T2K status in 2017
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This document summarizes the status of the T2K experiment in 2017. It discusses the neutrino beam and detector status, highlights of recent results including constraints on neutrino oscillation parameters and the first measurement of CP violation, and future plans to collect more data and upgrade detectors to improve sensitivity to CP violation. Over 22×1020 protons have been collected so far, with stable beam operation at 470 kW power. The Super-K detector continues to collect data efficiently, and analysis improvements have increased the neutrino event samples.
![J-PARC neutrino beam status (cont’d)
08/12/17 ICRR Annual Review 2017 4
² Stability of 𝜈 production rate monitored by T2K on-axis INGRID detector
² Stability of 𝜈 beam direction monitored by INGRID and MUMON
(1mrad shift corresponds to 2% shift in 𝜈 peak energy)
Day
[events/1e14POT]
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Event rate Horn250kA
Horn205kA
Horn-250kA
[mrad]
1−
0.5−
0
0.5
Horizontal beam direction INGRID
MUMON
Day
[mrad]
1−
0.5−
0
0.5
1
Vertical beam direction INGRID
MUMON
T2K Run1
Jan.2010-Jun.2010
T2K Run2
Nov.2010-Mar.2011
T2K Run3
Mar.2012-Jun.2012
T2K Run4
Oct.2012-May.2013
T2K Run5
May.2014
-Jun.2014
T2K Run6
Oct.2014-June.2015
T2K Run7
Feb.2016-May.2016
T2K Run8
Oct.2016-Apr.2017](https://image.slidesharecdn.com/20171208icrrannualreviewt2kshort-171209150054/85/T2K-status-in-2017-4-320.jpg)
![T2K far detector status
08/12/17 ICRR Annual Review 2017 5
² Super-K performs stably
² Data taking efficiency of 98.8% for T2K run8
Super-Kamiokande
(41.4 m tall x 39.3m diameter)
22.5 ktons fiducial volume
1000m underground
2.5
12/31
2008
12/31
2009
12/31
2010
12/31
2011
12/31
2012
12/31
2013
12/31
2014
12/31
2015
12/31
2016Event/day
0
2
4
6
8
10
12
attenuationlength[m]
date
using bottom PMT
60
65
70
75
80
85
90
95
100
105
110
01/01/09 01/01/10 01/01/11 01/01/12 01/01/13 01/01/14 01/01/15 01/01/16 01/01/17
Atmospheric 𝜈 FCFV events](https://image.slidesharecdn.com/20171208icrrannualreviewt2kshort-171209150054/85/T2K-status-in-2017-5-320.jpg)
![𝛿CP measurement
08/12/17 ICRR Annual Review 2017 10
(rad)CPδ
3− 2− 1− 0 1 2 3
ln(L)∆-2
0
5
10
15
20
25
30
Normal
Inverted
T2K Run1-8 PreliminaryFinal systematics pending
² 1𝝈 CL. confidence interval
Normal Hierarchy [-2.49, -1.23] rad.
² 2 𝝈 CL. confidence interval
Normal hierarchy [-2.91, -0.60] rad.
Inverted hierarchy [-1.54, -1.19] rad.
