 with some estimates suggesting that neutrino coherence loss could occu
 r in existing experiments\, especially if heavier\, sterile neutrinos 
 participate in the oscillation.  All calculations of these effects to 
 date require an assumption about the initial neutrino state\, usually 
 obtained by dimensional analysis\, and spanning several orders of magn
 itude between treatments.  In this talk I will show that derivation of
  neutrino coherence properties without an arbitrary initial-state assu
 mption is possible if the neutrino beam is properly treated as an open
  quantum system.  I will present the first such calculation\, where th
 e full oscillation phenomenology of neutrinos produced in accelerator 
 neutrino beams is derived without arbitrary spatial scales at the neut
 rino production vertex.  The resulting range of validity of the typica
 l neutrino oscillation formalism will then be discussed.
URL:https://www.physics.wisc.edu/events/?id=3691
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