Status of the OPERA Neutrino Oscillation Experiment 6-8 January 2010, Cracow, Poland Sergey Dmitrievsky Joint Institute for Nuclear Research, Dubna on behalf of the OPERA Collaboration CRACOW EPIPHANY CONFERENCE On Physics in Underground Laboratories and Its Connection with LHC
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Status of the OPERA Neutrino Oscillation Experiment
Status of the OPERA Neutrino Oscillation Experiment. Sergey Dmitrievsky Joint Institute for Nuclear Research, Dubna on behalf of the OPERA Collaboration. CRACOW EPIPHANY CONFERENCE. On Physics in Underground Laboratories and Its Connection with LHC. 6-8 January 2010, Cracow, Poland. Outline. - PowerPoint PPT Presentation
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Status of the OPERANeutrino Oscillation Experiment
6-8 January 2010, Cracow, Poland
Sergey DmitrievskyJoint Institute for Nuclear Research, Dubna
on behalf of the OPERA Collaboration
CRACOW EPIPHANY CONFERENCEOn Physics in Underground Laboratories and Its Connection with LHC
OutlineOutline
1. About the Experiment2. The OPERA Detector3. Data Analysis4. Present Status of OPERA
Both systems demonstrate:• ~0.3 m spatial resolution• ~2 mrad angular resolution• ~95% base track detection
efficiency
15
ECC
Large area scan~100cm2
Point Scan~100x100m2
Lead
emul
sion
Lead
emul
sion
Lead
emul
sion
Lead
emul
sion
Lead
emul
sion
Lead
emul
sion
Lead
emul
sion
emul
sion
emul
sion
neutrino
CS TT
Decay Search ProcedureDecay Search Procedure
~2 µm
Volume scanning (~2 cm3) around the stopping point
Track Follow-up and Vertex FindingTrack Follow-up and Vertex Finding
test beam
P M
CS (G
eV)
P beam (GeV)
Evaluate scattering of particles
Track follow-up film by film
• alignment using cosmic ray tracks
• definition of the stopping point
IP
Z
emulsionlead
Decay Search: Impact Parameter DistributionDecay Search: Impact Parameter Distribution
Impact parameter of tracks at the primary vertex
2.4 µm on averagerelevant for the decay search
DataDataDataData
MCMC
Located Neutrino InteractionEmulsion gives 3D vector data, giving a micrometric precision of the vertexing accuracy.(The frames correspond to scanning area. Yellow short lines measured tracks. The other colored lines interpolation or extrapolation. The colors indicate the Z-depth in the module.)
1 cm
• Neutral charmed particle decay vertex mistaken as primary vertex in events where only a muon and D0 are produced at primary vertex
τ
Good understanding of charm production is mandatory for/before measurements
Charm EventsCharm Events
Charm topology is analogous to (similar lifetime and mass):
– Reference sample for the tau decay finding efficiency
– It is also important to identify the muon in charm events in order to suppress this background
Topological identification and kinematical confirmation of a charm event
Primary vertex
Decay vertex
2000: approval of the CNGS project2003: start of detector construction2004: end of beam civil engineering
2006: commissioning (empty detector’s target) • 7.6E17 pot2007: short pilot run (40% target) • 8.2E17 pot, 38 ν events in the target2008: 1st physics run • 1.78E19 pot, 1663 ν events in the target, 0.7 ντ expected2009: 2nd physics run • 3.52E19 pot, 3693 ν events in the target, ~2 ντ expected in total1 year CNGS nominal:
4.5E19 pot
Progress of the ExperimentProgress of the Experiment
Unix time
Saturday 30/5/09
pot
PS vacuum leak
10/6 00:00 11/6 1:07
MD
Monday 15/6 8:00
Friday 19/6 8:00
MD + Septum water leak
Tuesday 30/6 8:00
Friday 3/7 7:15
MD
10/8 0:0
13/8 17:24
MD
12/7 1:07
16/7 8:00
MD
31/7
LINAC2 vacuum leak
29/8 20:49
2/9 9:00
MD
26/8
PS magnet
busbar short
3/9 4:23
4/9 22:06
MD 14/9-18/9
MD 22/9-23/9
CNGS ventilation 28/9
PS septum
2/10-11/10
MD 3/11-5/11C
Monday 23/11/09
Foreseen stops
Unforeseen stops
3.522E19 pot
Pot collected during the 2009 CNGS run
Status of event location in Europe for 2009 run
Time
Nb
of
Even
ts
• OPERA successfully operates on the CNGS neutrino beam and have just finished to take data for the 2nd physics year
• CNGS performances improved: 2008+2009 were~ 1 nominal year, 2010 expected as a nominal year
• ~ 1100 interactions have been located till this moment• ~20 charm candidates found: systematic decay search
started with an uniform selection on all the data sample• Analysis of 2009 progressing while completing the
queue of 2008 run• First (s) expected soon in the analysis of 2008/09 runs