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!KEK
1 2011/8/9 @J-PARC
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!" !!" (T2K) !!" Post-T2K” !"" !"" !"" !"" !
!" !!" !! 2011/8/9 @J-PARC 2
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!" !"" !""Matter effect !
!"""Mass hierarchy!"" !
!"Majorana or Dirac: (0!"" )!!"CP !
"" !"" !
!" - !"" !, anti-! CP !
2011/8/9 @J-PARC 3
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!" Probe:!"" !
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Mass eigenstates
6 independent parameters govern oscillation!!12, !!23, !!13, ""
#m122, #m23
2, #m132 )sin(s ),cos(c ijijijij !! ==
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Pontecorvo-Maki-Nakagawa-Sakata Matrix (CKM matrix in lepton sector)
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!µ # !e appearance!" : (L/E!) !!"CP ! / anti-! #
( $ $# -$, a$#-a)!!" :!
"" L #m231 #
… Mass Hierarchy
2011/8/9 @J-PARC 5
CPVSol term
!!e??
or
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!" !
"" %12, %23, #m212,|#m2
23| !"" %13 :T2K, MINOS !•" !•"NO!A: 2013~!
"" !µ#!& appearance : OPERA,ICURUS!""
!•" LSND, MiniBooNE:!
%" #m2 ~ O(0.1~ 10eV2) anti-!µ#anti-!e = ! !# “Sterile neutrino” !•" MINOS: !µ disappearance: #m2 !µ anti-!µ ?!
%" CPT !
2011/8/9 @J-PARC 6
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T2K!"$10/1~%11/3 1.4&1020POT !
""~70[kW&107s] !""6 !µ#!e (BG1.5±0.3 # sig=4.5)!
!" Milestone ~1[MWx107s]H26!"" NO!A H25 700kW !
2011/8/9 @J-PARC 7
110622
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“Post-T2K”!" !
"" !""Matter effect!
!" !""Mass hierarchy!"" !
!"Majorana or Dirac: 0!"" !
!"CP !"" !
!!" - !!
1.66MW KEK roadmap !!
2011/8/9 @J-PARC 8
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Quest for the Origin of Matter Dominated Universe
One of the Main Subject of the KEK Roadmap
Discovery of Lepton CP Violation
Proton Decay
Discovery of the !e Appearance
Neutrino Intensity Improvement
Huge Detector R&D
T2K (2009~)
Water Cherenkov v
Liquid Ar TPC
Establish Huge Detector
Technology Construction of Huge Detector
MR 1.66MW
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!" !""Matter effect !""Oscillation Max.
Asymmetry @ sin22%13=0.1!•" sin$=1 ~20%!•" sin$=0.2 ~4%!
"" 3'!/anti-! ~1%
!"" 11000 !•" T2K: #
4.5 event / 70 kW 107s / 22.5kt!#"175MW 107s 22.5kt !
#" 2MW &1Mt &~4 &2 (!/anti-!)!2011/8/9 @J-PARC 10
Matter effect
CP term
Total
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CP!" :# ~2MW !"" “Super beam” !•" (J-PARC MR )!•"T2K %13 a few MW Super beam CP
!"" (R&D )!•" ( ) !
"" (R&D )!•" (µ # e !µ !e)!
%" p !•" # !
!" J-PARC ! !"" !
2011/8/9 @J-PARC 11
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!"#$%&' ( '
Bend the beam by ~80°° Using Super-conducting combined function Magnets
NC magnets Using MIC (Mineral-insulation-cable)
Beam profile monitor Beam position monitor
Secured operation is important for high intensity beam. Allowable beam loss: ~1W/m.
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Baffle
1st horn Target
OTR (Profile monitor)
2nd horn 3rd horn
BEAM
Iron shield (2.2m) Concrete Blocks
Helium Vessel
Decay Volume
110m
Beam dump
Muon Monitor
Target station
Beam window
!"#$%&' (( '
target
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!" DV 3MW OK!!" (>>1MW) !
"" !•" p/pulse ~5x1014ppp #
!•" !
"" !•" T2K !•" ~1Hz #
!"" !
•" ( )!•" SSEM( ) # )!
"" !"" !
•" …!!
2011/8/9 @J-PARC 14
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!"!µ # !e !"" !"" !
•" 1st oscillation max. 2nd oscillation Max. !!" !
"" (L) ## !•" x !
"" !•" Wide band or Narrow band? Or other !
# # # !
!" !"" !"" (Mass Hierarchy)!"" !/anti-! !
CP
A.Rubbia2300km
CPVMatter
295km
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CP Far Detector!" !"" !µ # !e : T2K !•" !•" !
!" ~50!"" # !
!" !"" 2 !•" (WC) … O (1Mt)!•" TPC (LAr) … O (100kt)!
2011/8/9 @J-PARC 16
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P32 proposal (Lar TPC R&D) Recommended by J-PARC PAC (Jan 2010), arXiv:0804.2111
J-PARC+HK @ L=295km OA=2.5deg
J-PARC+LAr @ L=658km OA=0.78deg
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Far detector technology!
Liq Ar TPC!!"Aim O(100kton)!!"Electronic bubble chamber !
""Can track every charged particle!""Down to very low energy!
!"Neutrino energy reconstruction by eg. total energy!""No need to assume process type!""Capable upto high energy!
!"Good PID w/ dE/dx, pi0 rejection!
Water Cherenkov!!"Aim O(1000kton)!!"Energy reconstruction
assuming Ccqe!""Effective < 1GeV!
!" Good PID (µ/e) at low energy!!"Cherenkov threshold!
Good at Wideband beam
Good at low E (<1GeV) narrow band beam
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J-PARC HK!" WC O (1Mt)!""Sub-GeVµ/e .!•" CC-QE 1-ring !
""NC (0 !e !•"T2K ~20% 5%!
""OA Narrow Band beam !!" !""
!
2011/8/9 @J-PARC 19
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J-PARC + LAr!" O(100kt)!
""Multi-track !•" Exclusive !•" e/(0 !
""!
!" !""T2K !
!" !"" e/(0 !"" !
•" !•" J'PARC T32 $ !•" ( ) ICURUS T600, ( )MicroBooNE $ !•" !
!2011/8/9 @J-PARC 20
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J-PARC ”Post T2K” !!" !
""MicroBooNE: 70t LAr Sterile neutrino search !""NO!A: 2013~ %13 measurement using 700kW beam.!""MINOS+ : 2013~: Sterile neutrino search w/ MINOS detector.!""LBNE : L=1300km WC or LAr : CP violation, MH!
•" FNAL-MI !!" :!
""ICURUS@CERN PS: LAr for sterile!""CN2PY(LAr), CN2Frejus(WC)!
•" CERN !!" Neutrino factory, Beta beam + MIND/TASD
!•" %13 Design Parameter !•" !
2011/8/9 @J-PARC 22
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!" T2K : CP “Super Beam” !!"Post-T2K !
"" CP !•" !•" !
"" ~2MW !""2 Far !•" !
%" !•" TPC!
%" !%"e/(0 !
•" !%" - !
2011/8/9 @J-PARC 23