t2kk および t2ko 実験での質量階層性、cp位相測定の可能性
TRANSCRIPT
T2KK および T2KO 実験での質量階層性、CP位相測定の可能性
Yoshitaro Takaesu U of Tokyo
In collabora0on with K. Hagiwara, N. Okamura, P. Ko (work in progress)
t 2.06.29 AM
t 2.06.29 AM
Mass Hierarchy Dirac CP Phase
Several ways to determine them Long Base Line
LBNE
Nova
Fermi Lab
T2K
J-‐PARC
LBNO
CERN
Atmospheric
ICECUBE
SK
HK INO
Experiments for MH and CP phase
Reactor (MH) JUNO (CHINA) RENO-‐50 (KOREA)
T2KK: 100 kton in Korea [hep-‐ph/0410229, 0504026, 0901.1517, 1001.5165] T2KO: 100 kton in Oki Island [0804.2111, 1209.2763] * SK (22.5kton) will be used as a near detector
3
SK
T2KO (650 km) T2KK
(1000 km)
T2K (250 km)
100 100
22
Oki
T2KK and T2KO proposals
Analysis method �2analysis
• SystemaWcs • maXer density: 6% • Cross secWon, normalizaWon: 3% • fiducial volume: 3% • NC pi0 BG modeling (T2K result)
• Parameters �m2
12 = (7.5± 0.2)� 10�5eV2
�m213 = ±2.35� 10�3eV2
• Backgrounds • Secondary beam: • miss-‐ID neutrino • pi0 BG with improved rejecWon (POLFIT) SK
T2KO
T2KK
�e, �̄e, �̄µ(�µ)
�CP
sin2 2�12 = 0.857± 0.024sin2 2�13 = 0.095± 0.005sin2 �23 = 0.5± 0.1
・Signal: �µ � �e, �µ �̄µ � �̄e, �̄µ*Improvements from 0901.1517 1209.2763
Expected energy distribu0ons
Total events CCQE signal CCRES signal NCpi0 BG (uncertainty) miss-‐ID neutrino BG
SK
T2KO
T2KK �
�̄
�
�
�̄
�̄
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
NH, sin2θ23 = 0.5
ν : ν− = 5 : 0
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
NH, sin2θ23 = 0.54 : 1
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
NH, sin2θ23 = 0.53 : 2
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
NH, sin2θ23 = 0.5
2.5 : 2.5
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
IH, sin2θ23 = 0.5
ν : ν− = 5 : 0
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
IH, sin2θ23 = 0.54 : 1
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
IH, sin2θ23 = 0.53 : 2
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (3.0°, 0.5°)
IH, sin2θ23 = 0.5
2.5 : 2.5
MH sensi0vity with and beam (T2KK) � �̄The sensiWvity is enhanced by including anW-‐neutrino focusing beam.
3:2 ~ 1:1 neutrino anW-‐neutrino beam raWo is best. MH can be determined with 3 – 5 sigma CL in 5 years.
T2KK NH T2KK IH
MH sensi0vity with and beam (T2KO)
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Oki) = (2.5°, 0.9°)
NH, sin2θ23 = 0.5
ν : ν− = 5 : 0
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Oki) = (2.5°, 0.9°)
NH, sin2θ23 = 0.54 : 1
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Oki) = (2.5°, 0.9°)
NH, sin2θ23 = 0.53 : 2
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Oki) = (2.5°, 0.9°)
NH, sin2θ23 = 0.5
2.5 : 2.5
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (2.5°, 0.9°)
IH, sin2θ23 = 0.5
ν : ν− = 5 : 0
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (2.5°, 0.9°)
IH, sin2θ23 = 0.54 : 1
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (2.5°, 0.9°)
IH, sin2θ23 = 0.53 : 2
0
5
10
15
20
25
30
35
40
-180 -90 0 90 180
∆χ2
δCP
OAB(SK, Kr) = (2.5°, 0.9°)
IH, sin2θ23 = 0.5
2.5 : 2.5
� �̄The sensiWvity is enhanced by including anW-‐neutrino focusing beam.
3:2 ~ 1:1 neutrino anW-‐neutrino beam raWo is best. MH can be determined with 2 – 4 sigma CL in 5 years.
T2KO NH T2KO IH
0
10
20
30
40
50
60
-180 -90 0 90 180
Unc
erta
inty
of δ
CP
true δCP
OAB(SK, Kr) = (3.0°, 0.5°), NH (true-MH fit)ν : ν− = 5 : 0
4 : 13 : 2
2.5 : 2.5
0
10
20
30
40
50
60
-180 -90 0 90 180
Unc
erta
inty
of δ
CP
true δCP
OAB(SK, Kr) = (3.0°, 0.5°), IH (true-MH fit)ν : ν− = 5 : 0
4 : 13 : 2
2.5 : 2.5
CP measurement with and beam � �̄UWlizing anW-‐nu beam also improves the CP phase measurements.
0
10
20
30
40
50
60
-180 -90 0 90 180
Unc
erta
inty
of δ
CP
true δCP
OAB(SK, Oki) = (2.5°, 0.9°), NH (true-MH fit)ν : ν− = 5 : 0
4 : 13 : 2
2.5 : 2.5
0
10
20
30
40
50
60
-180 -90 0 90 180
Unc
erta
inty
of δ
CP
true δCP
OAB(SK, Oki) = (2.5°, 0.9°), IH (true-MH fit)ν : ν− = 5 : 0
4 : 13 : 2
2.5 : 2.5
T2KK NH T2KK IH
T2KO NH T2KO IH
Summary We revisited the sensiWvity of T2KK and T2KO proposals to neutrino mass hierarchy and Dirac CP phase with
realisWc pi0 background esWmaWon anW-‐nu beam opWon
Dirac CP phase The sensiWvity is slightly improved.
If MH is determined, T2KK measures with > +-‐ 20° accuracy. T2KO measures with > +-‐ 20° accuracy.
MH The sensiWvity is significantly improved by including
anW-‐nu beam opWon. Especially for CP phase ~ -‐90 deg. (NH) and ~90 deg. (IH).
T2KK has sensiWvity (3° OAB, ). T2KO has sensiWvity (2 ~ 3° OAB, ).
3 � 5� sin2 �23 = 0.5sin2 �23 = 0.52 � 4�
�CP
�CP
オープンイノベーションの地域性の研究albatross.soc.shimane-u.ac.jp/src/kiyo/kiyobase/zzz006/...【論 文】 オープンイノベーションの地域性の研究
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