  

MOORE

( M uon O bject O riented RE construction)  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 Trigger at the E vent F ilter stage .

MOORE/MuID in the framework of High Level  

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).

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. RecMuonRoI ( h ± D h , f ± D f )

RegionSelector Hash offline IDs

TDS (ZEBRA)

DigitsCollection (RPCs and MDTs)

RPCDigitContainer MDTDigitContainer MooHLTAlgo decision

MooMakePhiSegmentSeeded MooMakeRZSegmentSeeded

Tracks PhiSegmentContainer RZSegmentContainer (TDS) MooMakeRoads MooMakeTracks

TrigMoore timing tests (I)

Timing test performed on 6.0.4 release DC1 single Muons execution times     

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)

Tails

TrigMoore timing tests(II)

Timing test performed on 6.0.4 release

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

p T (GeV/c) Seeded: Access only the RoI from the LVL1 (msec) rms (msec) Wrapped, Full event Reconstruction (msec) rms (msec) 8 20 50 100 300 100+X1 100+X2 73 59 61 61 75 763 1218 30 15 19 75 23 37 50 68 58 58 64 64 2680 5900 30 21 25 26 32 450 1100 DC1 single Muons execution times Single Muons + Pile up

TrigMoore timing efficiency

A time efficiency has been defined as the ratio between the number of reconstructed tracks in one second and the total number of reconstructed tracks

DC1 single Muons

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 )   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.

Timing table has to be evaluated once again

  Implementation of the complete Muon slice

Read LVL2 output results (see G.Comune presentation)

   Efficiency curves and trigger rates

Calculation of efficiency curves and trigger rates using single muons sample Calculation of efficiency curves and trigger rates using realistic event samples

  EventFilter

Selection on Physic samples

  RPC bytestream converters

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