Transcript Moore per l'HLT/EF

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MOORE (Muon Object Oriented REconstruction)
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Track reconstruction in the Muon Spectrometer
MuonIdentification
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Reconstruction and Identification of Muons
Divided in two components :
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MuidStandAlone:
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MuidComb:
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Extrapolation of tracks reconstructed by MOORE to the interaction point.
Combination of tracks reconstructed inside the Muon Spectrometer with tracks reconstructed in the Inner
Detector
TrigMoore: Implementation of MOORE/MuID in the framework of High Level
Trigger at the Event Filter stage.
 Wrapped Strategy- Allows to execute the offline reconstruction chain from the
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online environment, reconstructing the event by accessing at all the Spectrometer
data. The implemented chain is composed by Moore and MuidStandAlone.
Seeded Strategy – Uses the hypotesys formed at the previous stage in the trigger
process, accessing only to subdetectors data that are of interest for the selected
trigger regions. (By now only regions selected by the LVL1 trigger have been used).
Moore in HLT- a contact point between offline and online.
Main ideas
The algorithms operating in the High Level Trigger at the Event Filter
stage should not operate only in a general purpose mode
(reconstructing the event in full scan) but should be able to operate
starting from hypothesys formed in the previous stages of the
triggering process.
Avoid the code duplication! Only the seeding has an
``ad hoc’’ implementation for the online environment.
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In the table the average and rms is
calculated on the events left after rejecting
5% of the events included in the high
execution time tail
Seeded: Access only the
RoI from the LVL1
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Atlas pcatr machine (2.4GHz)
OPT build
Timing package: TrigTools/TrigTime
Strategies Seeded/wrapped
Conservative approach (i.e. data access
and data preparation are included)
Wrapped, Full event
Reconstruction
pT
(GeV/c)
<T>
(msec)
rms
(msec)
<T>
(msec)
rms
(msec)
8
73
30
68
30
20
59
15
58
21
50
61
19
58
25
100
61
75
64
26
300
75
23
64
32
DC1 single Muons
execution times
Wrapped strategy |h| < 1.05
Efficiency for the reconstruction of single Muons
sample in wrapped strategy (event scan). This is
equivalent to the execution of the offline version of
the code. The analysis has been restricted to the
barrel region.
Resolution in wrapped and seeded strategy.
Strategy wrapped |h| < 1.05
Strategy seeded |h| < 1.05
Present and Future work.
 MOORE in release 6.6.0 towards 7.0.0
Migration to gcc3.2 accomplished Wrapped strategy (working)
Seeded strategy (no RecoRoI from LVL1)
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After release 6.6.0 more general changes have to be considered (e.g.
Compact Identifiers- Id Helpers). Those changes effect the MOORE
execution time.
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Implementation of the complete Muon slice
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Calculation of efficiency curves and trigger rates using single muons sample
Calculation of efficiency curves and trigger rates using realistic event samples
EventFilter
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Read LVL2 output results (see G.Comune presentation)
Efficiency curves and trigger rates
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Timing table has to be evaluated once again
Selection on Physic samples
RPC bytestream converters
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Full online implementation of TrigMoore.
List of related papers
ATLAS notes for more information:
Moore as Event Filter in the ATLAS High Level Trigger ATL-SOFT-2003-008, ATL-DAQ-2003-020
Track reconstruction in the ATLAS Muon Spectrometer with MOORE ATL-SOFT-2003-007