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Yury Kudenko Institute for Nuclear Research RAS

Accelerator neutrino experiments : new results and perspectives. Yury Kudenko Institute for Nuclear Research RAS. NPD RAS Session ITEP , 30 November 2007г. Neutrino oscillations К2К MINOS OPERA MiniBooNE Т2К NOVA.     . m 23 2 , sin 2 2 23.     . LSND.

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Yury Kudenko Institute for Nuclear Research RAS

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  1. Accelerator neutrino experiments: new results and perspectives Yury Kudenko Institute for Nuclear Research RAS NPD RAS Session ITEP, 30 November 2007г.

  2. Neutrino oscillations К2К MINOS OPERA MiniBooNE Т2К NOVA   m232, sin2223   LSND sterile   e 13 CP(?) Yury Kudenko INR RAS

  3. Mixing matrix 3 families solar atmospheric link between atmospheric and solar U parameterization: three mixing angles12 13 23 CP violating phase two independent m2 Yury Kudenko INR RAS

  4. Mixing and masses Oscillation parameters central value 2 interval m212 (10-5 eV2) 7.6 7.1 - 8.3 m231 (10-3eV2) 2.4 2.0 - 2.8 sin212 0.32 0.26 - 0.40 sin223 0.50 0.34 - 0.67 sin213 0.0 <0.05 Global data from: solar, atmospheric, reactor, LBL accelerator experiments 3 families Mixing Quarks Leptons 1-2 12 13o 33o 2-3 23 2.3o 45o 1-3 13 0.5o <10o CP = ? Yury Kudenko INR RAS

  5. Mass spectrum sin213 2 3 } m2sol 1 m2atm or (Mass)2 m2atm 2 } m2sol 3 1 sin213 [|Ui|2] [|Ui|2] e [|Uei|2] Inverted Normal Yury Kudenko INR RAS

  6. Long baseline accelerator experiments Main goals: search for   e 13 precise measurement m223 23 mass hierarchy m213 > 0 or m213 < 0 CP CP  13 Ue3 = sin 13exp(-iCP) LBL experiments cannot distinguish between Dirac and Majorana neutrinos do not provide information about absolute  mass Yury Kudenko INR RAS

  7. Oscillation experiments: Appearance and Disappearance Yury Kudenko INR RAS

  8. First LBL experiment К2К  disappearance 1999-2005 (x) m2  210-3ev2 L/E 200 L=250 km <E>  1.3 GeV  98.2% e1.3% Predictions of  flux and interactions at Far Detector by Far/Near ratio Signal of  oscillation at K2K Reduction of  events Distortion of energy spectrum ~1 event/2 days at SK Yury Kudenko INR RAS

  9. K2K final result PRD74:072003,2006 + - # Events - Shape distortion Expected: 158.1 + 9.2 – 8.6 Observed: 112 Expected shape (no oscillation) Best fit Null oscillation probability #events 0.06% (3.4) shape 0.42% (2.9) Null oscillation probability (shape + # events) = 0.0015% (4.3) Kolmogorov-Smirnov test Best fit probability = 37% Best fit values sin22 = 1.00 m2 [eV2] = (2.80  0.36)10-3 Yury Kudenko INR RAS

  10. MINOS 735 km Far Det: 5400 tons Near Det: 980 tons Precise study of “atmospheric” neutrino oscillations, using the NUMI beam and two detectors Beam:NuMI beam, 120 GeV Protons- beam Detectors:ND, FD Far Det:5.4 kton magnetized Fe/Sci Tracker/Calorimeter at Soudan, MN (L=735 km) Near Det:980 ton version of FD, at FNAL (L  1 km) Yury Kudenko INR RAS

  11. First MINOS result PRL 97(2006)191801 1.27x1020 POT  expect: 336  14.4 detect: 215 k2k Best fit values sin22 = 1.00 m2 [eV2 ] = (2.74 + 0.44 - 0.26)  10-3 Yury Kudenko INR RAS

  12. New MINOS result J.Thomas, talk at Lepton-Photon2007 2.50 POT analyzed ≈ 2x statistics of 2006 result Improved analysis # expected (no osc.) 73830 # observed 563 Comparison of new and old MINOS results m223 =(2.38 +0.20 -0.16) x 10-3 sin2223=1.00 -0.08 Yury Kudenko INR RAS

  13. m223 and 23: SK/K2K/MINOS |m223|| m213|= (2.4  0.2)x10-3 eV2 23 ~ 45o Yury Kudenko INR RAS

  14. MINOS: projected sensitivity M.Ishitsuka, talk at NNN07 After 5 years running: expected accuracy of m232 and sin2223 10% chance for first indication of non-zero 13 Yury Kudenko INR RAS

  15. 1 mm t  Pb Emulsion layers High energy, long baseline n beam ( E  17 GeV L ~ 730 km ) OPERA   direct search P(  ) = cos413sin223sin2[1.27m223L(km)/E(GeV)] kink Target mass ~1300t E/L ~ 2.310-2  10m223 (atm)   pure beam: 2% anti  <1% e  after 5 years data taking: ~22000  interactions ~120  interactions ~12  reconstructed <1 background event   Yury Kudenko INR RAS

  16. e » ¸ ( 0 . 1 0 . 3 )% miss charge OPERA Detector Muon spectrometers p/p < 20% for p<50 GeV n beam Two supermodules • Hybrid Detector: • Two supermodules – Target Mass 1766 tons • 2 Magnetic spectrometers with RPC & Drift tubes • 2 x [31 Target Tracker planes and Target Walls] • 206,336 “ECC bricks” (56 Pb/Emulsion layers) • 12 M Emulsion plates (thin double-coated) Yury Kudenko INR RAS

