1. CSd scanning report from LNGS Nagoya OPERA workshop January 22 nd, 2008

2. Extraction summary Rehearsal with cosmic rays: –Total number of passing through muons: 15 –Muons assigned to Europe: 8 1 st extraction –Total number of extracted events: 7 CC + 2 NC –Events assigned to Europe: 4 CC + 1 NC 2 nd extraction: –Total number of extracted events: 8 CC + 6 NC –Events assigned to Europe: 3 CC + 3 NC 3 rd extraction –Total number of extracted events: 9 CC –Events assigned to Europe: 5 CC 4 th extraction –Total number of extracted events: 5 CC + 1 NC –Events assigned to Europe: 3 CC Total of event assigned to Europe: 8 events from cosmic rays 19 events during the beam exposure For CS and brick handling and booking refer to http://www.bo.infn.it/opera/restricted/BrickTracer/BrickTracer.htm http://141.108.7.20/operaweb

3. Cosmic rays rehearsal From this run we learnt that the fading effect is not affecting our emulsion on the scale of 3  4 months

4. Extraction 1, TT-CS residuals EventBrickDifference from Predicted slope Difference from predicted position (mm) FOG (CS1 CS2) Area (mm 2 ) CSD @LNGS CommentsBrick location 180400976 CC53706-0.006 0.006 -0.084 0.004 -61 16 (K) -13 10 (L) 40x40FOUND (4/4) + 3 TRACKS (4/4) Bari 179673325 CC45540.009 -0.043-7 752x50FOUND (4/4)Napoli 178969961 CC225300.036 -0.000 0.018 -0.000 31 -7 (K) 34 -8 (L) 92x78FOUND (4/4) + 9 OTHER (4/4) Salerno 173520769 CC2937460x72NOT FOUND 2935131 78 (K) 31 75 (L) 116x903 OTHER (4/4)Bologna 179312944 NC11847-49 8 -43 11 -55 1.3 -51 3 -22 -12 -49 +8 116x903 FOUND (4/4) 3 FOUND (3/4) No BMSBern 11845116x90Scanned 11669116x90Scanned 12865116x90Scanned 8954116x90Scanned

5. Extraction 2, TT-CS residuals EventBrickDifference from Predicted slope Difference from predicted position (mm) FOG (CS1 CS2) Area (mm 2 ) CSD @LNGS CommentsBrick location 181155406 CC604813.5 14 72x53NOT FOUND (4/4)High bkg processing Napoli VETO 594920NOT SCANNED Brick upstream* 182574530 CC980>25NOT SCANNED Salerno VETO 187375856 CC5083431 -85.5 7 32x42.51 OTHER (4/4)No BMS Marginal X Edge measure Napoli 508335.9 6.9 NOT SCANNED Adjacent brick* ???After brick analysis Ext last week 181089297 NC43186NC-42 -45.7 6.0 116x901 FOUND (4/4)Napoli 182802454 NC22493NC 6 4 -2.5 11 6.3 6.4 116x902 FOUND (3/4)Bari 183545620 NC47334NC0 0.36.8 5.8 116x906 FOUND (4/4)Bern * only two X ray marks

6. Extraction 3, TT-CS residuals EventBrickDifference from Predicted slope Difference from predicted position (mm) FOG (CS1 CS2) Area (mm 2 ) CSD @LNGS CommentsBrick location 186970035 CC16215-0.036 -0.021 (K) -0.037 -0.105 (L) -38 -21 (K) -8 -8 (L) 6.3 5.4 72x43FOUND (4/4) + 1 OTHER (4/4) Lyon 182351263 CC53024-0.033 0.014 (K) -0.043 -0.016 (L) 56 0 (L)4.2 4.7 64x70 112x84 1 COSMIC (4/4) 3 TRACKS (4/4) No BMS measure Edge measure 2 nd measure Lyon 531024.7 4.4 116x90NOT FOUNDBrick downstream 181851826 CC324625.4 5.3 52x36Marginal in y,x No BMS measure Edge measure ???Adjacent brick Ext last week 180718369 CC3469812.5 10 116x901 COSMIC (4/4)treated as NC No BMS measure ???Ext last week 187056662 CC114847 6.9 120x36NOT FOUND 117898.2 8.0 110x84NOT FOUNDBrick downstream prob = 0.10 Only 2 mark on CS ???Ext last week

7. Extraction 4, TT-CS residuals EventBrickDifference from Predicted slope Difference from predicted position (mm) FOG (CS1 CS2) Area (mm 2 ) CSD @LNGS CommentsBrick location 191825714 CC157280.078 0.045 (K) -0.117 0.053 (L) -2.5 -5.4 (K) 9.5 -2.4 (L) 6.2 6.1 72x39FOUND (4/4)Large difference K-L Last but one wall Salerno 191951129 CC146212.8 -6.2 (K) -10 -9 (L) 6.1 6.2 52x541 OTHER (4/4)Marginal X Edge measure Bern 192062015 CC326296 13 (K) 17 11 (L) 6.0 5.5 72x66 60x40 FOUND (4/4) + 3 OTHER (4/4) + 1 COSMIC (4/4) 2 nd measure to locate the muon Bologna

