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

Status of event location TOTALCCNCBLACK CS Received events Received bricks Valid events Analyzed events

Status of event location TOTALCCNCBLACK CS Located in ECC Located in dead material 211- Passing through 7521 Analysis completed Connected Pending Scanning now 22-2

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

Vertex position Plate number

Prong multiplicity TOTAL CCNC

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

Interesting topologies Event no located in brick Event no located in brick (NEW) Event no located in brick (NEW)

top view beam view mu side view I.P. w.r.t. the vertex trk  m trk  m trk  m (mu) mu mu momentum in spectrometer: 17.2 GeV/c decay Pt > 5 GeV

(p22-56 used) daughter angle and momentum trk145: TX: TY: P = GeV/c trk206: TX: TY: P = GeV/c using these values estimate the mass of the D0 using 3 possibilities for daughters: -Kaon-Pion: 1.26 GeV ( ) -Pion-Kaon: 1.30 GeV ( ) -Pion-Pion: 1.09 GeV ( ) -these values are below the D0 mass (1.864 GeV). -Problably a neutral is missing (also according to the topology).

Muon angle: KALMAN LINEAR

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: Secondary vertex: ID X Y Z TX TY IP mu momentum 3.7 Gev/c (TT) // 10.0 wrt 1ry // 5.6 wrt 1ry All the tracks have been measured in the first plate downstream the primary vertex. IP distribution

79117

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

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)

id3 id2 id1(mu) id8 id10 Hypothesis (1) 1ry vtx + short vee (daughters: id 3 and id 2) 1ry ( ) id IP wrt 1ry = 0.2 (mu) id IP wrt 1ry = 2.2 id IP wrt 1ry = 6.5 (gray) id IP wrt 1ry = 9.4 (~0.4 GeV) short vee ( ) id IP wrt vee = 0.3 IP wrt 1ry = 9.4 id IP wrt vee = 0.6 IP wrt 1ry =111.8 Beam view Δz = 599  m

id3 id2 id1(mu) id10 Hypothesis (2) 1ry vertex + short kink (daughter: id 3) 1ry ( ) id IP wrt 1ry = 4.3 (mu) id IP wrt 1ry = 8.0 id IP wrt 1ry = 3.2 id IP wrt 1ry = 15.8 (gray) id IP wrt 1ry = 12.3 (~0.4 GeV) short kink daughter id IP wrt 1ry =122.7 min. kink angle Beam view

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 ( ) GeV pi-K : 1.6 ( ) GeV pi-pi : 1.4 ( ) GeV K -pi : 1.5 ( ) GeV

Event in 87219: CC or NC?  angle: Kalman Linear  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.: Tracks angle and IP

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”

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 bricks/week ( in total) We are ready for the 2x of the 2009 run!