  17. OPERA:  sensitivity M.Spinetti, talk at NNN07 full mixing, 5 years run 4.5 x1019pot/y New MINOS Yury Kudenko INR RAS

  18. 13: global T. Schwetz, hep/ph 0606060 13  100 Yury Kudenko INR RAS

  19. LSND result m2 = 0.2 – 10 eV2 best fit: m2 = 0.2–10 eV2 sin22 = 0.003 Yury Kudenko INR RAS

  20. Oscillations before first MiniBooNe result Yury Kudenko INR RAS

  21. MiniBooNE FNAL 8 GeV Beamline 50 m decay pipe 12m sphere filled withmineral oil and 1520 PMTslocated 500m from source decay region:   ,  K   “little muon counters:” measure K flux in-situ magnetic horn: meson focusing MiniBooNE detector Protons from the 8 GeV booster Neutrino Beam <E>~ 1 GeV  →e? movable absorber: stops muons, undecayed mesons e ??? Yury Kudenko INR RAS

  22. MiniBooNE result 6 x1020 POT PRL 98:231801,2007 [arXiv:0704.1500] No e excess in oscillation signal region E> 475 MeV however Yury Kudenko INR RAS

  23. MiniBooNE result No evidence for   e appearance oscillations •   e (LSND anti-nu) • excess at low energy Yury Kudenko INR RAS

  24. Possible interpretations if low-energy excess is confirmed to be a real signal • Non-oscillation  + N   + N +  + N +  Coupling between , Z and    2.610-41(E/GeV)6(g/10)4 cm2 С.С.Герштейн, Ю.Я.Комаченко, М.Ю.Хлопов, ЯФ 33 (1981) 1597 J.Harvey, C.Hill, R.Hill, arXiv:0708.1281[hep-ph] • Oscillation 3 +1 model ruled out M.Maltoni, T.Schwetz, arXiv:0051.0107[hep-ph] 3 + 2 or 3 + 3 models M.Maltoni, T.Schwetz, arXiv:0051.0107[hep-ph] A.Nelson, J.Walsh, arXiv:0711.1363[hep-ph] Extra dimensions H.Pas, S.Pakvasa, T.Weiler, hep-ph/0504096 (prediced low-energy excess) Lorentz violation T.Katori, A.Kostelecky, R.Tayloe, hep-ph/0606154 Yury Kudenko INR RAS

  25. Second generation LBL experiments Off Axis Neutrino Beams • Increases flux on oscillation maximum • Reduces high-energy tail and NC backgrounds • Reduces e contamination from K and  decay T2K NOVA Yury Kudenko INR RAS

  26. T2K(Tokai toKamioka) JPARC facility ~1GeV  beam (100 of K2K)  beam off-axis on-axis JPARC MINOS Opera K2K E(GeV) 50 120 400 12 Int(1012 ppp) 330 40 24 6 Rate (Hz) 0.29 0.53 0.17 0.45 Power (MW) 0.77 0.41 0.5 0.0052 Statistics at SK OAB 2.5 deg, 1 yr = 1021 POT, 22.5 kt ~ 2200  tot ~ 1600  charged current e < 0.5% at  peak Yury Kudenko INR RAS

  27. SuperK q Decay Pipe Target Horns T2K off-axis beam 0o OA2° OA2.5° OA3° 0 deg Yury Kudenko INR RAS

  28. p p n off-axis on-axis 0m 140m 280m 2 km 295 km neutrino decay volume T2K setup Possible Future  T2K-II ND280m ND2km  monitor SK Yury Kudenko INR RAS

  29. Principle Goals of T2K - Search for e appearance 13 sensitivity  1o (90% c.l.) Background uncertainty 10% CP = 0 CP = /2 CP = - /2 CP =  m2=2.5x10-3 • Measurement m223 • with accuracy of 1% • (sin2223)  0.01 • (m223) < 110-4 eV2 Yury Kudenko INR RAS

  30. T2K sensitivity to 13 CHOOZ limit ambiguities: CP - 13signm223 23 Yury Kudenko INR RAS

  31. 15.4m 70m 15.4m NOA 810 km baseline Far Detector • 15 ktons 15.4m x 15.4m x 70m • 1003 liquid scintillator planes (~80% active) • Scintillator cells 3.8 x 6.0 x 1540 cm3 • Read out from one side per plane with APDs Near detector Active element: Liquid scintillator U-shaped WLS fiber Yury Kudenko INR RAS

  32. NOA P(  e) depends on sin2213 sign m223 CP matter effects increase (decrease) oscillations for normal (inverted) hierarchy for  Mass hierarchy can be resolved if 13 near to present limit using both  anti- beams and sin2213 from T2K + reactor experiments Yury Kudenko INR RAS

  33. 13sensitivities vs time A.Blondel et al., hep-ph/0606111 Daya Bay goal Short baseline reactor experiments Double-Chooz and Daya Bay 13 ( insensitive to CP) Yury Kudenko INR RAS

  34. Conclusion K2K confirmation of atmospheric neutrino oscillations discovered by SK MINOSconfirmed the SK и K2K results high precision measurements of oscillation parameters MiniBooNerules out (98% cl) the LSND result as  e oscilations withm2 ~ 1 eV2 new anomaly appears run with anti- beam OPERA data takingbegun in 2007 T2K-I neutrino beam in 2009 Main goal for next 5 years:13 Yury Kudenko INR RAS

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