à CP conserving values (0, 𝜋) fall outside
of the 2𝝈 CL. confidence/credible interval
2𝝈 CL. intervals
(rad.)CPδ
3− 2− 1− 0 1 2 3
Posteriorprobabilitydensity
0
0.1
0.2
0.3
0.4
0.5
0.6 95.4% Credible Interval
90% Credible Interval
68% Credible Interval
T2K Run 1-8 preliminary
Frequentist
Bayesian
Reconstructed Energy (GeV)ν
0 0.2 0.4 0.6 0.8 1 1.2
NumberofEvents
4−
2−
0
2
4
6
8
10
12
14
16
T2K Run1-8 Preliminary
= 0CP
δ
Data](https://image.slidesharecdn.com/20171208icrrannualreviewt2kshort-171209150054/85/T2K-status-in-2017-10-320.jpg)
![Future plans
08/12/17 ICRR Annual Review 2017 11
Short-term
² Requested 9x1020 POT before summer
2018 (mainly in anti-neutrino mode)
² Super-K tank open from June 2018 to
repair the leak, install a new water pipe
and replace dead PMT
Long-term
² Upgrade MR power supplies to increase
beam power
² T2K-II
² Proposal to collect 20 x 1021 by JFY2026
² Neutrino beamline upgrade & analysis
improvement to effectively add 50% statistics
² ND280 upgrade is proposed and formally
approved by T2K
JFY
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
MRBeamPower[kW]
0
200
400
600
800
1000
1200
1400
POT]21
IntegratedDeliveredProtons[10
0
5
10
15
20
25
30
35
40
45
POT]21
.[10July)−(Oct.DeliveredProtons/Period
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
MR Power Supply upgrade
T2K-II Protons-On-Target Request
)°(CP
δTrue
200− 100− 0 100 200
=0CPδtoexcludesin2
χ∆
0
5
10
15
20
=0.4323θ2
True sin
=0.5023θ2
True sin
=0.6023θ2
True sin
POT w/ eff. stat. & sys. improvements21
20x10
POT w/ 2016 sys. errs.21
7.8x10
90% C.L.
99% C.L.
C.L.σ3](https://image.slidesharecdn.com/20171208icrrannualreviewt2kshort-171209150054/85/T2K-status-in-2017-11-320.jpg)
More Related Content
T2K status in 2017
- 1. S. Cao (IPNS, KEK) on behalf of T2K Collaboration 08/12/17 ICRR Annual Review 2017 T2K Status in 2017 ² The T2K experiment ² Neutrino beam status ² Detector status ² Highlight of latest results ² Future plans
- 2. The T2K experiment 08/12/17 ICRR Annual Review 2017 2 ~500 researchers from 64 institutions in 12 countries ² Long-baseline neutrino experiment ² Neutrino produced at J-PARC & detected at T2K far detector, Super-Kamiokande ² Off-axis technique to optimize neutrino oscillation measurement. ² Near detectors to constrain flux & neutrino interaction model ² Discovered appearance of (2013) ² Leading effort of CP violation search ² Vibrant programs of non-standard physics & neutrino interactions ⌫µ ! ⌫e
- 3. J-PARC neutrino beam status 08/12/17 ICRR Annual Review 2017 3 AccumulatedPOT 0 5 10 15 20 25 2010 2011 2012 2013 2014 2015 2016 Run1 Run2 Run3 Run4 Run5 Run6 Run7 Run8 BeamPower(kW) 0 100 200 300 400 500 20 10× Total Accumulated POT for Physics -Mode Beam Powerν -Mode Beam Powerν 23 January 2010 – 12 April 2017 Total POT: 22.54 x 1020 ν mode POT: 14.93 x 1020 (66.2%) ν mode POT: 7.62 x 1020 (33.8%) _ ² Stable operation with 470kW beam power ² Double neutrino data in 1 year! ² Totally 22.50 x 1020 POT collected, ~30% of currently approved exposure
