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LBL Oscillation Physics @WIN05. H. Minakata (Tokyo Metropolitan U.). n oscillatory behavior has been seen!. SK. K2K. KamLAND. What is left #1: q 13 (There are 2 ways). LBL vs. reactor. What is left #2: mass hierarchy. What is left #3: CP violation. Shoichi Sakata. Ziro Maki.
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LBL Oscillation Physics@WIN05 H. Minakata (Tokyo Metropolitan U.)
n oscillatory behavior has been seen! SK K2K KamLAND Hisakazu Minakata
What is left #1: q13 (There are 2 ways) LBL vs. reactor Hisakazu Minakata
What is left #2: mass hierarchy Hisakazu Minakata
What is left #3: CP violation Shoichi Sakata Ziro Maki Lepton-quark correspondence ? • Relation to cosmic baryon number? Hisakazu Minakata
Closest possibility: J-PARC phase II T2K phase-I: The unique LBL experiment funded ! • JPARC accelerator upgraded to 4MW • Hyper-Kamiokande of 1 Mton (fiducial volume = 0.54 Mton) Hisakazu Minakata
There are competitive ideas/plans, e.g., NOA High-gamma beta beam Hisakazu Minakata
For me it is natural to think about J-PARC phase II project for many reasons, but it has a serious problem… Hisakazu Minakata
A half of the sensitivity region is obscured O. Yasuda, @NOON04 Hisakazu Minakata
Why so much ambiguity by sign(Dm2) degeneracy? The reason is: • Large d2 - d1 (= p/2 ~ p) in overlapping region of different-sign Dm2 ==> CPC-CPV confusion One has to solve sign-degeneracy to determine Hisakazu Minakata
T2KK, or Resolving neutrino mass hierarchy and CP degeneracy by Komioka-Koreatwin Hyper-Kamiokande Based on: M. Ishitsuka, T. Kajita, HM, H. Nunokawa, hep-ph/0504026
There are cultural,philosophical, diplomatic,string-theoretical reasons for T2KK apart from scientific ones Hisakazu Minakata
Korea is booming in Japan ! 韓流ブーム Hisakazu Minakata
Korea is booming in Japan continued Hisakazu Minakata
Current design of Hyper-Kamiokande contains 2 tanks ! Why don’t you bring one of the 2 tanks to Korea? Hisakazu Minakata
Yes, we are the neighbours Taken from Hagiwara et al. Hisakazu Minakata
Sign confusion in Korea is as severe as in Kamioka Hisakazu Minakata
Where is the right place? How different are P’s of 2 degenerate solutions @Kamioka Hisakazu Minakata
What is the difference: 1st-1st OM Hisakazu Minakata
Energy dependence far more dynamic at 2nd OM ! What is the difference: 1st-2nd OM Hisakazu Minakata
high-E(1st-1st OM) vs. low-E(1st-2nd OM) Hisakazu Minakata
Spectral information solves degeneracy Hisakazu Minakata
T2K(0.54 Mt) vs. T2KK(0.27+0.27 Mt) Hisakazu Minakata
T2K(0.54 Mt) vs. T2KK(0.27+0.27 Mt) Hisakazu Minakata
T2KK can resolve mass hierarchy keeping CP sensitivity hierarchy CP thick: 3 thin: 2 Hisakazu Minakata
Power of 2 identical detectors Systematic errors cancel between 2 HK ! • Modest requirement of 5% systematic errors is enough to guarantee the great sensitivity to CP violation and mass hierarchy ! Hisakazu Minakata
Results insensitive to systematic error ! Hisakazu Minakata
T2KK vs. NOA; mass hierarchy thick: 3 thin: 2 T2K II Hisakazu Minakata
T2KK vs. NOA; CP thick: 3 thin: 2 Hisakazu Minakata
T2KK vs. super-NOA; mass hierarchy 95% CL dashed/ solid w/o proton D thick: 3 thin: 2 Mena-Palomares-Ruiz-Pascoli; L2nd=200 km Hisakazu Minakata
Conclusion • People started to explore various 2 detector setups for determining CP & mass hierarchy in the context of conventional superbeam • There are two options; 1st-1st OM and 1st-2nd OM. They differ in spectral properties => require different strategy • T2KK improves the original T2K II proposal with no extra cost by adding ability to determine mass hierarchy while keeping sensitivity to CP violation Hisakazu Minakata
Supplementary sheets Hisakazu Minakata
2 and background • 5% errors are assumed Hisakazu Minakata
Events vs. selectionsDm2=2.5x10-3eV2,sin22q13=0.1 Mine@NP04 workshop (events / 22.5kt / 5yrs) (stat.) (stat.) (stat.) (old p0 fitter: 12 15 109) Hisakazu Minakata
Stability of the results Hisakazu Minakata