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Present And Near Future of θ 13 & CPV in Neutrino Experiments

Present And Near Future of θ 13 & CPV in Neutrino Experiments. Neutrino Mixing and Oscillation Probabilities LBL Accelerator Experiments under construction: Opera, Icarus, Minos next generation: T2K, NUMI Off-Axis Reactor Experiments Conclusion. Caren Hagner Universit ät Hamburg.

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Present And Near Future of θ 13 & CPV in Neutrino Experiments

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  1. Present And Near Future of θ13& CPV in Neutrino Experiments • Neutrino Mixing and Oscillation Probabilities • LBL Accelerator Experiments • under construction:Opera, Icarus, Minos • next generation:T2K, NUMI Off-Axis • Reactor Experiments • Conclusion Caren HagnerUniversität Hamburg

  2. Neutrino Mixing θ12 θ13, δ ?? θ23 atmospheric, K2K CHOOZ solar, Kamland

  3. Survival probability: 0 3 2 1 L in Losz Neutrino Oscillations: Vacuum (2 Flavors)

  4. Neutrino Parameters: Global Fits Global fit including solar, atmospheric, reactor (Kamland and CHOOZ) and accelerator (K2K) data. M. Maltoni, T.Schwetz, A.M.Tortola, J.W.F.Valle, Phys. Rev. D68 (2003) 113010, hep-ph/0309130. Parameter Best-fit value Range (3σ) Δm221 6.9 × 10-5 eV2 (5.4 ÷ 9.5) × 10-5 eV2 |Δm231| 2.6 × 10-3 eV2 (1.5 ÷ 3.7) × 10-3 eV2 θ12(sin2 θ12) 33.2o (0.30) 28.6o ÷ 38.6o θ23 (sin2 θ23) 46.1o(0.52) 33.8o ÷ 58.1o θ13(sin2 θ13) 4.4o(0.006) 0o ÷ 13.4o (< 0.054) δCP - 0 ÷ 2π Fixing Δm2atm= 2 × 10-3 eV2 they obtain at 90%C.L. (3σ):sin2 θ13 ≤ 0.035 (0.066) sin2 2θ13≤ 0.14 (0.25)

  5. e e (disappearance experiment) Pth= 8.5 GWth, L = 1,1 km, M = 5toverburden: 300 mwe CHOOZ R = 1.01  2.8%(stat)2.7%(syst) @m2atm=2×10-3 eV2 sin22θ13 < 0.2 (90% C.L) M. Apollonio et. al., Eur.Phys.J. C27 (2003) 331-374

  6. SK: Evidence For Oscillation Pattern New! Select events with high resolution in L/E from Noon2004

  7. SK: Events with high L/E resolution At 90% CL: Δm2 = (1.9 ÷ 3.0) × 10-3 eV2 sin22θ ≥ 0.9

  8. (anti-v) (α) Δ with 3 Flavor Transition Probabilities (In vacuum, on atmospheric osc. scale) LBL neutrino beams θ13 , δCP, mass hierarchybut degeneracies & correlations! precision on θ23 and Δm231 Reactor experiments clean measurement of θ13 from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

  9. Overview: Experiments

  10. sin22θ13 CNGS Neutrino Beam Cern to Gran Sasso: 730km, <Ev> = 17GeV Possible channels: vμ→vT appearance vμ→vμ disappearance vμ→ve appearance

  11. 7.3 1.8 kton 11.4 0.7 OPERA target mass: 1.77 ktons Main goal: search for vT appearance:full mixing, 5 years run at 4.5 × 1019 pot/year

  12. 0.06 or 7o OPERA: Sensitivity to θ13 method: ve appearance in vμ beam (εe = 0.7) background: e from τ decay, ve beam contamination,vμCC events with missing muon (+ another track mimicking e),vμNC events with neutral pions Fitting simultaneouslyEe, miss. pT, Evis

  13. OPERA: Time Schedule • Nov 2003: SM1 magnet RPC installation (ok) • Sep 2004: SM1 target installation • Jan 2005: BAM and BMS installation • July 2005: start filling bricks • May 2006: start neutrino beam

