Status of OPERA

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

2. Toki, Gifu pref.

3. Kamioka Tono Mine Toki Nagoya Tokyo Gamagori Kyoto Osaka

4. Tono Mine Scanning Lab

6. Now, tau decay search is going on.

7. OPERA Film

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

9. conventional  beam ( m-2 / pot) 7.45x10-9 CC / pot / kton 5.44x10-17 < E > ( GeV ) 17 (e + e) /  0.85 % / 2.0 % t prompt negligible The CNGS beam The beam is optimized for tappearance in the atmospheric oscillation region Δm232 = (2.43±0.13)×10-3 eV2 sin22θ23 = 1.0 CERN SPS ν μ ν 730km τ Appearance ? 10 in 5 years? INFN Gran Sasso Institute

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

11. OPERA Detector Muon spectrometer Emulsion + Target Tracker ν

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

13. ECC （Emulsion Cloud Chamber） 75.4mm 125mm 100mm 8.3kg 10X0 57 emulsion films and 56 Pb plates piled up.

14. OPERA Detector ν

15. 2008 Run : Examples of Neutrino Event

16. 2008 Run : Examples of Neutrino Event ν ECC

17. 2008 Run : Examples of Neutrino Event

18. 2008 Run : Examples of Neutrino Event

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

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

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

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

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

25. Sending films from Gran Sasso

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

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

30. Kink 　→　e- 17.8 ％  　→　μ- 17.4 ％  　→　h- 49.5 ％ Trident  　→　h- h- h+ 15.2 ％ Principle of detecting tau neutrino  Topology cτ = 87 micron  -, e-, h- - h h Tau life time short  impact parameter to vertex is small  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. 8 cm Emulsion analysis: Vertex, decay kink, e/gID, multiple scattering, kinematics 8 m Spectrometer Target Trackers Pb/Em. target supermodule  Pb/Em. brick Basic “cell” Pb Emulsion 1 mm Flow of analysis Electronic detectors: Extract selected brick Brick finding muon ID, charge and p

33. Beam status before 2008 May 2006: completion of electronic detectors commissioning Target Tracker worked well . Aug 2006: technical run, 0.076E19 potcollected 319 muons from interactions in detector front rock Target Tracker and CS worked well . Oct 2007: short physics run (~40% target) 0.082E19 pot collected 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 1.782E19 pot collected. 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 24th - 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. pot 1.782E19 pot 3/11 8:00 1.782E19 pot Integrated intensity (2008 run)‏ Horns filters 19-20/10 18KV cable accident 25/7 6-8/10 MD CNGS quadrupole 14-17/9 10/7-18/7 Earth fault on the PS magnet Beam loss, vacuum accident 27/6-2/7 Horn + PS vacuum Week 1/9 Wed 18/6 17:00 Start of commissioning at low intensity PS septum + Long MD 8-14/8 Long MD stop + MTE kicker problem 7/7 6:00 – 10/7 12:00 Unix Time

37. 2009 RUN plan Start : May 14 End : Nov 23173 days  3.6E19 pot 3500 events 2.0 tau candidatesto be confirmed are expected together with 2008 run.

38. 5 years 3 years Oscillation sensitivity 2,3

39. Brussels Bern Neuchatel Zurich IPNL, IRES, LAPP INR ITEP JINR, Obninsk Zagreb Hamburg, Münster, Rostock Sofia IHEP Beijing Shandong Aichi, Toho Kobe, Nagoya Utsunomiya L’Aquila, Bari, Bologna, Napoli, Padova, Roma, Salerno, LNF, LNGS Technion Haifa Gyeongsang University 37 INSTITUTIONS, ~160 PHYSICISTS METU Ankara 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 candidatesare expected to be confirmed @m2= 2.43 * 10-3 eV2 • 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 candidatesare expected to be detected together with 2008 run. • OPERA will detect appearance (oscillation) soon ! • After OPERA 5 years’ run 10 tau candidate(0.6 BG) events will be collected .