T2K experiment at J-PARC Epiphany 2010 D. Kiełczewska 1 For T2K Collaboration Danuta Kiełczewska Warsaw University & Sołtan Institute for Nuclear Studies Neutrino oscillations what remains to be measured experimental approach T2K goals, design & construction Current status Epiphany 2010, Kraków
T2K experiment at J-PARC. Neutrino oscillations what remains to be measured experimental approach T2K goals, design & construction Current status. For T2K Collaboration Danuta Kiełczewska Warsaw University & Sołtan Institute for Nuclear Studies. Epiphany 2010, Kraków. ν μ. - PowerPoint PPT Presentation
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T2K experiment at J-PARC
Epiphany 2010 D. Kiełczewska 1
For T2K CollaborationDanuta KiełczewskaWarsaw University& Sołtan Institute for Nuclear Studies
Neutrino oscillations what remains to be measured experimental approach
T2K goals, design & construction Current status
Epiphany 2010, Kraków
What we know and don’t know about neutrino masses
D. Kiełczewska
log m2
νe νμ ντ
10-2 eV
10-1 eV
1 eVlog m
Epiphany 2010
Δm223 <0Δm2
23 >0
2
|Δm223|=2.4 x 10-3 eV2
Δm212 = 7.6 x 10-5
eV2
40 meV < mii=1
3
∑ < 2 eV
What is the hierarchy?
What do we know about mixing?
1 2 1 2
1 2 1 2 3 2 3
2 3
1 3 1 3
1 1
2
2 3 3 3
0
0 1 0
0
0
0
0
1 0 0
0 0
0 0
1 0 0
00 1
0
i
i
i i
c s e
s e c
c s
s c
c s
cU s e
e
cos
sini j i j
i j i j
c
s
2 o o23sin 2 1.02 0.04 (37 -53 ) - is it maximal? which octant?
sin2 212 =0.86 +0.03 (12 =34o)2 o
13 13sin 2 0.14 at 90% c.l. ( 10 )
We need to measure: <- more precisely
solar atmospheric 0νββ
D. Kiełczewska
23
13
Epiphany 2010 3
Global analysisGlobal
analysis
on the basis of the data at Nu2008T. Schwetz et al. arXiv:0808.2016
213sin 2 0.04 <0.15
D. KiełczewskaEpiphany 20104
SNO: arXiv:0910.2984
sin213 =0.020−0.016+0.021
sin213 < 0.057 (95% c.l)
What is expected ?
63 models, arXiv:hep-ph/0608137
We would better measure it!
D. KiełczewskaEpiphany 2010
5
How to measure
sin213 < 0.04
We need:
an experiment with L/E corresponding to
transition to/from good precision (a few %)
2atmm
or e eν ν
eμν ν
13
Reactor e eν ν disappearance
Accelerator appearance
Pvac (νμ → νe) =sin2 213 ⋅sin2 23 ⋅sin
2 1.27m132 ⋅L
E
+ f (CP ,sgn(m132 ))
D. Kiełczewska
Δm2atm
Δm2solar
P(νe→ νe) ≈1−sin2 213 ⋅sin
2 1.27m132 ⋅L
E
13
13
mass hierarchy
CP violation
νe νμ ντ
Epiphany 20106
D. KiełczewskaEpiphany 2010 7
Accelerator experiments of second generation
• Powerful neutrino sources • „off axis” beams
T2K Novasite Japan USAbeam since 1/04/2009 NuMi (upgraded)Eν (peak) 0.76 GeV 2.22 GeVdistance 295 km 812 kmFar detector Super-Kamiokande to be builtof mass (FV) 22.5 ktons 14 ktonsStatus Starts taking data Excavations started
D. Kiełczewska
Owing to higher energy and larger distance, NOvA will be more sensitive to matter effects (mass hierarchy).
Combining the NOvA and T2K results will facilitate the separation of CP from matter effects.
Epiphany 20108
T2K experiment(Tokai to Kamioka)
Epiphany 2010 D. Kiełczewska 9
T2K Collaboration
Epiphany 2010 D. Kiełczewska 10
SINS WarsawNINP KrakowWarsaw Technical U
508
T2K Off Axis BeamQuasi monochromatic beam
295 km
Neutrino energy
2 2
0.43
1
EE ν
Kinematics of decay
D. Kiełczewska
Tunable neutrino energy to oscillataion maximum Reduced tail at high ν energies helps to reduce background due to production
Epiphany 2010
0
11
J-PARC accelerator laboratory in Tokai
Epiphany 2010 D. Kiełczewska 12
Upstream of Linac Tunnel
NeutrinoTunnel
50 GeV Tunnel
From 3 GeV toMaterials and Life
Middle of Linac Tunnel
From Linacto 3 GeV
3 GeVExtraction Point
TunnelTour
JPARCJPARC
D. KiełczewskaEpiphany 2010 13
D. KiełczewskaEpiphany 2010 14
Near detector ND280
(including all 3 horns)
Beam commissioning
(Apr- May 2009)
Epiphany 2010 D. Kiełczewska 15
Protons extracted from MR with superconducting magnets.
Proton beam tuned within 3mm to the designed orbit
Muon monitor
Epiphany 2010 D. Kiełczewska 16
Array of Si photodiodesand ionization chambers
Focusing effect of a horn with 273 kA
For precision measurements
Epiphany 2010 D. Kiełczewska 17
We need:
precise beam determination in particular we need to know Far/Near ratio with an accuracy of 2-3%NA61 /SHINE experiment
talk by Magda Posiadała
cross –section measurements νe component in the νμ beam
near detectors
Near Detector ND280
Epiphany 2010 D. Kiełczewska 18
ND280 off-axis detector
Epiphany 2010 D. Kiełczewska 19
UA1 magnet 0.2 Tinner volume 3.5x3.6x7 m3
P0D – optimized for NC π0 production scintil. bars covered with lead & water layers