1. OPERA 2008 run: a report from the Swiss scanning lab Ciro Pistillo LHEP Bern university for the Swiss scanning team OPERA Collaboration meeting Ankara, April 1-4 2009

2. Status of event location TOTALCCNCBLACK CS Received events 1261052111 Received bricks 1271062111 Valid events 1241051910 Analyzed events 122103198

3. Status of event location TOTALCCNCBLACK CS Located in ECC 10187144 Located in dead material 211- Passing through 7521 Analysis completed 11093174 Connected11596195 Pending121023 Scanning now 22-2

4. Status of publication Bricks: 85 / 101 published in central DB Vertices: 78 / 101 published in central DB

5. Vertex position Plate number

6. Prong multiplicity TOTAL CCNC

7. Impact parameter IP (not mu) Δz < 1300 IP (mu) IP < 10  m large angle black tracks IP (not mu)

8. Interesting topologies Event no. 231012915 located in brick 72853 Event no. 228197639 located in brick 14653 (NEW) Event no. 228563573 located in brick 79117 (NEW)

9. top view beam view mu side view I.P. w.r.t. the vertex trk 145 0.3563 0.1562 0.5  m trk 206 -0.2815 -0.2423 0.4  m trk 541 -0.0001 0.0303 62.8  m (mu) 145 541 mu 72853 mu momentum in spectrometer: 17.2 GeV/c decay Pt > 5 GeV

10. (p22-56 used) daughter angle and momentum trk145: TX: 0.3519 TY: 0.1485 P = 1.685 -0.447 + 0.951 GeV/c trk206: TX:-0.2698 TY:-0.2425 P = 1.323 -0.351 + 0.747 GeV/c using these values estimate the mass of the D0 using 3 possibilities for daughters: -Kaon-Pion: 1.26 GeV (+0.52 -0.23) -Pion-Kaon: 1.30 GeV (+0.52 -0.22) -Pion-Pion: 1.09 GeV (+0.58 -0.27) -these values are below the D0 mass (1.864 GeV). -Problably a neutral is missing (also according to the topology).

11. Muon angle: KALMAN 0.150 0.305 LINEAR 0.144 0.303 14653

12. ΔZ = 51  m 8 prong vertex or very short decay? Vertex located in the lead upstream the plate 51 kinematical analysis not possible (downstream brick extracted)

13. Primary vertex: 59711.0 54774.6 -8818.2 Secondary vertex: 59707.3 54769.4 -8767.2 ID X Y Z TX TY IP 1 59835.3 55044.4 -8085.4 0.1684 0.3739 4.2 mu momentum 3.7 Gev/c (TT) 2 59607.9 54880.4 -8085.4 -0.1433 0.1437 2.0 3 59514.8 54836.6 -8085.4 -0.2635 0.0789 5.1 4 59898.8 54731.1 -8085.4 0.2570 -0.0548 3.4 5 59535.8 54453.7 -8085.4 -0.2349 -0.4370 3.0 6 59607.2 54412.4 -8085.4 -0.1444 -0.4977 2.9 7 59731.5 54812.4 -8085.4 0.0356 0.0628 0.3 // 10.0 wrt 1ry 8 59624.4 54752.8 -8085.4 -0.1222 -0.0233 0.8 // 5.6 wrt 1ry All the tracks have been measured in the first plate downstream the primary vertex. IP distribution

14. 79117

15. pl 33: 1ry vertex + short charm candidate secondary interaction

16. id 8 found in single BT search (low mom, gray) id 1 mu (not found in CS) id 7 CS pred id10 CS pred id 2 id 3 CS pred id 5 found in single BT search (low mom)

17. id3 id2 id1(mu) id8 id10 Hypothesis (1) 1ry vtx + short vee (daughters: id 3 and id 2) 1ry (103979.1 45758.9 -32325.8) id 1 -0.0318 0.0911 IP wrt 1ry = 0.2 (mu) id10 0.1998 0.2805 IP wrt 1ry = 2.2 id 8 0.3420 -0.0740 IP wrt 1ry = 6.5 (gray) id 5 -0.1709 0.0289 IP wrt 1ry = 9.4 (~0.4 GeV) short vee (103933.6 45782.1 -31727.2) id 2 -0.0685 0.0530 IP wrt vee = 0.3 IP wrt 1ry = 9.4 id 3 0.0050 -0.1310 IP wrt vee = 0.6 IP wrt 1ry =111.8 Beam view Δz = 599  m

18. id3 id2 id1(mu) id10 Hypothesis (2) 1ry vertex + short kink (daughter: id 3) 1ry (103979.1 45758.9 -32325.8) id 1 -0.0318 0.0911 IP wrt 1ry = 4.3 (mu) id10 0.1998 0.2805 IP wrt 1ry = 8.0 id 2 -0.0685 0.0530 IP wrt 1ry = 3.2 id 8 0.3420 -0.0740 IP wrt 1ry = 15.8 (gray) id 5 -0.1709 0.0289 IP wrt 1ry = 12.3 (~0.4 GeV) short kink daughter id 3 0.0050 -0.1310 IP wrt 1ry =122.7 min. kink angle 0.158 Beam view

19. Result of momentum measurement (preliminary) id 1 p = 17.0 GeV/c (TT) id10 p = 4.0 (-2.3,+14.4) GeV/c (90%CL) (pl 33-56) id 2 p = 8.8 (-5.5,+21.4) GeV/c (90%CL) (pl 33-53) id 3 p = 5.5 (-3.8,+10.2) GeV/c (90%CL) (pl 33-56) id 5 p = 0.4 (-0.3, +1.3) GeV/c (90%CL) (pl 33-39) id 8 gray, not reconstructed Invariant mass (tracks 2 and 3) K -K : 1.7 (+1.4 -0.4) GeV pi-K : 1.6 (+1.5 -0.4) GeV pi-pi : 1.4 (+1.5 -0.5) GeV K -pi : 1.5 (+1.5 -0.4) GeV

20. Event 234676119 in 87219: CC or NC?  angle: Kalman -0.110 -0.092 Linear -0.114 -0.063  momentum: 0.87 GeV/c

21.  not found in CS and not found at the primary vertex should we consider it as a NC? VTX POS.: 20206.70 32517.10 -12668.10 Tracks angle and IP 0.0285 -0.0179 0.00 -0.3662 0.1468 3.80 -0.0367 0.5623 9.00

22. 127 Jul08 Jan09Sep08 Apr09 10 bricks/week 5.3 bricks/week Received bricks Scanning capability for 2009 RUN 15 bricks/week (max) 12 bricks/week (steady) (only location) 10 bricks/week (steady) (including 20% SF and ex.tot.) “only location” includes charm search: TS of 10 plates downstream Including: ScanForth done for all the located events Extendend TotalScan 20 plates downstream the primary vertex (~50% of the events) Scanning load is twice wrt “only location”

23. Conclusions 124 events received Analysis successfully completed for 110 events 101 neutrino interactions located in the ECC 3 charm candidates Focus now on charm search: check stopping tracks with large IP wrt to the vertex Scanning capability 10-15 bricks/week (500-750 in total) We are ready for the 2x of the 2009 run!