1. Bari emulsion lab: status report
● Hardware and software
● Event location
● Decay search
● Brick exchange
● Lab organization
OPERA Emulsion Scanning Meeting, Cetara, 13 September 2010

2. Hardware and Software 3 microscopes (oil objective)
2 microscopes equipped with TecnoCut Plate Changers (in tape configuration)
used for scanning (all films currently being glued)
1 microscope used for the scanning of not glued films (a few bricks)
Software: Chrysalis Momentum (with ScanGrid)
 upgrade to Cuba Libre foreseen before the
end of the year
in parallel with foreseen stop for the installation
of final DB storage array (?)

3. Analysis not possible (HF/Bad quality bricks)
Event location
RUN 2008 CC NC
Total
Events 98 19
117
Analysis not possible (HF/Bad quality bricks) 2
Scanning started 92 17
109
CS to Brick ok 80 14 94
Located  interactions 71 10 81
 interactions in dead material 1
Passing-through
New brick requested 3
CS re-analysis requested 6 8

4. Run 2008 location summary 117 events (130 bricks)
Location fraction : 0.71  0.04 %
Location efficiency (started bricks):  %
located interactions (2 NC single hadron stops)
6 events not yet measured
pending events
3 new bricks never delivered (events CC, CC, CC)

5. Analysis not possible + Poor events
RUN 2009 CC NC
Total
Assigned events (bricks)
114 30
144 (154)
Delivered events
106 26
132
Analysis not possible + Poor events 3
1 + 1
4 + 1
Scanning started 99 20
119
CS to Brick ok 90 17
107
Scanning completed 9 1 10
Located  interactions 61 11 72
 interactions in dead material 4 5
Passing-through
New brick requested
CS re-analysis requested 6

6. RUN 2010 CC NC Total Assigned events 5 1 6 Delivered events
Analysis not possible
Scanning started
CS to Brick ok
Scanning completed
Located  interactions
 interactions in dead material
Passing-through
New brick requested
CS re-analysis requested

7. Decay search CC NC Total Located 2008 + 2009 (ECC) 132 21 153
7 + 4
Brick
Run
Event type
65097
2008
CC, charm candidate
13058
NC, hadronic interaction
10010
CC, hadronic interaction
137454
2009
118858

8. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
Standard reconstruction
▪ Primary vertex with 8 prongs
(lead plate between films 28 and 29)
▪ Secondary vertex with 5 prongs
(neutral parent)
▪ One primary track clearly pointing
to secondary vertex

9. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
Track SX SY
I.P. (m)
419
-0.011
0.011
5.0
741
0.110
0.176
9.5
423
-0.030
0.069
6.7
485
-0.192
0.288
3.2
746 muon
0.075
-0.069
1.1
490
-0.217
0.194
195
-0.350
0.168
12.5
374
(-0.082)
(-0.309)
 (top micro only)
After visual inspection
▪ Primary vertex with 8 prongs (1 ) confirmed
in lead plate between films 28 and 29,
depth ~ 875 m

10. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
Bologna
Bari
Napoli
TX TY IP
out of acceptance
extra track to be confirmed in 29
( ) top micro, 
passing-through?
TX TY IP
not found

11. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
After visual inspection
▪ Secondary vertex:
track 1054 (SB) starts in film 32
tracks 759 and 750 are ’s, film 32
track 830 starts in film 33
track 839 is a , film 34
track 830 starts in film 33
track 839 is a , film 34
disconnected from vertex

12. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
After visual inspection
▪ Primary vertex with 8 prongs (1 ) confirmed
in lead plate between films 28 and 29,
depth ~ 875 m
▪ Secondary vertex in lead plate between
films 31 and 32, kink topology + gammas,
parent track 419

13. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
After extra-track search
▪ 4 additional tracks selected
Not done:
study of extra-tracks
follow-down of all tracks

14. Brick exchange PRELIMINARY! Event 234276347 Brick 44354 (Napoli)
Daughter particle:
P = 0.94 [0.69, 1.48] GeV/c
kink angle: 224mrad
Pt = 0.21 [0.15, 0.33] GeV/c

15. Lab organization List of priorities: ● Completion of DS 2008
Scanning of 2009 bricks
Start of DS 2009 (located events)
● Re-start of 2009 location
DS 2009
Start of 2010 scanning
● Pending events (2008, 2009)
Aim: reach a steady-state operation
with event reconstruction and analysis
performed at the same time