1. NetScan for BL118 PEANUT meeting @ Fermilab 22-23/Jan/2007

2. Possibility of non-bias analysis Naples already did full scanning for one brick. –Giovanni’s report Pilot analysis of BL118 NetScan is started. –5x5 25cm 2 area is scanned by SUTS Today I report first 21 plate data. We used base track for NetScan framework –For the first attempt. –How much we can reduce scanning power is next subject.

3. BL118 short history Exposure –Start : 2005/11/25 21:24:08(GMT) –End : 2006/02/25 23:02:59(GMT) 92days –Trig : 2506482 (Beam stop period was there) ~250 events are expected. 2 times airplane flight –Nagoya ->Fermilab –Fermilab -> Nagoya -> develop

4. 1234553545556571(57 in transportation)2(56 in transportation) Lead 3(55 in transportation) Lead 4(54 in transportation)55(3 in transportation) Lead 54(4 in transportation) Lead 53(5 in transportation) No flip Numbering on plate is 1 Beam direction Numbering on plate is 54 On upstream Brick structure

5. NetScan flow SUTS scanning for both side of film Base track reconstruction Align in transportation order –Reduce tracks reconstructed in transportation order from data set to clean up.(Virtual erasing) –For BL118, there is two transportation alignment. Align in exposure order –ECFSAL is used (Same as DONUT) –ECVTXA is used for vertex hunting.

6. SUTS scanning and base track Details are described in Morishima’s talk 5x5 25cm 2 is scanned –There was some mistakes in data taking –Fully overlapped 4x4cm 2 is used for quality check Base track is formed by SUTS standard software. –I’ve applied too tight base track selection for first trial 2 sigma Base track to micro track angular agreement was required for both X and Y for two emulsion layer. This means maximum tracking efficiency will be 83%. We wanted to see pure PH distribution for future analysis. So I did not cut by PH. (volume <= 2 is reduced)

7. Sample of base track selection This is plotting base tracks to micro track slope difference. But only plotting sum of PH larger than 25. –Minimum PH sum is 13 for this PL05. 2 sigma cut was applied for projected angular difference. –Since Plate 7, also detailed shrinkage error correction is done for selection. For this PL5, 416,733 out of 19,012,417 base track was selected

8. Virtual erasing Align in transportation order to reconstruct tracks while airplane flight. –We could find two transportation alignment as expected. Nagoya -> Fermilab –306,248 out of 4,779,566 for 21plates –Observed track density ~ 600/cm 2 Fermilab -> Nagoya –952,478 out of 4,779,566 for 21plates –Observed track density ~ 2,000/cm 2

9. Nagoya->Fermilab Fermilab->Nagoya Angular distribution

10. Nagoya->Fermilab Fermilab->Nagoya Pulse Height distribution

11. Nagoya->Fermilab Fermilab->Nagoya Efficiency as a function of slope

12. Nagoya->Fermilab Fermilab->Nagoya Efficiency as a function of plate

13. Nagoya->Fermilab Fermilab->Nagoya Overall resolution 8.5mrad10.7mrad10.9mrad14.3mrad Preliminary: Angle resolution is compared to angle obtained by position of first and last plate 4.7  m4.5  m 4.7  m

14. Alignment in exposure Virtual erasing is applied –3,530,479 base track remains for 21 plate. –Right table shows number of base tracks for each plate. –Still large amount of junk base track is there. ECFSAL –139,777 track (nseg>=2) are reconstructed. 128,015(2seg), 8,294 track (3seg) 3,468 track (nseg>=4) –Too large amount of nseg<=3 To reduce junk track, I applied 30mrad angular much for nseg<=3 tracks Reduced to 37,125(2seg), 1,475(3seg) 66394 f001.001 100730 f002.001 335458 f003.001 232095 f004.001 286247 f005.001 404625 f006.001 314017 f007.001 172725 f008.001 110706 f009.001 100512 f010.001 85604 f011.001 106800 f012.001 116955 f013.001 137667 f014.001 119846 f015.001 142189 f016.001 127642 f017.001 135839 f018.001 141562 f019.001 126336 f020.001 166530 f021.001 3530479 total

