Post on 06-Jan-2018
description
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 ?