Download - EMC Software and analysis update
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Alexandre A. P. Suaide
Slide 1STAR Collab. Meeting, E. Lansing, Aug 2003
EMC Software and analysis updateEMC Software and analysis update
• Update on EMC– News from
last run– Calibrations– Status of data
analysis• Software update
– Offline software
– Online software
– Task list and service work
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Alexandre A. P. Suaide
Slide 2STAR Collab. Meeting, E. Lansing, Aug 2003
What worked during the last runWhat worked during the last run
• Towers– About 100/2400 dead or
noisy• 1 bad digitizer board
(32) channels (replaced)• 68 noisy/dead channels• HV is set to zero for all
of them
• SMD– 3/60 modules not
working– Some individual
channels• Some we know are dead
– Zero pedestal and no readout
• Some are noisy
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Alexandre A. P. Suaide
Slide 3STAR Collab. Meeting, E. Lansing, Aug 2003
Bad runs/daysBad runs/days
• About 138 bad runs– Thanks to Weijiang Dong– List at ~suaide/badruns/2003.h
Weijiang Dong
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Alexandre A. P. Suaide
Slide 4STAR Collab. Meeting, E. Lansing, Aug 2003
NoiseNoise• There is a correlated noise between towers very common to
calorimeters– Pedestal distribution has a width ob ~25 GeV that can be easly reduced to ~5-6 GeV using standard comon noise subtraction methods
• The Energy dynamic range of EMC is 2400 towers*60 GeV = 144 TeV– Noise at 1:104 level
S. Trentalange
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Alexandre A. P. Suaide
Slide 5STAR Collab. Meeting, E. Lansing, Aug 2003
BEMC Calibration BEMC Calibration
• Detector is calibrated using MIP peak method– Electron calibration
is under way
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Alexandre A. P. Suaide
Slide 6STAR Collab. Meeting, E. Lansing, Aug 2003
ET measurement in Au+Au collisionsET measurement in Au+Au collisions
• Paper (PRC) being reviewed in the high-pT PWG
M. M. de Moura
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Alexandre A. P. Suaide
Slide 7STAR Collab. Meeting, E. Lansing, Aug 2003
Electron identification in d+AuElectron identification in d+Au
• Use TPC dE/dX to pre-select electrons in the range of 1.5 < p < 5.0 GeV/c (can extend a little more)
• Compare TPC momentum with tower energy (p/Etower)
p/Etower p/Etower
dis
tan
ce
Distance < 0.015
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Alexandre A. P. Suaide
Slide 8STAR Collab. Meeting, E. Lansing, Aug 2003
Comparison with Au+AuComparison with Au+Au• Electron peak is wider than Au+Au
– Lower multiplicity in d+Au makes tower equalization more difficult -> working on it
• Current tower resolution ~ 21%/sqrt(E)
d+Au
p/Etower
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Alexandre A. P. Suaide
Slide 9STAR Collab. Meeting, E. Lansing, Aug 2003
The SMD can enhance e/h discriminationThe SMD can enhance e/h discrimination
• SMD can help to discriminate electrons from hadrons– Most of hadrons do not have SMD clusters– The distance between SMD and track has different
distributions
Hadroncandidates
Electron candidates
Distance SMD-track
NO SMD
SMD-
SMD-
BOTH
type
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Alexandre A. P. Suaide
Slide 10STAR Collab. Meeting, E. Lansing, Aug 2003
Preliminary single electron spectra for d+Au collisionsPreliminary single electron spectra for d+Au collisions
• 950 k High-tower events
• No corrections applied– Trigger bias– Efficiency– background – Momentum
resolution, etc• Need to tune up
electron identification with EMC
(e+ + e- )/2
pT (GeV/c)
Single electron spectrum for HT d+Au collisions
HT1HT2
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Alexandre A. P. Suaide
Slide 11STAR Collab. Meeting, E. Lansing, Aug 2003
0 mass reconstruction in d+Au0 mass reconstruction in d+Au S. Trentalangeand S. Guertin
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Alexandre A. P. Suaide
Slide 12STAR Collab. Meeting, E. Lansing, Aug 2003
0 reconstruction in d+Au – SMD information0 reconstruction in d+Au – SMD information
• SMD is used to get the photon position– Need to understand
efficiencies– Look how many EMC
points at given energy have SMD info on it
– Efficiency drops at lower energies because SMD thresholds are very high at reconstruction software
• Need tune up
S. Trentalangeand S. Guertin
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Alexandre A. P. Suaide
