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SUMMARY:The Leptonic Dirac CP Phase from Residual Symmetry and Muon Decay 
 at Rest Experiment - Shao-Feng Ge (MPIK Heidelberg)
DTSTART:20161021T150000Z
DTEND:20161021T160000Z
UID:TALK67518@talks.cam.ac.uk
CONTACT:Tevong You
DESCRIPTION:With the 1-3 mixing angle measured at reator neutrino experime
 nts\, Daya Bay and RENO\, there are still three unknown oscillation variab
 les\, the neutrino mass hierarchy\, the octant of the atmospheric mixing a
 ngle\, and the leptonic CP phase. Of these three\, the CP phase is the mos
 t difficult to measure precisely and important for distinguishing flavor s
 ymmetries. I will first talk about residual symmetries\, which takes the r
 ole as low energy effective field theory for neutrino mixing and is analog
 y of custodial symmetry in the electroweak sector\, to predict the CP phas
 e from the measured mixing angles. Then I introduce a new type of neutrino
  experiment to measure the CP phase. Currently\, T2K\, NOvA\, and DUNE are
  designed for CP measurement. Nevertheless\, they suffer from problems of 
 degeneracy\, efficiency\, uncertainty\, non-unitary mixing and non-standar
 d interaction. All of them can be improved by simply adding a muon decay a
 t rest (muDAR) source to T2(H)K\, for example. The same configuration can 
 also apply to next-generation medium baseline reactor neutrino experiments
  like JUNO and RENO-50\, enhancing their physics potential. With only one 
 source and no extra detectors\, this dessign is much better than DAEdLAS w
 hich requires 3 sources\, but only 20% duty factor and 4 times higher lumi
 nosity for each.\n\nRefs:\n\nSFG\, Duane A. Dicus\, Wayne W. Repko\, PLB 7
 02\, 220 (2011) [arXiv:1104.0602]\nSFG\, Duane A. Dicus\, Wayne W. Repko\,
  PRL 108\, 041801 (2012) [arXiv:1108.0964]\nAndrew D. Hanlon\, SFG\, Wayne
  W. Repko\, PLB 729\, 185-191 (2014) [arXiv:1308.6522]\nJarah Evslin\, SFG
 \, Kaoru Hagiwara\, JHEP 1602 (2016) 137 [arXiv:1506.05023]\nSFG\, Pedro P
 asquini\, Mariam Tortola\, Jose W.F. Valle [arXiv:1605.01670]\nSFG\, Alexe
 i Smirnov\, to appear in JHEP [arXiv:1607.08513]
LOCATION:MR15\, DAMTP
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