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Road Map of Neutrino Physics in Japan
Largely my personal view
Don’t take too seriously
K. Nakamura KEK NuFact04 July 30, 2004
Road Map of Neutrino Physics in Japan
•Ongoing–Super-Kamiokande–K2K–KamLAND
•Constructing–T2K @ J-PARC
•R&D–Hyper-Kamiokande–XMASS–FFAG for Neutrino Factory
•Proposed–KASKA
•Double decay exp.42
m39m
C Scientific American
T2K Phase I: Measurement of sin2 2θ13
sin 2θ13 νμ(CC+NC) Bean νe Osc’d νe Signal+BG0.1 11.1 11.1 123.2 145.5
0.01 11.1 11.1 12.3 34.5
2sin22θ13
Δm2
×1/20CH
OOZ
limitJHF
sensitivity
Expected signal for
OA 2deg 5yrs
sin2213=0.1
Sensitivity for 13
sin2213~0.006 (90%)
sinsin22221313 < 10 < 10-3-3 can be searched if syst err ~ few % can be searched if syst err ~ few %
0.5xsin2213
sin2213~0.018 (3)
3 CP sensitivity : ||>20o for sin2213>0.01 with 2% syst.
4MW, 540kt2yr for
6~7yr for
sinsin
2sin4 13
12212
EmACP
m212=6.9x10-5eV2
m322=2.8x10-3eV2
12=0.59423=/4
T2K-I 90%
no BGsignal stat only
(signal+BG) stat only
stat+2%syst.stat+5%syst.
stat+10%syst.
CHOOZ excludedsin2213<0.12@m31
2~3x10-3eV2
T2K 3 discovery
T2K: CP Violation Sensitivity
Possible Phase 2 Intensity Upgradeof the J-PARC 50 GeV Ring
Ramping speed → 0.89 HzLattice magnet designed this way
Barrier bucketDecreases the local line density at injectionReduces the space charge effect
2 detectors×48m × 50m ×250m, Total mass = 1 Mton
Twin Detector Hyper-Kamiokande
Wished Construction Plan
2008 09
20 10
11
12
13
14
20 15
16
17
18
19
2020
21
22
23
T2K-I
HK construction
HK experiment
9
Japanese FFAG Scheme
10
Nufact at J-PARC
11
Staging Approach towards Realization
Long Baselines ?
J-PARC
Seoul
Beijing
Fukuoka
ShanghaiOr Hawaii ?
13
Construction of the PRISM-FFAG
14
Pulsed proton beam facility
Road Map of Neutrino Physics in Japan
Neutrino CP
Violation(If >20 deg)
Measurement of 13
J-PARC
Hyper-K
T2K Phase IIJ-PARC
IntensityUpgrade
T2K Phase I
Measurement of sgn(m23
2 )
FFAG R&DNeutrino factory
If 13 is not too small (sin2213 > 0.02)
We are here.
Super-KK2KT2K
KamLANDKASKAXMASS
Precision measurements of m232, 23, m12
2, (12)
How can we discriminate positive and negative m2 ?
Real m2 = positive assumed
(No resonance for anti-neutrinos)
Real m2 = negative assumed
(No resonance for neutrinos)E(GeV)
cos
P(e)
E(GeV)
cos
P(e)
How can we discriminate neutrino and anti-
neutrino interactions ?
Simple answer: No. It is not possible to discriminate event by event in water Cherenkov experiments.
However, (total) and d/dy are different.
Try to discriminate positive and negative m2 using these events.
CC e
CC e
CC e
CC e
Others Others
Single-ring e-like Multi-ring e-like
Electron appearance for positive and negative m2
Single-ring e-like Multi-ring e-like
Positive m2
Negative Dm2
null oscillation
cos cos
Relatively high anti-e fraction
Lower anti-e fraction
m2=0.002eV2
s223 = 0.5 s213 = 0.05(SK 20yrs)
2 difference (inverted-normal)
m2: fixed, 23: free, 13: free
Exposure: 1.8Mtonyr (SK 80yr or HK ~ 3.3 yr)
3 3 3
True= normal mass hierarchy assumed.
2 difference (normal – inverted)
m2: fixed, 23: free, 13: free
Exposure: 1.8Mtonyr (SK 80yr or HK ~ 3.3 yr)
3 3 3
True= inverted mass hierarchy assumed.
We are here.
Super-KK2KT2K
90% CL Upper Limit of 13
J-PARC
T2K Phase I
Road Map of Neutrino Physics in Japan
J-PARC IntensityUpgrade
Measurement of 13
Hyper-K
T2K Phase II
Neutrino CP
Violation(If >20
deg,Sin2213>0.0
1)
FFAG R&D
Neutrino factory
If 13 is small (0.006 < sin2213 < 0.02)
Road Map of Neutrino Physics in Japan
We are here.
Super-KK2KT2K
13≠0 cannot be
established
J-PARC
T2K Phase I
J-PARC IntensityUpgrade?
Hyper-K?
T2K Phase II?
FFAG R&D
Neutrino factory
If 13 is too small (sin2213 < 0.006)
Road Map of Neutrino Physics in JapanSummary (Most Optimistic Case)
2004200520062007200820092010201120122013201420152016201720182019202020212022202320242025
K2K Super-K / Hyper-K T2K J-PARC 50 GeV FFAG R&D
finished Full reconstruction construction construction completed completed low intensity
full intensity
Phase I
construction Phase 1.5
(CP)-
Phase IICP
Intensityupgrade
P decayAtmospheric
PRISM-I@J-PARC
PRISM-II@J-PARC
NeutrinoFactory ?