1. Status of OPERA N. Naganawa (Nagoya University) 20090310 Flavor physics

2. Toki, Gifu pref.

3. Tono Mine Nagoya Kyoto Osaka Tokyo Kamioka Gamagori Toki

4. Tono Mine Scanning Lab

6. Now, tau decay search is going on.

7. OPERA Film

8. The OPERA Film OPERA film emulsion (44 μm)‏ emulsion (44 μm)‏ plastic base (205 μm)‏ Sub micron crystal 3D tracking device 50 micron Microscopic Image Recorded as silver grain along the line particle passed through sensitivity : 36grains/100micron

9. INFN Gran Sasso Institute CERN SPS 730km The CNGS beam conventional beam  ( m -2 / pot) 7.45x10 -9  CC / pot / kton 5.44x10 -17 ( GeV ) 17 ( e + e ) /  0.85 %  /  2.0 % t prompt negligible ν μ Appearance ? τ ν The beam is optimized for t appearance in the atmospheric oscillation region Δm 23 2 = (2.43±0.13)×10 -3 eV 2 sin 2 2θ 23 = 1.0 10 in 5 years?

10. OPERA Detector @ Gran sasso ν 1000m underground 1.3 kton

11. OPERA Detector ν Emulsion + Target Tracker Muon spectrometer

12. OPERA Detector ν Emulsion Detector (ECC) Target Tracker (TT)

13. ECC （ Emulsion Cloud Chamber ） 125mm 100mm 75.4mm 8.3kg 10X 0 57 emulsion films and 56 Pb plates piled up.

14. OPERA Detector ν

15. 2008 Run : Examples of Neutrino Event

16. ECC ν 2008 Run : Examples of Neutrino Event

19. Flow of analysis The most probable brick is detected by brick finding algorithm extraction CSECC ν

20. Extraction of ECC Brick Manipulator System (LAPP France)‏

22. Flow of analysis The most probable brick is detected by brick finding algorithm extraction CS Development → Scanning half @ Gran sasso, half @ Tono CSECC ν

23. Suts で CS すきゃん CS scanning with S-UTS @ Tono Now 5 S-UTS are working. 20 films / day Fukuda’s talk After tracks from neutrino events are found on CS, ECC will be developed.

24. Gran Sasso の現像場の絵 Automatic developing system, max ～ 20 ECC/day.

25. Sending films from Gran Sasso

27. “Sheeting” of emulsion films. ECC emulsion films arrives from Gran Sasso. @ Tono

29. Finding vertex in ECC Umut’s talk plate changer

30.  Topology -- 15.2 ％   → h - h - h + Trident 49.5 ％  → h- → h- 17.4 ％  → μ- → μ- 17.8 ％  → e- → e- Kink Principle of detecting tau neutrino   -, e -, h - h h cτ = 87 micron Tau life time short  impact parameter to vertex is small  nuclear emulsion (sub um resolution)‏  nuclear emulsion (sub um resolution)‏ Feature of neutrino tau event  No lepton except tau at 1ry vertex  A decay candidate consistent with tau Decay search Nonoyama’s talk

31. Tau Neutrino Interaction Detected In ECC by DONUT exp.

32. Pb1 mm Basic “cell” Emulsion Flow of analysis Electronic detectors: Brick finding supermodule 8 m Target Trackers Pb/Em. target Spectrometer  muon ID, charge and p Pb/Em. brick 8 cm Emulsion analysis: Vertex, decay kink, e/  ID, multiple scattering, kinematics Extract selected brick

33. Beam status before 2008 May 2006: completion of electronic detectors commissioning Target Tracker worked well. 0.076 E 19 pot Aug 2006: technical run, 0.076 E 19 pot collected 319 319 muons from interactions in detector front rock Target Tracker and CS worked well. 0.082 E 19 pot Oct 2007: short physics run (~40% target) 0.082 E 19 pot collected 38 38 neutrino events collected in ECC targets Full chain analysis was done.

34. Beam status 2008 2007 run neutrino delivery stopped, due to Radiation damage of Ventilation system of CNGS target area  The Beam target area was shielded by concrete. and no problem any more on Ventilation system Start : Jun 18 End : Nov 03 1.782 E 19 pot 1.782 E 19 pot collected. 1690 1690 neutrino interaction tagged by target tracker. Those candidates are in bricks. 0.7 tau candidates to be confirmed expected @ @Δm2= 2.43 * 10-3 eV2 Increase in the duty cycle since September 24 th - suppression of LHC pilot cycle Further increase after October 6th - stop of fixed target cycle

35. Analysis of 2008’s RUN is going on CS : tracks from neutrino event detected in CS for 922 events ECC : about 500 vertex of neutrino interaction located in ECC.

36. 1.782 E 19 pot Beam loss, vacuum accident 27/6-2/7 Unix Time pot Wed 18/6 17:00 Start of commissioning at low intensity 10/7-18/7 Earth fault on the PS magnet Long MD stop + MTE kicker problem 7/7 6:00 – 10/7 12:00 3/11 8:00 1.782 E 19 pot 18KV cable accident 25/7 PS septum + Long MD 8-14/8 Horn + PS vacuum Week 1/9 CNGS quadrupole 14-17/9 6-8/10 MD Horns filters 19-20/10 Integrated intensity (2008 run)‏

37. 2009 RUN plan Start : May 14 End : Nov 23 173 days  3.6 E 19 pot 3500 events 2.0 tau candidates to be confirmed are expected 2.0 tau candidates to be confirmed are expected together with 2008 run together with 2008 run.

38. 5 years 3 years 2,3 Oscillation sensitivity

39. 39 37 INSTITUTIONS, ~160 PHYSICISTS IPNL, IRES, LAPP INR ITEP JINR, Obninsk Zagreb L’Aquila, Bari, Bologna, Napoli, Padova, Roma, Salerno, LNF, LNGS Bern Neuchatel Zurich Brussels Hamburg, Münster, Rostock Sofia Aichi, Toho Kobe, Nagoya Utsunomiya Technion Haifa METU Ankara IHEP Beijing Shandong Gyeongsang University We are from …..

40. Jan 2009 @ Mizunami, Japan

41. SUMMARY OPERA started from 2008 with full target (1.3kton)‏ 1690 neutrino events are stored in ECC 0.7 tau candidates are expected to be confirmed @  0.7 tau candidates are expected to be confirmed @  m2= 2.43 * 10 -3 eV 2 Analysis chain (counter and emulsion scanning) is working well. About 500 events have been located in ECC. Precise decay hunting/ analysis around the vertex is going on. 2009 neutrino exposure will start May14 3500 neutrino events will be recorded 2.0 tau candidates are expected to be detected together with 2008 run  2.0 tau candidates are expected to be detected together with 2008 run.   appearanceOPERA will detect   appearance (     oscillation) soon ! After OPERA 5 years’ run tau candidate (0.6 BG) events will be collected. 10 tau candidate (0.6 BG) events will be collected.