Status of Analysis Software Kanglin He For Analysis Software Group

Outline  Physics Tools Project  Particle ID  Composition Tools  Analysis Event Data Model  Global Link and Event Assembly  Analysis Event Data Model  BParticle Project  Event/Physics Tags Project  Event Classification  Physics Tags  Event Collection, Filter  Physics Performance Check  Summary

Status of Particle ID  DedxPID  Ready now  TofPID  Barrel inner TOF PID  Ready now  Barrel outer TOF PID  Ready now  MuonID  Ready now, by PKU  EmcPID  Not ready  Endcap TOF PID  Not ready  TOFQ PID  Not ready See Dr. Ji X.B ‘s talk for performance check

Composition Tools  Telesis  BESII Kinematic Fit package  C++ implemented by SDU  BKlamsVTX  BESII Ks, Λ reconstruction package  C++ implemented by Dr. B.J. Liu  VertexFit  VertexFit  SecondVertexFit  KinematicFit

Status of Telesis  Track presentation  (φ,κ,λ) for charged track  (φ,λ, sqrt(E)) for neutral track  Constraints  Resonance  Momentum-energy conservation  Miss track  Worked smoothly in BOSS

Status of BKlamsVTX  Get the point (s) of intersection of two helices in transverse plane  Check if the 2nd vertex candidate is located in reasonable region  Worked smoothly in BOSS See B. J. Liu’s talk for detail

Status of Vertex Fit  Formulas (adopt from Paul Avery’s Lessons)  Include: VertexFit, KinematicFit and 3-D SecondVertexFit  Support Composed Particle  Reconstructed π 0, η  Reconstructed Ks, Λ  Particle and Vertex presentation

Kinematic Constraints  Invariant mass constraints  Total energy constraints  Total Momentum constraints  Total 3-momentum constraints  Total 4-momentum constraints  Equal mass constraints

Vertex Constraints  Vertex constraint to a fixed position  Vertex constraint to an unknown position  General Vertex fit  Swimming Track parameters and Error matrix to vertex position

SecondVertexFit  Find decay vertex position of Ks/Λ through VertexFit  Performing a 2-C fit by applying the alignment constraints  Calculating the decay length and its error Xp: production position (beam position) Xd: decay position

Summary of Analysis Tools  Particle ID package  Hadron identification by combined TOF and dE/dx information  Muon identification by MuonID  Electron identification is not completed  All Composition Tools packaged are worked smoothly and stably in BOSS

Analysis Event Data Model  Dst Event Data Model  From Reconstruction  DstTrackList  Global Link and Dst Event Assembly  Analysis Event Data Model  BParticle Project  Physics Event Data Model  Physics Group

Analysis Event Data Flow

Global Link  MDC reconstruction  dE/dx, Kalman fit track  Match to TOF and Muon counter Track  Applying Track Extrapolatio information, done in Reconstruction  Match to EMC  Position difference of extTrk and emc Track, treat as Neutral tracks if not matched See Wang L.L ‘s talk for detail

Dst Track List Collection  trackID()  MdcTrk()  DstMdcTrack  MdcKalTrk()  DstMdcKalTrack  Dedx()  DstDedx  TofTrk()  DstTofTrack  EmcTrk()  DstEmcTrack  MucTrk()  DstMucTrack  ExtTrk()  DstExtTrack Access sub-detector info through a set of pointers

B(es)Particle Project  Write Particle (Charged tracks, neutrals, Vertice and composed particle) information into TDS. Analysis Algorithm can access these info.  May develop to a common standard platform, make Analysis job easily and friendly  Allow Physics groups to design Physics Data model easily

Contents  BParticle Collection  Event Analysis Event Data Model  BParticleID Collection  Particle identification data  BTrack Collection  Charged and Neutral Track infomation data  BVertex Collection  (2nd)Vertex Reconstruction data  BStableParticle Collection  Photon, Electron, Muon, Pion, Kaon, Proton  BComposedParticle Collection  π 0,η,Ks,Λ etc

B(es)Particle Project

Status of BTrack  Photon selection algorithm  Energy Threshold  Angle between photon and Charged Track  Angle between photons  Charged Track Selection algorithm  Impact parameters (Rxy and Z0),Pxy,Polar angle  Particle ID information  Selection criteria controlled by job option file  Good Tracks are put into Photon, electron, Muon, Pion, Kaon, Proton Collection See X.B Ji and M.S Chen’s talk for detail

Status of BVertex  Ks and Λ decay vertex are implemented  BKlamsVTX  SecondVertexFit  Gamma conversion vertex will come out soon  1st Vertex reconstruction will be done in Physics analysis level  Well reconstructed Ks and Λ are put into BParticle Collection (selection criteria controlled by job Option file) See B.J Liu’s talk for detail

Status of Pi0/Eta Reconstruction  π 0 /η  γγ  Raw mass region  Chisq of mass constraint fit  Decay angle cut  Reconstructed π 0 /η are put into Pi0/Eta Collection  Selection criteria controlled by job Option file See M.S Chen’s talk for detail

Summary of Analysis Event Data Model  Global Link and Dst Event Assembly  Integrated into BOSS beta Release  First analysis J/Ψ  ρπ come out in the middle of October 2005  After BOSS beta release, a prototype of BESIII analysis event data model was designed  BParticle Collection  BTrack/BParticleID Collection  BVertex Collection  BStableParticle/BComposedParticle Collection  Analysis Event Data Model was implemented by BParticle Project  Charged/Neutral Track Selection Algorithm  Vertex Reconstruction/Selection Algorithm  π 0 /η Reconstruction/Selection Algorithm  BParticle Project will be developed to Standard BESIII Analysis Framework

Status of Event/Physics Tags Project  Event Classification (will be started)  Bhabha/Dimu/Hadron/etc.  X.H Mo is working on  Physics Tags (started)  Physics Tag Event Data Model  Designed by Physics Group  Charm Meson Tags (D 0, D +, Ds)  J.Y Zhang, Y.Z Sun, S.S Sun are working on  J/Ψ tags (Ψ’  ππJ/Ψ)  X.H Mo, Li Gang are working on  Other Physics Tags  Event Collection/Filter (not started)  Event Collection  Filter: sub-sets of data containing selected tags

Physics Performance Check  Charged Track  Hadron Performance (X.B Ji’s talk)  MuonID Performance (PKU)  Photon( π 0 /η ) performance  M.S Chen’s talk  Decay Vertex Reconstruction  B.J Liu’s talk  J/Ψ,Ψ’, D/Ds Analysis  X.H Mo, X.B Ji, J.Y Zhang ‘s talks

Energy threshold at 40MeV GeV Efficiencies(100%) Photon detection Efficiencies as a function of E 20MeV 30MeV 40MeV 50MeV 60MeV 70MeV

From Li H.B No 4C fit After 4C fit

From Li H B 50 K Inclusive Ψ ” MC data

~3MeV ~1.2MeV 50 K Inclusive Ψ ” MC data

From Y.Z Sun

From J. Y Zhang

From Li Gang

50K inclusive Ψ ’ MC data Inclusive photon Energy

Summary  Analysis Software in Good but not perfect status, physics analysis can be started  Need More Manpower in ParticleID package  A prototype of BESIII Analysis Event Data Model has been designed and developed  Event/Physics Tags project will be developed in 2006  Many(but not enough) Physics Performance checks have been done Thank You Welcome to join us