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File indexing completed on 2024-04-06 12:29:18
0001 import FWCore.ParameterSet.Config as cms 0002 0003 generalV0Candidates = cms.EDProducer("V0Producer", 0004 0005 # which beamSpot to reference 0006 beamSpot = cms.InputTag('offlineBeamSpot'), 0007 0008 # reference primary vertex instead of beamSpot 0009 useVertex = cms.bool(False), 0010 # which vertex collection to use 0011 vertices = cms.InputTag('offlinePrimaryVertices'), 0012 0013 # which TrackCollection to use for vertexing 0014 trackRecoAlgorithm = cms.InputTag('generalTracks'), 0015 0016 # which V0s to reconstruct 0017 doKShorts = cms.bool(True), 0018 doLambdas = cms.bool(True), 0019 0020 # perform vertex fit (if false, the POCA is used in lieu of the point 0021 # resulting from a fit) 0022 doFit = cms.bool(True), 0023 0024 # which vertex fitting algorithm to use 0025 # True -> KalmanVertexFitter (recommended) 0026 # False -> AdaptiveVertexFitter (not recommended) 0027 vertexFitter = cms.bool(True), 0028 0029 # use the refitted tracks returned from the KVF for V0Candidate kinematics 0030 # this is automatically set to False if using the AdaptiveVertexFitter 0031 useRefTracks = cms.bool(True), 0032 0033 # -- cuts on initial track collection -- 0034 # Track normalized Chi2 < 0035 tkChi2Cut = cms.double(10.), 0036 # Number of valid hits on track >= 0037 tkNHitsCut = cms.int32(3), 0038 # Pt of track > 0039 tkPtCut = cms.double(0.35), 0040 # Track impact parameter significance > 0041 tkIPSigXYCut = cms.double(2.), 0042 tkIPSigZCut = cms.double(-1.), 0043 0044 # -- cuts on the vertex -- 0045 # Vertex chi2 < 0046 vtxChi2Cut = cms.double(6.63), 0047 # XY decay distance significance > 0048 vtxDecaySigXYCut = cms.double(15.), 0049 # XY decay distance > 0050 vtxDecayXYCut = cms.double(-1.), 0051 # XY decay distance for same-sign vertices > 0052 ssVtxDecayXYCut = cms.double(-1.), 0053 # XYZ decay distance significance > 0054 vtxDecaySigXYZCut = cms.double(-1.), 0055 0056 # -- miscellaneous cuts -- 0057 # allow same-sign pairs of tracks 0058 allowSS = cms.bool(False), 0059 # Threshold for inner/outer DCA cuts: 0060 # inner tracks = distance between POCA and z-axis < 0061 # outer tracks = distance between POCA and z-axis >= 0062 innerOuterTkDCAThreshold = cms.double(5.), 0063 # POCA distance between inner tracks < 0064 innerTkDCACut = cms.double(1.), 0065 # POCA distance between outer tracks < 0066 outerTkDCACut = cms.double(1.), 0067 # allow vertices where the angle between the tracks is more than 90 degrees 0068 allowWideAngleVtx = cms.bool(False), 0069 # invariant mass of track pair - assuming both tracks are charged pions < 0070 mPiPiCut = cms.double(0.6), 0071 # check if either track has a hit radially inside the vertex position minus this number times the sigma of the vertex fit 0072 # note: Set this to -1 to disable this cut, which MUST be done if you want to run V0Producer on the AOD track collection! 0073 innerHitPosCut = cms.double(4.), 0074 # cos(angleXY) between x and p of V0 candidate > 0075 cosThetaXYCut = cms.double(0.998), 0076 # cos(angleXYZ) between x and p of V0 candidate > 0077 cosThetaXYZCut = cms.double(-2.), 0078 0079 # -- cuts on the V0 candidate mass -- 0080 # V0 mass window +- pdg value 0081 kShortMassCut = cms.double(0.07), 0082 lambdaMassCut = cms.double(0.05) 0083 0084 ) 0085
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