15. 4 segment or more track

16. 2 segment track3 segment track

17. Efficiency check ECFSAL reconstructed tracks nseg>=4 is used. –Fully overlapped scanning area 4x4 is used. –Start and end plate is not used for eff check. –Plate 1 and 21 eff. Can not check check

19. 6.3mrad6.4mrad Note:angle is compared with angle obtained by position of start and end. 5.4  m6.0  m

20. Eff. As a function of slope Eff. As a function of plate

21. PH distributionTrack density

22. Preliminary vertex hunting ECVTXA is used for preliminary vertex hunting. 11 6 0 -56561.9 76531.2 -20969.1 151 5941653 9 141 7118239 5 1.8 -7.2 -46.6 -1149.9 7.03 0.1931 141 7070732 7 151 5941653 9 -7.1 -12.1 27.9 -1075.3 12.83 0.1179 151 5941653 9 151 5981499 7 -3.2 4.7 -26.7 -1129.9 0.98 0.2085 141 7070732 7 151 5981482 6 1.7 -7.2 -0.2 -1103.5 13.39 0.2461 151 5941653 9 151 5981482 6 -2.2 5.6 -32.9 -1136.2 1.99 0.1440 151 5981482 6 151 5981499 7 -1.9 4.5 -6.6 -1109.9 0.05 0.0767 141 7118239 5 151 5981482 6 -1.0 -5.3 53.4 -1049.9 8.63 0.0695 151 5979255 6 151 5981499 7 -5.0 2.3 -4.3 -1107.6 7.78 0.4589 151 5979255 6 151 5981482 6 -4.7 1.7 -2.2 -1105.5 7.52 0.4606 151 5941653 9 151 5979255 6 -7.2 1.4 -4.3 -1107.5 3.24 0.5722 141 7070732 7 141 7118239 5 4.5 -14.9 -35.0 -2370.3 8.35 0.3018 151 5941653 9 9 6 0 -56719.7 76458.9 -19865.9 -0.1384 -0.0688 -1103.2 6.01 0.0056 141 7118239 5 8 7 0 -56435.4 76458.8 -18633.8 0.0521 -0.0259 -2335.4 15.32 0.0052 141 7070732 7 8 7 0 -57120.7 76205.2 -18633.8 -0.2309 -0.1333 -2335.4 23.83 0.0036 151 5981499 7 7 6 2 -56485.4 76495.1 -19865.9 0.0633 -0.0351 -1103.2 6.57 0.0065 151 5981482 6 7 6 2 -56555.2 76446.0 -19865.9 0.0066 -0.0814 -1103.2 4.56 0.0056 151 5979255 6 7 3 8 -56189.2 76008.7 -19865.9 0.3437 -0.4720 -1103.2 7.64 0.0010 3 3 0 -68817.8 47444.7 -22457.2 161 5359881 14 151 2935076 4 1.9 -3.9 2.5 -1388.3 4.33 0.2893 161 5359426 7 151 2935076 4 2.2 -9.6 -25.2 -1416.0 14.66 0.0634 161 5359881 14 161 5359426 7 -0.4 0.7 -10.7 -1401.6 0.21 0.2969 161 5359881 14 16 5 0 -68562.0 47525.6 -21066.4 0.1840 0.0556 -1390.8 3.70 0.0005 151 2935076 4 4 6 11 -69042.4 47305.5 -19865.9 -0.0876 -0.0519 -2591.3 5.53 0.0008 161 5359426 7 10 5 6 -68908.7 47288.0 -21066.4 -0.0652 -0.1134 -1390.8 0.44 0.0010 Another 23 two track vertex IP<20 is exist. Local alignment is not done.

23. Summary Apart from OPERA, NetScan is good method to perform non-bias neutrino interaction analysis. –Especially for electron neutrino location. NetScan with SUTS is feasible. –But, currently noise track density is bit too high to do clean analysis.SUTS scanning should be well tuned. –Also, cut applied for base track is too tight.Should be revised.

24. Outlook Before OPERA run, SUTS can be used for PEANUT analysis(half year) –While in this half year, number of SUTS will increase to 5. –At least, four bricks which exposed more than two month can be scanned by NetScan.(~1,000 neutrino interactions)