- 4. J-PARC neutrino beam status (cont’d) 08/12/17 ICRR Annual Review 2017 4 ² Stability of 𝜈 production rate monitored by T2K on-axis INGRID detector ² Stability of 𝜈 beam direction monitored by INGRID and MUMON (1mrad shift corresponds to 2% shift in 𝜈 peak energy) Day [events/1e14POT] 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Event rate Horn250kA Horn205kA Horn-250kA [mrad] 1− 0.5− 0 0.5 Horizontal beam direction INGRID MUMON Day [mrad] 1− 0.5− 0 0.5 1 Vertical beam direction INGRID MUMON T2K Run1 Jan.2010-Jun.2010 T2K Run2 Nov.2010-Mar.2011 T2K Run3 Mar.2012-Jun.2012 T2K Run4 Oct.2012-May.2013 T2K Run5 May.2014 -Jun.2014 T2K Run6 Oct.2014-June.2015 T2K Run7 Feb.2016-May.2016 T2K Run8 Oct.2016-Apr.2017
- 5. T2K far detector status 08/12/17 ICRR Annual Review 2017 5 ² Super-K performs stably ² Data taking efficiency of 98.8% for T2K run8 Super-Kamiokande (41.4 m tall x 39.3m diameter) 22.5 ktons fiducial volume 1000m underground 2.5 12/31 2008 12/31 2009 12/31 2010 12/31 2011 12/31 2012 12/31 2013 12/31 2014 12/31 2015 12/31 2016Event/day 0 2 4 6 8 10 12 attenuationlength[m] date using bottom PMT 60 65 70 75 80 85 90 95 100 105 110 01/01/09 01/01/10 01/01/11 01/01/12 01/01/13 01/01/14 01/01/15 01/01/16 01/01/17 Atmospheric 𝜈 FCFV events
- 6. Analysis improvements 08/12/17 ICRR Annual Review 2017 6 ² Super-K event selection & new data sample ² Use fiTQun algorithm (complete charge & time information) à enable to extend detector fiducial volume, lead to 20% effectively statistic increases in selecting e-like events ² Add CC1𝜋 e-like sample à increase 10% for neutrino mode e-like ² Usage of ND280 data ² Include FGD2 (water targets) to include interactions on water ² Interaction model improvements in NEUT (neutrino event generator) ² Improve pion production model ² Include a model for multi-nucleon scattering ² Improve CCQE model by including effect of long-range correlations in nucleus
- 7. Far detector data samples with fit 08/12/17 ICRR Annual Review 2017 7 Reconstructed Energy (GeV)ν 0 0.2 0.4 0.6 0.8 1 1.2NumberofEvents 0 2 4 6 8 10 12 eν→µν eν→µν NC intrinsiceν/eν intrinsicµν intrinsicµν T2K Run1-8 PreliminaryFinal systematics pending Reconstructed Energy (GeV)ν 0 0.2 0.4 0.6 0.8 1 1.2 NumberofEvents 0 0.5 1 1.5 2 2.5 3 3.5 eν→µν eν→µν NC intrinsiceν/eν intrinsicµν intrinsicµν T2K Run1-8 PreliminaryFinal systematics pending Reconstructed Energy (GeV)ν 0 0.2 0.4 0.6 0.8 1 1.2 NumberofEvents 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 eν→µν eν→µν NC intrinsiceν/eν intrinsicµν intrinsicµν T2K Run1-8 PreliminaryFinal systematics pending Reconstructed Energy (GeV)ν 0 0.5 1 1.5 2 2.5 3 NumberofEvents 0 5 10 15 20 25 30 eν→µν eν→µν NC intrinsiceν/eν intrinsicµν intrinsicµν T2K Run1-8 PreliminaryFinal systematics pending Reconstructed Energy (GeV)ν 0 0.5 1 1.5 2 2.5 3 NumberofEvents 0 2 4 6 8 10 12 eν→µν eν→µν NC intrinsiceν/eν intrinsicµν intrinsicµν T2K Run1-8 PreliminaryFinal systematics pending Neutrino mode Anti-neutrino mode Appearance channelDisappearance channel CCQE 1 𝜇-like ring CCQE 1 e-like ring CC1𝜋 1 e-like ring CCQE 1 𝜇-like ring CCQE 1 e-like ring
