A. BHASIN ALICE offline Software Week 13th June 2002 Dimuon High Lelvel Trigger (DHLT) ● Goals ● FM Algorithm ● Proposal for a new Algorithm.

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Presentation transcript:

A. BHASIN ALICE offline Software Week 13th June 2002 Dimuon High Lelvel Trigger (DHLT) ● Goals ● FM Algorithm ● Proposal for a new Algorithm

A. BHASIN ALICE offline Software Week 13th June 2002 DIMUON SPECTROMETER

A. BHASIN ALICE offline Software Week 13th June 2002 Goals  Demonstrate that algorithm can achieve 5-6 rate reduction using only small fraction of event data(from station 4 & 5).  Implement this algorithm in AliRoot framework(should be extractable for implementation on hardware)  Provision to include other tracking stations, trigger chamber, other detectors(ITS) and study the efficiency.  Need to validate the algorithms for Dimuon physics plan, taking into account all possible backgrounds.

A. BHASIN ALICE offline Software Week 13th June 2002 FM Algorithm Muon Filter Dipole (xf,yf,zf)  Station 4 Station 5 T1 Y T2 (X,Y) T1 RsRs R PRO T2 Franck Manso’s algorithm – Filtering and uses the hit information from stations 4 & 5 to improve the p T resolution and hence the p T cut – Helps in reducing the background.

A. BHASIN ALICE offline Software Week 13th June 2002 Proposed Algorithm ● Hit finding in station 4 and 5 using the Raw Clusters (cog method). Make segments in each of these stations and calculate p T. ● Validate the track in Station 3. ● Provision for including other Stations(1 &2), Trigger chambers and other detectors for better track information.

A. BHASIN ALICE offline Software Week 13th June 2002 Implementation In AliRoot galice.root ReadHits( ) RawClustersSt45( ) FillEventHlt( ) HltDecission( ) AliMUONHlt Simple Clustering (C.O.G method) only deconvulate clusters AliMUON RawClusters AliMUONEventReconstructor SortHitsForRecInSt45( ) MakeSegmentsPerStation( ) MakeSegments45( ) MakeTracks( ) MaketrackCandidateswithTwosegments( ) MakeTrackCandidatewithoneSegmentationandonepoint( ) MakeTrackCandidatesSt45( ) RemoveDoubleTrack( ) FollowTracksinSt3usinghits( ) FollowTracksinst1&2usingLUT( ) GetBendingMomentumFromImpactParameter( ) AliMUONHlt :: RawClustersSt45( ) TreeR AliMUONHlt::FillEventHlt( ) MUONHlt TreeR