Post on 18-Jan-2016
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 4Station 5
T1
YT2
(X,Y)T1
Rs
RPRO
T2
Franck Manso’s algorithm – Filtering and uses the hit information from stations 4 & 5 to improve the pT resolution and hence the pT 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 pT.
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.rootReadHits( )
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