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θ13発見後のT2K実験
A.K.Ichikawa, Kyoto university
for the T2K collaboration
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The T2K Collaboration
CanadaTRIUMFU. AlbertaU. B. ColumbiaU. ReginaU. TorontoU. VictoriaU. WinnipegYork U.
FranceCEA SaclayIPN LyonLLR E. Poly.LPNHE Paris
GermanyAachen U.
~500 members, 56 Institutes, 11 countriesItalyINFN, U. BariINFN, U. NapoliINFN, U. PadovaINFN, U. Roma
JapanICRR KamiokaICRR RCCNKEKKobe U.Kyoto U.Miyagi U. Edu.Osaka City U.U. Tokyo
PolandIFJ PAN, CracowNCBJ, WarsawU. Silesia, KatowiceU. WarsawWarsaw U. T.Wroklaw U.
RussiaINR
U. SheffieldU. Warwick
USABoston U.Colorado S. U.Duke U.Louisiana S. U.Stony Brook U.U. C. IrvineU. ColoradoU. PittsburghU. RochesterU. Washington
SpainIFAE, BarcelonaIFIC, Valencia
SwitzerlandETH ZurichU. BernU. Geneva
United KingdomImperial C. LondonLancaster U.Oxford U.Queen Mary U. L.STFC/DaresburySTFC/RALU. Liverpool
2
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Tokai-to-Kamioka (T2K) experiment
e
Simulated event display
ELmP e /27.1sin2sinsin 231
213
223
2
ELmP x /27.1sin2sincos1 232
223
213
4
~0.6 GeV over 295km
信号
e appearance → 13
– e-like ring, 0 mass cut etc.
disappearance → 23
– -like ring etc.
Precise prediction based on measurement
p+C interaction by CERN NA61
ND280 measurement
-flux x x-sec
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Data taking history
Jan2010
RUN1
RUN2
Great East Japan Earthquake (Mar. 11, 2011)
RUN3 RUN4
1.8% of T2K full stat.
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1.8% of T2K full stat.
Referred to > 550 times
6 events!!! over 1.5±0.3(sys) bkgs
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Data taking history
Jan2010
RUN1
RUN2
Great East Japan Earthquake (Mar. 11, 2011)
RUN3 RUN4
3.9% of T2K full stat.
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e appearanceNormal Hierarchy case
Inverted Hierarchy case
Result w/ Run1-3 (11events) was released at ICHEP2012 in August: 3.2
Aiming to achieve ~5significance w/ data up to Summer 2013. (x2.6)
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disappearance
9
best fitted spectrumnon oscill. spectrum
● Run 1-3 data
best fitted spectrum● Run 1-3 data
Recently updated w/ Run1-3 data (3.01x1020POT)
Update since July 2011(=1.4x1020POT)
Use event rate and Erec spectrum (Same as before)
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w/ 3.9% of T2K goal stat.
Best fitsin2223=1.0m2
32=2.45x10-3eV2
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Systematic Errors
e sample sample
Flux & X-section 5.0% (22.6%) 4.1%(21.8%)Flux 8.1%(11.9%) 7.1%(10.5%)
X-section (19%) (~19%)
X-sec (non-cancel w/ ND280) 7.5% 6.2%
SK detector 3.0% 10.5%Final-State and Secondary interactions
2.3% 3.5%
total 9.9%(24.2%) 13.2%(25.0%)
() is the case w/o ND280 constraint
Error on #event
w/ Run 1-3 data, both e appearance and disappearance measurements are still statistical limited.However, disappearance is starting to be affected by sys. error effect
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Precise measurement of sin2213 by reactor boosts the T2K sensitivity on CP-and octant degeneracy(*).
θ12 = 33.6°±1.0°
θ23 = 45°±6°(90%CL)
θ13 = 9.1°±0.6°
mass hierarchy: unknown
31322
132
232
132
13
212
13231223122
132
232
122
232
122
132
12
21313223131223122
13
21313223131223122313122
13
2132
3131
2223
213
213
sincos4
)21(8
sin)cos2(4
sinsinsinsin8
sinsincos)cos(8
2121sin4)(
EaLSSSC
SSSCCSSSCCCS
SSSCCC
SSSCCSSSC
SmaSSCP e
Max. 27% asymmetry by CP phase for 23=45
Leading including matter effect
CP conserving
CP violating
Matter effect
Solar
* disapp. is measuring sin2223 and cannot resolve <45 or >45.
