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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2774
DTSTART:20121002T200000Z
DURATION:PT1H0M0S
DTSTAMP:20260316T060915Z
LAST-MODIFIED:20120912T133016Z
LOCATION:4274 Chamberlin
SUMMARY:Updated results from the T2K long baseline neutrino experiment
 \, High Energy Seminar\, Kendall Mahn\, TRIUMF
DESCRIPTION:An unresolved problem in the Standard Model is the observe
 d presence<br>
\nof matter and lack of corresponding antimatter in the
  universe. To<br>
\nexplain the matter-antimatter asymmetry\, Sakharov
  suggested three<br>
\nconditions had to be met: that baryon number is
  violated\, CP violation<br>
\nand that matter and antimatter are out 
 of thermal equilibrium. A<br>
\nsufficient source of CP violation coul
 d be from new physics in the<br>
\nquark sector\, or in the lepton sec
 tor within neutrino mixing.<br>
\n<br>
\nThe conversion of muon neutri
 nos to electron neutrinos\, nue<br>
\nappearance\, is sensitive to CP 
 violation between the light neutrinos\,<br>
\nwhich can be related to 
 CP violation of a hypothetical heavy neutrino<br>
\nin the early unive
 rse to meet Sakharov's conditions. However\, nue<br>
\nappearance is a
 lso dependant on precision measurements of other mixing<br>
\nparamete
 rs\, including Dm2(32)\, theta(23) and theta(13). The<br>
\nTokai-To-K
 amioka (T2K) long baseline neutrino experiment is designed<br>
\nto pr
 ecisely measure muon neutrino disappearance (Dm2(32)\, theta(23))<br>

 \nand nue appearance. The experiment uses a beam of muon neutrinos<br>
 
\ngenerated at the J-PARC facility in Tokai-mura\, Japan\, which is<b
 r>
\nsampled by two near detectors\, ND280 and INGRID\, before reachin
 g the<br>
\nSuper-Kamiokande detector\, 295km away. Since the March 20
 11<br>
\nearthquake\, T2K has recovered\, resumed and updated the nue 
 appearance<br>
\nanalysis with an increased data set corresponding to 
 3.01e20 protons<br>
\non target (at 15.5 kW x 10^7 s). This seminar wi
 ll highlight T2K's<br>
\nincredible recovery and analysis improvements
 \, and discuss prospects<br>
\nfor future neutrino-based searches for 
 CP violation in the lepton<br>
\nsector.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=2774
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