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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. Status of event location. Status of event location. Status of publication. Bricks:

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Opera 2008 run a report from the swiss scanning lab

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




Status of publication

Bricks:

85 / 101 published in central DB

Vertices:

78 / 101 published in central DB


Vertex position

Plate number


Prong multiplicity

TOTAL

CC

NC


Impact parameter

IP (mu)

IP < 10 m

IP (not mu) Δz < 1300

IP (not mu)

IP < 10 m

large angle black tracks


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)


side view

72853

top view

145

mu

mu

541

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)

beam view

mu

mu momentum in spectrometer: 17.2 GeV/c

decay Pt > 5 GeV


  • (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).


14653

Muon angle: KALMAN 0.150 0.305

LINEAR 0.144 0.303


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)


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

IP distribution

All the tracks have been measured in the first plate downstream the primary vertex.




id10 CS pred

id 5 found in single BT search (low mom)

id 8 found in single BT search (low mom, gray)

id 1 mu (not found in CS)

id 2

id 3 CS pred

id 7 CS pred


Beam view

id1(mu)

id10

id8

id2

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

id3

Δz = 599 m


Beam view

id10

id1(mu)

id2

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

id3


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


Event 234676119 in 87219: CC or NC?

 angle: Kalman -0.110 -0.092

Linear -0.114 -0.063

 momentum: 0.87 GeV/c


 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


127

Received bricks

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”

10 bricks/week

5.3 bricks/week

Apr09

Jul08

Sep08

Jan09

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


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!


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