Slide 13STAR Collab. Meeting, E. Lansing, Aug 2003
0 spectrum in d+Au 0 spectrum in d+Au
• Much work to be done– Efficiency
corrections (embedding)
– Cluster thresholds
• This may have huge difference at high-pt because of the very small opening angle between photons
S. Trentalangeand S. Guertin
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Alexandre A. P. Suaide
Slide 14STAR Collab. Meeting, E. Lansing, Aug 2003
High tower azimuthal correlationsHigh tower azimuthal correlations
• Most of high tower triggered events with no tracks pointing to the tower come from 0´s– HT-track correlations
and HT-HT correlations is a good way to study 0-track and 0-0 correlations
• It is possible to go very high in pT because of trigger
• Very preliminary work. Need to compare to minimum bias
S. Chattopadhyay, S. Voloshinand A. Suaide
trackpT
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Alexandre A. P. Suaide
Slide 15STAR Collab. Meeting, E. Lansing, Aug 2003
EMC Software statusEMC Software status
• Offline reconstruction chain is fully implemented
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Alexandre A. P. Suaide
Slide 16STAR Collab. Meeting, E. Lansing, Aug 2003
EMC DatabaseEMC Database
• Calibration and pedestals are filled in the database– Only MIP calibration for a while– Pedestals were saved every 12 hours during
beam time
• Status tables– Only one table with the bad towers/SMD
channels in the beggining of the run– Bad runs at ~suaide/badruns/2003.h
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Alexandre A. P. Suaide
Slide 17STAR Collab. Meeting, E. Lansing, Aug 2003
EMC simulations and embeddingEMC simulations and embedding
• Slow simulator (PLEASE USE ONLY Y2003a GEOMETRY)– Real gains, pedestal
and map of dead channels from database
– Geometry propagation to .geant.root -> Is there any hope???
• Embedding (2 steps)– TPC embedding– EMC embedding
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Alexandre A. P. Suaide
Slide 18STAR Collab. Meeting, E. Lansing, Aug 2003
Online software – preparation for next runOnline software – preparation for next run
• Online calibration and pedestal measurement– Software is ready – Pedestal measurement,
tower equalization and MIP calibration with L3 tracks
• Need to tune up parameters – Multiplicity cuts, time interval for pedestal
calculation
• Event display– Ready to go
• Online monitoring– EMC Monitoring – ready– STAR online monitoring (Panitkin’s) – ready– Need to check for possible changes in the
trigger map and event pool library
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Alexandre A. P. Suaide
Slide 19STAR Collab. Meeting, E. Lansing, Aug 2003
Software summary – task list and service workSoftware summary – task list and service work• Simulations
– Trigger simulator (very high priority)• Implementation of current High Tower and Patch
algorithms – Signed but nothing has been done. NEED PEOPLE???
– Slow simulator (moderate priority)• Include simulation of correlated noise
– Signed but nothing has been done. NEED PEOPLE???
– Embedding• Turn on EMC real data processing (very high
priority)– Signed. Small problem with timestamp. Working on
a solution
• Test StEmcMixerMaker (very high priority)– DONE with simulation alone. Need to wait for
previous item to be fixed
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Alexandre A. P. Suaide
Slide 20STAR Collab. Meeting, E. Lansing, Aug 2003
Software summary – task list and service work (cont.)Software summary – task list and service work (cont.)
• Calibration– Electron calibration (very high priority)
• Under way. Working on better tower equalization– SMD calibration
• NEED PEOPLE HERE• Database
– Status tables (extremely high priority)• Map dead/bad towers and SMD channels• Time dependence of bad channels• NEED PEOPLE HERE
• Online Software – Check software for next run (moderate
priority)• Recompile with newer libraries• Check for possible changes in the event pool library
and possible changes in the trigger maps• NEED PEOPLE HERE
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Alexandre A. P. Suaide
Slide 21STAR Collab. Meeting, E. Lansing, Aug 2003
Final commentsFinal comments
• Data analysis is progressing very well (QM2004????)– ET paper being reviewed in the high-pT PWG
– Single electron spectrum– 0 spectrum and correlations
• Software development– All pieces in place– Task list
• Offline -> Simulations, embedding, map dead channels, etc.
• Online -> Need to prepare for next run• NEED VOLUNTEERS THAT ARE REALLY COMMITED
TO HELP