- Create veloR (2d) tracks
- Decode L0MuonCandidate
- Match veloR track with L0MuonCandidate
- Create Muon Segments from hits in M5-M2
- Match veloR track with Muon segments if there was at least one matching with L0MuonCandidate
- Reconstruct veloSpace (3d) tracks for those veloR flagged as muons
- Match veloSpace track with L0MuonCandidate
- Match veloSpace track with Muon segments if there was at least one matching with L0MuonCandidate
- Reconstruct 2d PV vertex
- Take muon pre trigger decision ++++ Cuts values in the Conditions Data Base
- Parameters used to calibrate the energy of an L0muonCandidate (used in the matching of 2d and 3d tracks with L0muonCandidate)
- ptkickConstant
- M1EcorParams0
- M1EcorParams1
- M1EcorParams2
- M1EresParams0
- M1EresParams1

- Cut applied to the matching of 2d tracks with L0muonCandidate
- Chisquare of matching = chi2DrDz + chi2Phi , where
- chi2DrDz = ( deltaDrDz* deltaDrDz)/ (errdrdzL0*errdrdzL0 )
- chi2Phi = ( deltaPhi*deltaPhi) / (errphiL0*errphiL0 + ephiTrack*ephiTrack)
- originally determined from MC, chosen as to give the best purity, efficiency

- Chisquare of matching = chi2DrDz + chi2Phi , where
- Cut applied to the matching of 3d tracks with L0muonCandidate
- Chisquare of matching = deltaX*deltaX + deltaY*deltaY , where
- deltaX = q*(L0dxdz - trackDxDz)/errdxdzL0
- deltaY = dydzSign*(L0dydz - trackDyDz)/errdydzL0
- originally determined from MC, chosen as to give the best purity, efficiency

- Chisquare of matching = deltaX*deltaX + deltaY*deltaY , where
- Cut applied in the Muon segments reconstruction
- distance along X and along Y from the extrapolation of partial segment (Mi+1 - M5) in station Mi The cut varies with the region, so in total we have region*station*direction)=4*3*2=24 parameters.

- Cuts applied to the matching of 2d tracks with Muon segments
- Delta x [Region] : difference in x extrapolation of 2d track and muon segment to the zmagnet. One value for each muon region.
- yTol : some tolerance to the extrapolation of muon segment to the r-phi velo sector

- Cuts applied to the matching of 3d tracks with Muon segments
- Delta x [Region] : difference in x extrapolation of 3d track and muon segment to the zmagnet. One value for each muon region.
- Delta y [Region] : difference in y extrapolation of 3d track and muon segment to M2 z position. One value for each muon region.

- Cuts applied to the HltPreMuonAlleyDecision
- Single Muon
- MuIPVeto - if IP for a single muon wrt any vertex < MuIPVeto, it points to a PV, discard it.
- MuIPMinCut
- PtSingleMuCut

- Dimuon
- diMuMassCut
- diMuIPCut - smallest Ip of the two muons

- JPsi
- diMuMass > JPsiMass - MassWindowCut

- Single Muon

- Cuts applied to the matching of forward tracks with Muon segments
- Delta pos : square difference among the extrapolation of long track and muon segment at M2 Z position. The difference is evaluated as sqrt(pow(Delta x,2)+pow(Delta y,2)/4). The applied cut is function of the momentum of the muon using the parametrized formula sqrt(a*a+b*b/(p*p)). In total we have 2 parameters: a and b.

- Cuts applied to the HltMuonAlleyDecision
- Single Muon
- MuIPVeto - if IP for a single muon wrt any vertex < MuIPVeto, it points to a PV, discard it.
- MuIPMinCut
- PtSingleMuCut

- Dimuon
- diMuMassCut
- diMuIPCut - smallest Ip of the two muons

- JPsi
- diMuMass > JPsiMass - MassWindowCut

- Single Muon

- MuonL0ConfirmationBox

- MuonPreTriggerBox
- Chisquare of matching of 2D to L0
- Chisquare of matching of 3D to L0
- delta x of matching of 2D to muon segments
- delta x of matching of 3D to muon segments
- delta y of matching of 3D to muon segments
- smallest distance from L0 extrapolation to VELO sector board ( yTol monitoring)
- Single muon Pt
- Single muon Ip
- Single Muon MuIPVeto
- diMuMass
- diMuIp
- pointer to the 3D triggered tracks

- MuonTriggerBox
- delta x of matching of forwart track to muon segments
- delta y of matching of forwart track to muon segments
- Single muon Pt
- Single muon Ip
- Single Muon MuIPVeto
- diMuMass
- diMuIp
- pointer to the forward triggered tracks

- all summary box variables
- Calibration L0 muon energy distribution
- time evolution of mean values
- Number of L0 Muon candidates
- Number of 2D tracks
- Number of 2D tracks flagged as Muons
- Number of 2D tracks in a IP window
- Number of 3D tracks in a IP window
- Number of Velo-TT tracks (in a IP Window)
- Number of 3D tracks
- Number of 3D tracks flagged as Muons
- Number of 3D tracks flagged as Muons found in TT
- Number of forward tracks (in a IP Window)
- Number of forward tracks
- Number of 2D PV
- Number of 3D PV

-- Alessia Satta -12 Jun 2006

-- Sandra Amato - 20 Jun 2006

This topic: LHCb > LHCbTrigger > MuonAlley

Topic revision: r12 - 2007-10-29 - StephenWotton

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