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Neutrino Oscillation Physics Potential of T2K Phase 2 - a Possible Extension of The T2K Experiment
The document discusses the potential for an extended Phase 2 of the T2K neutrino oscillation experiment. With an additional exposure of 20x1021 protons on target, T2K Phase 2 could achieve approximately 3σ sensitivity to CP violation if the unknown CP phase δCP is -π/2. It could also measure neutrino oscillation parameters like the atmospheric mass splitting Δm232 to 1% precision and the mixing angle θ23 to 0.5-1.7° precision. Systematic uncertainties are projected to be reduced from the current 5.5-6.8% to around 4%, which would further improve the sensitivity to CP violation and mass ordering. The proposed extension could continue T2K's physics program until 2026
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Neutrino Oscillation Physics Potential of T2K Phase 2 - a Possible Extension of The T2K Experiment
- 1. S. V. Cao KyotoUniversity (On behalf of the T2K collaboration ) Neutrino Oscillation Physics Potential of T2K Phase 2 - a Possible Extension of The T2K Experiment 3/14/16 51st Renconstres de Moriond
- 2. T2K experiment 3/14/16 51stRenconstres de Moriond High intensity, almost pure muon (anti) neutrino beam from J-PARC The world’s first off-axis designed neutrino experiment Far Detector (SK) is 2.50 off the beam’s axis Narrow band beam, peaked at oscillation maximum (0.6 GeV) 5 10 5 0 30 60 90 120 150 180 Angle(degrees) Data Best fit Background component Momentum (MeV/c) 0 500 1000 1500 0 0.2 0.4 0.6 0.8 1 Data Best fit (km/GeV)Recon.L/E 2 10 3 10 0 0.5 1 1.5 Ratiotono oscillations Events/0.1GeV 0 20 40 60 DATA Best-fit MC with Oscillations MC without Oscillations 0 Events/100MeV 2 4 6 8 10 12 14 No oscillation Best fit spectra Data Energy (GeV)mnReconstructed 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Ratio 0.5 1 1.5 PRL. 112, 181801 (2014)PRL 112, 061802 (2014) Primary goal is to measure precisely neutrino oscillations Stay tuned for: Observe CP phase Unknowns… T2K Preliminary T2K Preliminary 2 See Christine’s talk arXiv:1515.02495Paper in preparation
- 3. T2K Phase 2proposal 3/14/16 51st Renconstres de Moriond Approved T2K statistics, 7.8 x1021 POT, can be accumulated by JFY2020 Hyper-K and DUNE are expected to start around 2026 T2K Phase 2, if extended to JFY2026, collects ~ 20x1021 POT Neutrino beamline upgrade & analysis improvements (SK fiducial volume, add new event sample) Effectively add 50% statistics Reduction of systematic uncertainties to enhance CPV sensitivity 3 Number of events expected at T2K far detector with full proposed T2K Phase 2 exposure J-PARC Main Ring expected beam power & T2K Phase 2 accumulation scenario
- 4. T2K Phase 2sensitivity to CPV 3/14/16 51st Renconstres de Moriond 2016 work-in-progress systematic uncertainty is implemented ~ 3𝜎 significance sensitivity to CP violation if 𝛿CP= - 𝜋/2 99% C.L. significance for more than 35% of the possible true values of 𝛿CP 4 )21 Protons-on-Target (x10 0 5 10 15 20 =0CPdtoexcludesin2 cD 0 5 10 15 =0.4323 q2 True sin =0.5023 q2 True sin =0.6023 q2 True sin 90% C.L. 99% C.L. C.L.s3 w/ eff. stat. improvements (no sys. errs.) w/ 2016 sys. errs. Work in Progress )°(CPdTrue 200- 100- 0 100 200 =0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 True sin 90% C.L. 99% C.L. C.L.s3 POT w/ eff. stat. improvements & 2016 sys. errs.21 20x10 POT w/ 2016 sys. errs.21 7.8x10 Work in Progress
- 5. T2K Phase 2sensitivity to CPV 3/14/16 51st Renconstres de Moriond 5 )21 Protons-on-Target (x10 0 5 10 15 20 =0CPdtoexcludesin2 cD 0 5 10 15 =0.4323 q2 True sin =0.5023 q2 True sin =0.6023 q2 True sin 90% C.L. 99% C.L. C.L.s3 w/ eff. stat. improvements (no sys. errors) w/ eff. stat. & sys. improvements Work in Progress )°(CPdTrue 200- 100- 0 100 200 =0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 True sin 90% C.L. 99% C.L. C.L.s3 POT w/ eff. stat. & sys. improvements21 20x10 POT w/ 2016 sys. errs.21 7.8x10 Work in Progress Improvement of systematic uncertainty is considered > 3𝜎 significance sensitivity to CP violation if 𝛿CP= - 𝜋/2 99% C.L. significance for more than 45% of the possible true values of 𝛿CP