39% for 23=39
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1 in vacuumP(e)
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
Lucky SpotsLarge Chance to find CP violation and to resolve MH.
P(e)
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
T2K (rough) full stat. error+/-1
Normal Hierarchy
Inverted Hierarchy
P(e)
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
CP allowed region
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
CP allowed region
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
CP allowed region
Dotted : NOvA(US, 810km)
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
CP allowed region
Dotted : NOvA(US, 810km)
NOvA Allowed region
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to e oscillation probabilityat oscillation maximum
sin2213=0.1, sin2223=1, w/ matter effect
Normal Hierarchy
Inverted Hierarchy
P(e)
T2K (rough) full stat. error+/-1
CP allowed region
Dotted : NOvA
NOvA Allowed region
T2K+NOvA allowed region
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Actually, w/ 23 uncertainty
Normal Hierarchy
Inverted Hierarchy
P(e)
Uncertainty by 23(current 1
23 measurement is also(or more) important.
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31322
132
232
132
13
212
13231223122
132
232
122
232
122
132
12
21313223131223122
13
21313223131223122313122
13
2132
3131
2223
213
213
sincos4
)21(8
sin)cos2(4
sinsinsinsin8
sinsincos)cos(8
2121sin4)(
EaLSSSC
SSSCCSSSCCCS
SSSCCC
SSSCCSSSC
SmaSSCP e
Max. 27% asymmetry by CP phase for 23=45
Leading including matter effect
CP conserving
CP violating
Matter effect
Solar
39% for 23=39
sin*29.0
sin21(21
sin2
)()()()(
23
23
2132
31
21
13
1212
23
23
SC
SmaS
SCSC
PPPP
ee
ee
,2.8g/cm assuming IH)for - and NHfor ( 1676.0)(
212
)()()(
3
22132
31
2
KTNOvA
matternoe
KTe
NOvAe
aaSm
PPP
T2K-NOvA asymmetry
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T2K [email protected] POT(750kW x 5e7sec @ 30GeV)
Combined 3 Flavor Appearance and Disappearance Fit
w/ and w/o reactor results
– sin2213=0.10.005: marginalize by error(=reactor sys. error)
w/ and w/o current systematic error
– Assume same error for anti- mode. +10% overall normalization error.
-mode:anti- mode running ratio =50%:50% for case study
(以下は、主に、Megan Friend(KEK), 池田一得(京大)とCSUの若者の仕事)
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Reconstructed Energy Spectrae appearance sample disappearance sample
anti mode
=0, sin2223=1m2=2.4x10-7 eV2
:anti-=50%:50% case mode 106 signal events, 39 bkg. eventsanti- mode 24 signal events, 22 bkg events (5.6 from e)
mode
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T2K full sensitivityExpected 90% C.L. allowed region
Allowed region assuming NH or IHSolid : w/o systematic errorDashed : w/ current systematic error
CP=-90, sin2223=1.0 Normal Hierarchy
Running fraction
mode:anti- mode = 100%:0% 50%:50%
w/ reactor results
CP measurement!!!