  14. MINOS Initial conditions:LE option → below τ threshold (3.1GeV)2.5×1020 pot/year New request to Fermilab: 25×1020 pot in 5 years

  15. MINOS: How to measure θ13 far detector at Soudan Mine:steel & scintillator calorimetertarget mass: 5.4 ktons + near detector signal: ve appearance in vμ beam (εe = 0.28) background: e from τ decay (after vμ→ vτ), ve beam contamination (~ 1%),vμCC events with missing muon (+ another track mimicking e),vμNC events with neutral pions

  16. MINOS: Time Schedule • far detector completed in 2003now taking atmospheric neutrino data • near detector installation starts now • beam commissioning starts Dec. 2004 • physics running starts in April 2005 • goal in first year: 2.5×1020 pot

  17. Comparison MINOS, ICARUS, OPERA from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

  18. Comparison MINOS, ICARUS, OPERA from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

  19. … comparision continued After 5 years running (90% C.L.) all combined:sin22θ13 ≤ 0.06 (90%CL) from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

  20. J-PARC Neutrino Facility • approved on Dec.20 2004 • construction from 2004-2008 (JFY) • beam line and near detector @ 280m (without 2km detector) • start experiment in 2009 Off-axis beam: 1,2,3otuned to osc.maximum

  21. → T2K:

  22. → T2K: Sensitivity to θ13

  23. (L = 820km) Numi Off-Axis Experiment Off-axis beamneutrino energy

  24. RPC detector NUMI Off-Axis: Detectors • on the surface • target mass ~ 50ktons • active material: scintillator or RPC • passive material: particle board Scintillator detector

  25. NUMI Off-Axis: Identification of ve ve event vμ event

  26. NUMI Off-Axis: Identification of ve

  27. NUMI Off-Axis: Sensitivity to θ13 • Time Schedule: • R&D proposal submitted • full proposal in march04 • start construction Oct06 • data taking with 25% of detector in 2008

  28. Reactor Neutrino Experiments For θ13 Idea: similar to CHOOZ reactor experiment, but use nearand far detector to reduce systematic error • Europe: Double CHOOZ • US: Diablo Canyon, Braidwood, China, Brazil • Japan: KASKA

  29. e e,, • Isotrope e flux (uranium & plutonium fission fragments) • Detection tag : e + p  e+ + n, <E>~ 4 MeV, Threshold ~1.8 MeV • Disappearance experiment: suppression+shape distorsion between the 2 detectors • 2 IDENTICAL detectors (CHOOZ, KamLAND, BOREXINO/CTF type) • Minimise the uncertainties on reactor flux & spectrum (2 % in CHOOZ) • Cancel cross section uncertainty (1.9 %) • Challenge: relative normalisation between the two detectors < 1% ! Reactor Neutrino Experiments: Method near atm. oscill. maximum D1 = 0-1 km D2 = 1-2 km Nuclear reactor 1,2 core(s)  ON/OFF : ok  4 cores  ON/OFF : no ! Near detector 5-30 tons > 50 mwe Far detector 5-30 tons > 200 mwe

  30. Reactor Experiments: Sites

  31. Japan: KASKA Worlds most powerfulnuclear plant!Pth = 24.3GWbut: 7 reactors

  32. KASKA and KAMLAND Now asking for detector R&D moneysuccessful negotiations for sitenegotiating with reactor safety office ? Start construction 2006? Start data taking 2008

  33. US: Diablo Canyon

  34. Diablo Canyon: Movable Detectors

  35. Reactor Experiments: Sensitivity to θ13 at 90% CL reactor experimentof D - CHOOZ size:sin22θ13 ≤ 0.032 (90%CL) from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

  36. What can we learn about δ? Complementarity of accelerator and reactor experiments is very important!

  37. Concluding Overview from Huber, Lindner, Rolinec, Schwetz, Winter hep-ph/0403068

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