- 6. T2K Phase 2sensitivity to atmospheric parameters 3/14/16 51st Renconstres de Moriond 1% precision of 𝛥m2 23 0.5o - 1.7o precision of 𝜃23 depending on its true value ~3𝜎 significance for resolving 𝜃23 octant if sin2 𝜃23 >0.6 or sin2 𝜃23 <0.43 23 q2 sin 0.4 0.5 0.6 32 2 mD 2.2 2.4 2.6 2.8 3 3- 10´ Current POT , 90% C.L POT, 90% C.L21 7.8x10 POT w/improvement, 90% C.L21 20x10 Stat. only Systematics Work in Progress 23 q2 sin 0.4 0.5 0.6 32 2 mD 2.2 2.4 2.6 2.8 3 3- 10´ Current POT , 90% C.L POT, 90% C.L21 7.8x10 POT w/improvement, 90% C.L21 20x10 Stat. only Systematics Work in Progress 6
- 7. Other prospects ofT2K Phase 2 & Summary 3/14/16 51st Renconstres de Moriond Various new physics opportunities Sterile neutrino search Non-standard interactions with matter CPT and Lorentz invariance test Other unknowns Understand neutrino interactions Explore currently statistic-limited channels Build a proper model for neutrino interactions The proposed T2K Phase 2 attracts a strong interest from the T2K collaboration to pursue exploration of CP violation in a wide range of 𝛿CP, 3𝜎 or higher at maximum CP violation, precise measurement of neutrino parameters and possibility for new physics search. 7
- 8. 3/14/16 51st Renconstresde Moriond 8 Thank you!
- 9. Backup: T2K sensitivityto CPV 3/14/16 51st Renconstres de Moriond 9 )21 Protons-on-Target (x10 0 2 4 6 =0CPdtoexcludesin2 cD 0 1 2 3 4 5 =0.4323 q2 True sin =0.5023 q2 True sin =0.6023 q2 True sin 90% C.L. w/ no systematic error w/ 2016 systematic error Work in Progress
- 10. Backup: Systematic uncertainty 3/14/1651st Renconstres de Moriond Current systematics is 5.5% to 6.8% Projected systematic error is ~4% 10
- 11. Backup: Unknown &known MH 3/14/16 51st Renconstres de Moriond 11 )°(CPdTrue 200- 100- 0 100 200 =0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 True sin 90% C.L. 99% C.L. C.L.s3 POT w/ eff. stat. & sys. improvements21 20x10 POT w/ 2016 sys. errs.21 7.8x10 Work in Progress )°(CPdTrue 200- 100- 0 100 200=0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 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.s3 Work in Progress With systematic improvements
- 12. Backup: Unknown &known MH 3/14/16 51st Renconstres de Moriond 12 )°(CPdTrue 200- 100- 0 100 200 =0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 True sin 90% C.L. 99% C.L. C.L.s3 POT w/ eff. stat. improvements & 2016 sys. errs.21 20x10 POT w/ 2016 sys. errs.21 7.8x10 Work in Progress )°(CPdTrue 200- 100- 0 100 200=0CPdtoexcludesin2 cD 0 5 10 15 20 =0.4323q2 True sin =0.5023q2 True sin =0.6023q2 True sin POT w/ eff. stat. improvements & 2016 sys. errs.21 20x10 POT w/ 2016 sys. errs.21 7.8x10 90% C.L. 99% C.L. C.L.s3 Work in Progress Without systematic improvements
Editor's Notes
- #3 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #4 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #5 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #6 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #7 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #8 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #9 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #10 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #11 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #12 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)
- #13 U_{\text{PMNS}}= \left( \begin{matrix} 1 & 0 & 0\\ 0 &c_{23} & s_{23}\\ 0 & -s_{23} & c_{23} \end{matrix} \right) \left( \begin{matrix} c_{13} & 0 & s_{13}e^{-i\delta_{\text{CP}}}\\ 0 &1 & 0\\ -s_{13}e^{i\delta_{\text{CP}}} & 0 & c_{13} \end{matrix} \right) \left( \begin{matrix} c_{12} & s_{12} & 0\\ -s_{12} &c_{12} & 0\\ 0 & 0 & 1 \end{matrix} \right)