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# signal events # bkg events
mode 74 27
anti- mode 25 13
Combination w/NOvA
Baseline length 810 km (c.f. T2K 295km)
Detector Mass 15kT
3.6x1021 POT in 6 years
(Start in May 2013 w/ partial detector)
GLoBES (General Long Baseline Experiment Simulator) is used
c.f. T2K (:anti-=50%:50% case) mode 106 signal events, 39 bkg. eventsanti- mode 24 signal events, 22 bkg events (5.6 from e)
MINOS (2005- 2012) 735kmNOvA (2013-) 819km
(NH case)
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Regions where T2K&NOvA has >90% sensitivityRunning fraction mode:anti- mode = 50%:50%
NH casew/ reactor resultsw/o sys. errors
Red: T2KBlue: NOvABlack: T2K+NOvA
CP violation Mass Hierarchy discrimination
T2K sensitive region
IHだと左右反転
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Regions where T2K&NOvA has >90% sensitivityRunning fraction mode:anti- mode = 50%:50%
NH casew/ reactor resultsw/o sys. errors
Red: T2KBlue: NOvABlack: T2K+NOvA
CP violation Mass Hierarchy discrimination
NOvA sensitive region
IHだと左右反転
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Regions where T2K&NOvA has >90% sensitivityRunning fraction mode:anti- mode = 50%:50%
NH casew/ reactor resultsw/o sys. errors
Red: T2KBlue: NOvABlack: T2K+NOvA
CP violation Mass Hierarchy discrimination
T2K+NOvA sensitive region
IHだと左右反転
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Precision(1)
sin2213
=0degMH is assumed to be known(NH). mode: anti- mode=50%:50%
sin22e
Precision on P(e)Effective 2 flavor mixing angle for P(e)(obtained by fixing other oscillation parameters than 13)
Due to the uncertainty of , 23 and m2
32, precision is worse than sin22e
Full statFull stat
w/o sys. err
w/ present sys. err
Cf. Reactor sys. Error ~0.005
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Precision(1)
sin223
Full stat
=0degMH is assumed to be known(NH) mode: anti- mode=50%:50%w/ reactor result
w/o sys. err
w/ present sys. err
stat.only
90%
90%
3
3
Current 90% Allowed region
Inside this band,not resolved.
stat. only
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0
1E+21
2E+21
3E+21
4E+21
5E+21
6E+21
7E+21
8E+21
9E+21
1E+22
Guesstimate on accumulated protons on targetand T2K milestones for coming years
LINAC Energy upgrade 400MeV MR rep. rate upgrade 1.28 sec cycle
Full stat.
5 for e appearance
No sys. err
90% for 23 octant
90% for CPv
2 for CPv
Starting point corresponds to sin223=0.39 (current 90% C.L. limit)
90% for non-max. 23
3 for non-max. 23
あまり科学的な図では、ありません。お楽しみということで。
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J-PARC power upgrade plan
Ion source & RFQ upgrade
30mA →50mA
LINAC 180MeV→400MeV
FY13 summer 6months shutdown
Rep. rate 2.48s →1.28sReplace all magnet power supplyRF accelerating power upgrade
Upgrade of related pulse operation devices (inj./ext. kicker/septum etc)
Achieve 750kW at ~2017
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)sin,cos(
10000
0010
0
00
001U 1212
1212
1313
1313
2323
2323PMNS
ijijijij
i
i
sc
cssc
ces
esc
cssc
研究の目的
! 0.6 1.9)CL%90( 645
0.16.33
13
23
12
~7.6x10-
5eV2
~7.6x10-
5eV2
~2.4x10-3eV2
~2.4x10-3eV2
Normal
OR
Mass Hierarchy
Inverted
Big Impact on 0 double- decay search(hence on Majorana confirmation)
Reactor experiments
CP phaseKEY to understand the origin of matter dominant universe Mixing matrix for
leptons
![Page 38: A.K.Ichikawa, Kyoto university for the T2K collaborationhep.phys.s.u-tokyo.ac.jp/NuFrontier/Presen/Ichikawa.pdf · Tokai-to-Kamioka (T2K) experiment e Simulated event display P e](https://reader034.vdocuments.net/reader034/viewer/2022043016/5f393be69185af6ab60d1ee2/html5/thumbnails/38.jpg)
研究計画
加速器とニュートリノビームの強度向上(定常値! 500 kW、最高値750 kW相当)、
(2) ニュートリノビームフラックスの高精度測定(3 %)
(3) 複数のニュートリノ反応モードの断面積測定によるニュートリノ原子核反応の基準模型構築
(4) 系統誤差改善(5 %) によるニュートリノ振動解析の高度化
(5) 反ニュートリノビームを用いた反ニュートリノ振動の測定
T2K、まだまだ続きます。