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(1)

T2KK

T2KK

の物理的可能性

の物理的可能性

an extension of the

an extension of the

T2K

T2K

neutrino oscillation

neutrino oscillation

experiment with a far detector in Korea

experiment with a far detector in Korea

岡村直利

岡村直利

(

(

京大・基研

京大・基研

)

)

関西セミナーハウス(

関西セミナーハウス(

2007/03/17

2007/03/17

based on hep-ph/0504061 [Phys.Lett.B637,266 (2006)] hep-ph/0607255 hep-ph/0611058 with 萩原薫,泉田賢一(KEK,総研大)

(2)

2/23

T2KK

T2KK

の注目度

の注目度

„ „

2005年11月18日、19日

2005年11月18日、19日

„ „ KIASKIAS(韓国)(韓国) „ „ http://newton.kias.re.kr/~hepph/J2Khttp://newton.kias.re.kr/~hepph/J2K „ „

2006年07月13日、14日

2006年07月13日、14日

„ „ SNUSNU(韓国)(韓国) „ „ http://t2kk.snu.ac.kr/http://t2kk.snu.ac.kr/ „ „

2007年

2007年

„ „ 日本(?)日本(?) „ „

実施されるかは不定

実施されるかは不定

„ „

多くの人が興味を持っている。

多くの人が興味を持っている。

(3)

目次

目次

„

„

Short Review

Short Review

„

„ 今日まで、そして、残された課題今日まで、そして、残された課題

„

„

T2KK

T2KK

„

„ JJ--PARC, SK, and KoreaPARC, SK, and Korea

„

„

最適地

最適地

„

„ 質量階層性質量階層性, CP phase, octant,, CP phase, octant,

„

(4)

Short Review

Short Review

(5)

Parameters (3gene.)

Parameters (3gene.)

„

„

neutrino masses

neutrino masses

„

„

m

m

11

m

m

2 2

m

m

33

„

„

flavor mixing angles

flavor mixing angles

„ „

θ

θ

12 12

θ

θ

23 23

θ

θ

1313 „ „

CP phase

CP phase

„ „

δ

δ

„

„

Majorana phases

Majorana phases

„ „

φ

φ

11

φ

φ

22

Neutrino Physics

Neutrino Physics

7/9 parameters

7/9 parameters

„

„

squared

squared

-

-

differences

differences

„

„

δ

δ

m

m

221212

δ

δ

m

m

221313

(

≡m

23

-m

21

)

„

„

flavor mixing angles

flavor mixing angles

„ „

θ

θ

12 12

θ

θ

23 23

θ

θ

1313 „ „

CP phase

CP phase

„ „

δ

δ

„

„

Majorana phases

Majorana phases

„ „

nothing

nothing

Neutrino Oscillation

Neutrino Oscillation

6 parameters

6 parameters

(6)

6/23

現状

現状

solar neutrino (SK,SNO), reactor (KamLAND) 物質効果の有効利用

full

100%

full

100%

(

45o

)

07 . 0 0.84 2 sin 12 12 2 < ± =

θ

θ

(

)

(

0

)

eV 10 6 . 0 3 . 8 2 12 2 5 2 12 > × ± = − m m

δ

δ

atmospheric neutrino (SK), long-baseline (K2K) 振動確率が偶関数

half

50%

half

50%

(

45o 5o

)

00 . 1 96 . 0 2 sin 23 23 2 ± = − = θ θ

(

)

(

絶対値だけ

)

2 3 2 13 2.5 0.5 10 eV − × ± = m δ

reactor neutrino exp.(CHOOZ) 将来的に測定されるだろう。

non

0%

non

0%

(

上限値だけ

)

16 . 0 2 sin2

θ

13 < ) ( MNS 未知量

δ

(7)

もしも

もしも

inverted

inverted

なら

なら

„

量子補正が無視できない

„

Effective mass of 0

ν

2

β

decay

3 2 2 3 3 2 2 2 2 1 1 ϕ ϕ i e i e e ee

m

U

m

U

e

m

U

e

m

=

+

+

− 2 ϕ 2π π 0 sin 2 2 θ 12 @10 13 GeV m3 = 0.0, sin22θ 12=1.0 @ MZ [GeV] inverted hierarchy and large tanβ

ϕ2=π : large mixing angle は量子補正 で変化しない。

ϕ2=0 : large mixing angle は量子補正 で変化する。

[hep-ph/0005075]

inverted hierarchy + large tan

β

+

ϕ

2

~0.0

(8)

T2KK

T2KK

T2K

T2K

実験

実験

+

+

large detector in

large detector in

韓国

韓国

(9)

基本戦略(定性的)

基本戦略(定性的)

(

)

(

)

(

m E

)

