Moore for HLT/EF

1

• MOORE (Muon Object Oriented REconstruction)
• Track reconstruction in the Muon Spectrometer
• MuonIdentification
• Reconstruction and Identification of Muons
• Divided in two components
• MuidStandAlone
• Extrapolation of tracks reconstructed by MOORE
  to the interaction point.
• MuidComb
• 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 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).

2
Moore in HLT- a contact point between offline
and online.
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.
Main ideas
Avoid the code duplication! Only the seeding has
an ad hoc implementation for the online
environment.

• 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)

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
Wrapped, Full event Reconstruction
Seeded Access only the RoI from the LVL1
pT (GeV/c) ltTgt (msec) rms (msec) ltTgt (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
3
Wrapped strategy h lt 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 seeded h lt 1.05
Strategy wrapped h lt 1.05
4
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