- 8. Atmospheric parameter constraint 08/12/17 ICRR Annual Review 2017 8 )23θ(2 sin 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 )-4c2 |(eV32 2 m∆| 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 3− 10× Normal - 68CL Normal - 90CL Inverted - 68CL Inverted - 90CL Best fit T2K Run1-8 PreliminaryFinal systematics pending ² Data is fitted separately for normal and inverted hierarchy Data fit Final systematic error pending (Study of ND data-driven variation show effect on atmospheric parameters) ² Pending final systematic error, results maybe updated in future
- 9. Mixing angle 𝜃13 & 𝛿CP 08/12/17 ICRR Annual Review 2017 9 )13θ(2 sin 10 15 20 25 30 35 40 45 50 3− 10× (Radians)CPδ 3− 2− 1− 0 1 2 3 Normal - 68CL Normal - 90CL Inverted - 68CL Inverted - 90CL Best fit PDG 2016 T2K Run1-8 PreliminaryFinal systematics pending )13θ(2 sin 15 20 25 30 35 3− 10× (Radians)CPδ 3− 2− 1− 0 1 2 3 Normal - 68CL Normal - 90CL Inverted - 68CL Inverted - 90CL Best fit T2K Run1-8 PreliminaryFinal systematics pending ² T2K sin2 𝜃13 measurement is consistent with PDG 2016 average T2K value: PDG 2016: ² Include the reactor constraint on 𝜃13 improves constraint on 𝛿CP sin2 ✓13 = 0.0277+0.0054 0.0047 (NH) sin2 ✓13 = 0.0210 ± 0.0011 w/ reactor constraint
- 10. 𝛿CP measurement 08/12/17 ICRR Annual Review 2017 10 (rad)CPδ 3− 2− 1− 0 1 2 3 ln(L)∆-2 0 5 10 15 20 25 30 Normal Inverted T2K Run1-8 PreliminaryFinal systematics pending ² 1𝝈 CL. confidence interval Normal Hierarchy [-2.49, -1.23] rad. ² 2 𝝈 CL. confidence interval Normal hierarchy [-2.91, -0.60] rad. Inverted hierarchy [-1.54, -1.19] rad. à CP conserving values (0, 𝜋) fall outside of the 2𝝈 CL. confidence/credible interval 2𝝈 CL. intervals (rad.)CPδ 3− 2− 1− 0 1 2 3 Posteriorprobabilitydensity 0 0.1 0.2 0.3 0.4 0.5 0.6 95.4% Credible Interval 90% Credible Interval 68% Credible Interval T2K Run 1-8 preliminary Frequentist Bayesian Reconstructed Energy (GeV)ν 0 0.2 0.4 0.6 0.8 1 1.2 NumberofEvents 4− 2− 0 2 4 6 8 10 12 14 16 T2K Run1-8 Preliminary = 0CP δ Data
- 11. Future plans 08/12/17 ICRR Annual Review 2017 11 Short-term ² Requested 9x1020 POT before summer 2018 (mainly in anti-neutrino mode) ² Super-K tank open from June 2018 to repair the leak, install a new water pipe and replace dead PMT Long-term ² Upgrade MR power supplies to increase beam power ² T2K-II ² Proposal to collect 20 x 1021 by JFY2026 ² Neutrino beamline upgrade & analysis improvement to effectively add 50% statistics ² ND280 upgrade is proposed and formally approved by T2K JFY 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 MRBeamPower[kW] 0 200 400 600 800 1000 1200 1400 POT]21 IntegratedDeliveredProtons[10 0 5 10 15 20 25 30 35 40 45 POT]21 .[10July)−(Oct.DeliveredProtons/Period 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 MR Power Supply upgrade T2K-II Protons-On-Target Request )°(CP δTrue 200− 100− 0 100 200 =0CPδtoexcludesin2 χ∆ 0 5 10 15 20 =0.4323θ2 True sin =0.5023θ2 True sin =0.6023θ2 True sin POT w/ eff. stat. & sys. improvements21 20x10 POT w/ 2016 sys. errs.21 7.8x10 90% C.L. 99% C.L. C.L.σ3
- 12. Summary 08/12/17 ICRR Annual Review 2017 12 ² T2K primary goal ( ) has achieved but our journey is not over. Now is an exciting and challenging time. ² T2K is leading the effort to measure CP violation & continues to produce high-impact results. ² T2K future plans are happening now! Physics prospects of T2K-II and ND280 upgrades are sensational! ⌫µ ! ⌫e ⌫µ ! ⌫e