8. Special procedure for marginal events No adhesive tape with manual operations No vacuum 4 CSd have been treated: –50834 –53024 –32462 –14621 Basically the whole emulsion surface was scanned No other tracks found

9. Some plots (brick 14621, 32462)

10. Pending events High fog CS doublets Ev 182574530 –Br 980: high fog CS doublet (Salerno + VETO) Ev 181155406 –Br 6048: relatively high fog CS doublet, scanned but high bkg (Napoli + VETO) –Br 5949: fog>20, not scan-able Event that needs a further analysis after brick scanning Ev 187375856 –Br 50834: found one track not compatible with muon, new brick extracted last week Events not yet located, new brick extracted last week Ev 187056662 –Br 11484: not found –Br 11789: prob = 10%, brick downstream, not found Ev 181851826: –Br 32462: marginal in X Ev 180718369: –Br 34698: treated as NC, not found Event not found in the brick Ev 179312944 –Br 11847: it seems that there is non correspondence between bricks and CS??? Ev 191951129: –Br 14621: one good track (not the muon) not located in the brick

11. Event 187056662

12. Due to the strong backscattering activity, the wall finding selected W18 However, wall 19 was assigned 10% probability Ev 187056662 - brick 11484 Now we are going to scan the 3 rd brick, waiting to be extracted W18 R9 C07

13. Event 181851826

14. Event 181851826 1st brick 0.58 SM Wall, side, row, cell 1 23 -1 27 24 Event 181851826 0.31 SM Wall, side, row, cell 1 22 -1 27 24 Class 1:Marginal in y,x Event 181851826 – brick 32462

15. Event 180718369

16. Ev 180718369 - brick 34698

17. Force the muon Id respectively for the first and second muon and perform BF 1)First muon (track 0, red) Event 180718369 1st brick 0.93 SM Wall, side, row, cell 1 23 -1 32 12 Brick N., status 1058501 0 Kalman: slopes X,Y 0.0046609398 0.152361006 K: Extrapolation -183.813553 -53.3549576 -481.819092 K: dist. from borders evt x,y mm class 180718369 43.1945801 15.9143066 2 K: Coordinates in emu. frame x,y mm 81.9055176 15.9143066 Linear slopes X,Y 0.00623236783 0.141633734 Linear extrap X,Y,Z -183.870834 -52.9445305 -481.819092 Linear coordinates in emu. frame x,y mm 81.3327637 20.0185547 2) Second muon (track 5, green) Event 180718369 1st brick 0.93 SM Wall, side, row, cell 1 23 -1 31 13 Brick N., status 1034698 0 Kalman: slopes X,Y 0.00277441996 -0.00806306954 K: Extrapolation -173.189819 -60.9103775 -481.819092 K: dist. from borders evt x,y mm class 180718369 57.8574219 45.6601562 3 K: Coordinates in emu. frame x,y mm 67.2426758 45.6601562 Linear slopes X,Y 0.0060407836 -0.00135052588 Linear extrap X,Y,Z -173.30423 -61.0473633 -481.819092 Linear coordinates in emu. frame x,y mm 66.0986328 44.2902832 Two bricks selected take « cum grano salis » for the systematics, I would give preference to SM Wall, side, row, cell 1 23 -1 31 13, the track looks better reconstructed NEW Dario @ BFCS Meeting 18 Oct 2007

18. Analysis with the second muon  SM Wall, side, row, cell 1 23 -1 31 13 So we asked to extract the brick W23, R30, C13

19. Event exchange Event exchange will allow us to make a rehearsal –Quite large sample –Tight schedule However the analysis is not completed –Some CS pending –Scan-forth from brick to CS The proposal is to postpone for one months in order to complete the analysis (end of February)

20. Backup slides

21. Event 179312944, brick 11847

23. Event 179312944, brick 11847 CS1-CS2 residuals Automatic measurement Manual IDSXSYN1N2 DX (  m)DY (  m) DSXDSY DX (  m)DY (  m) DSXDSY 10.3940.0591923-7.51.4-0.0030.002 20.262-0.1772123-1.35.1-0.018-0.014 3-0.255-0.2211820-5.1-2.00.0400.039 4-0.168-0.13323131.10.90.0110.026-0.5-0.1-0.002-0.001 50.2820.4551223-1.6-14.4-0.024-0.0373.7-38.50.001-0.018 6-0.0850.0791219-1.71.1-0.006-0.0366.8-30.60.003-0.022 A new measurement is performed that confirmed candidate 1 Candidate 2 was discarded because of the cut on  slope_trans Candidate 3 was discarded because of the cut on  slope_long Further from the 3 out of 4 search: Candidate 4 is a very good candidate Candidate 5 – 6 are less good, even candidate 6 seems not correlated

24. Event 182351263 – brick 53024

25. Ev 182351263

26. Data quality CS event related track hunting is different job w.r.t cosmic track hunting: –Event topology (QE, NC, CC, big shower events) –Scanning time –Background level –Event multiplicity Most of our effort was devoted to event location in CS Now we need to digest the big amount of data and present a data quality analysis