L q B A q P ij ij e e e 2 , 1 sin 2 2 sin 1 sin ) 1 ( 2 2 atm 2 13 2 rct 2

δ

θ

θ

ν

ν

μ ≡ Δ − ≡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ Δ + + + = → π δ θ θ δ θ θ θ π δ θ π δ θ θ θ 13 MNS 2 1 rct 2 sun 2 MNS rct sun 12 rct 13 MNS 2 1 rct 2 13 MNS rct sun 12 rct 2 13 015 . 0 cos 2 sin 10 . 0 1 1 15 . 0 km 1000 29 . 0 sin cos 1 1 sin 2 2 sin 2 2 cos 4 sin 2 sin 10 . 0 1 1 29 . 0 km 1000 37 . 0 2 2 sin 1 1 sin 2 sin 2 2 cos Δ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + − + − ≈ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + − Δ + − = Δ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + − − Δ ≈ = + − Δ − Δ = q q L q q E aL B q q L En G a q q E aL A e e F e

“matter effect” Ù“base-line length”

hep-ph/0602115

~1st maximum

(10)

10/23

T2K

T2K

のビームは韓国へ

のビームは韓国へ

Off-Axis-Beam (OAB) : 円錐状に広がる

3.0@SK

S-Korea

Super-K

J-PARC

hep-ph/0607255

L=1000-1200km,

θ

=1.0

°-4.0°

L=295km,

θ

=2.0

°-3.0°

on-axis

(11)

条件

条件

„

fiducial volume (100% efficiency)

„ SK : 22.5 kton Korea : 100 kton

„

露出時間

„ 5年(1021 POT/year ,0.8MW), T2K-I running time „ anti-neutrino は使わない

„

基線長と角度

„ SK: L=295km with

θ

=2.5o or 3.0o

„ KR: L=1000-1200 km with

θ

=(0.5o ~ 3.0o) / 0.5o step

(12)

12/23

Event Number

Event Number

„

CCQE event

„ easy reconstruct the neutrino energy „ easy distinguish, e-like,

μ

-like

„

ビン切り

„ ビン幅: 200MeV (Fermi motion 80MeV) „ 領域 (#event > 10)

„ 0.4 - 5.0 GeV for μ-like (SK/Korea) „ 0.4 - 1.2 GeV for e-like (SK)

„ 0.4 - 2.8 GeV for e-like (Korea)

„

バックグラウンド

„ beam contaminationsは含む (another flavor in beam) „ NC backgroundは含まない (π0!γγ Ù e-shower)

(13)

入力値

入力値

„

太陽

„ sin22

θ

= 0.83± 0.07,

δ

m2 = (8.2 ± 0.6) ×10-5 eV2 „

大気

„ sin22

θ

= 1.00Ù0.96,

δ

m2 = 2.5 ×10-3 eV2 „

物質密度 (不定性: ±3%)

„

ρ

= 2.8 / 3.0 (g/cm3) (SK/Korea) „

その他(systematic)(不定性: ±3%)

„ flux normalization (each species) „ CCQE cross section (

ν

/ anti-

ν

)

„ fiducial volume (SK / Korea)

(14)

14/23

χ

χ

2

2

-

-

rule of the game

rule of the game

-

-( ) -( )

( )

(

)

( )

( )

(

)

(

) (

)

input 2 rct 2 fit rct 2 2 fit sun 2 2 2 5 2 5 fit 2 1 2 2 Kr SK, 2 SK/Kr 2 flavor all , 2 2 : bin : 2 input input fit 2 01 . 0 2 sin 2 sin 07 . 0 83 . 0 2 sin eV 10 6 . 0 eV 10 2 . 8 03 . 0 0 . 1 03 . 0 0 . 1 03 . 0 0 . 1 03 . 0 0 . 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ × × − − + ⎪⎭ ⎪ ⎬ ⎫ ⎪⎩ ⎪ ⎨ ⎧ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + ⎟⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎝ ⎛ = − −

θ θ θ χ ρ ν ν ν ν α α α α β m m f f f f N N N V QE flux e,μ i i i i α

event number

sys. error

parameter error

原子炉実験

Double CHOOZ

問題を解くのに重要

(15)
(16)

16/23

質量階層性

質量階層性

true : sin22

θ

13 = 0.1 Ù free : fit

δ

= 0.0 Ù free

true

true

:

:

normal

normal

fit

fit

:

:

inverted

inverted

最適地: L=1000km with 0.5

o

and 3.0

o

@SK

(17)

L

= 1000 km and

θ

= 0.5

o

SK :

θ

= 3.0

o

Seoul

(KIAS)

大田

(KAIST)

hep-ph/0504061

大邱

(LP07)

浦項

(APCTP)

(18)

18/23

理由

理由

flux

σ

flux

σ

(19)

19/23

CP

CP

位相(

位相(

normal hierarchy

normal hierarchy

(20)

20/23

CP

CP

位相(

位相(

inverted hierarchy

inverted hierarchy

(21)

octant

octant

input : θ<45o fit : θ>45o input : θ>45o fit : θ<45o

nor

inv 0.96

(22)

22/23

まとめ

まとめ

„

T2KK

„

T2K+ Large Detector (100kton) in Korea

„

物質効果の大きさ(距離に比例)の違いが決め手

質量階層性、CP位相、octant

„

T2KK + 原子炉実験(Double CHOOZ)

„

質量階層性

(3

σ

: sin

2

2

θ

13

~ 0.05)

„

CP位相

(±30

o

: without anti-neutrino)

„

Octant(0.40Ù0.60) (3

σ

: sin

2

2

θ

13

~ 0.12)

(23)

thank you for your attention

thank you for your attention

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