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Cell Division and Layer Construction in BesIII Simulation and Digitization

This presentation provides insights into wire layer construction and sensitive areas in BesIII simulation. Topics covered include hit recording, digitization process, spatial resolution, and corrections for optimal simulation results.

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Cell Division and Layer Construction in BesIII Simulation and Digitization

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  1. MDC Simulation & Digitization Yuan Ye 20050921 BesIII Software Meeting

  2. Cell Equal Division Wire Layer Construction Sensitive Area Sensitive Area • Straight Wire • Ideal Position

  3. Hit Record every hit LayerNo CellNo Edeposit Ddift Ttof (Global time from event begin) global  local

  4. Digitization • Loop over all hits, combine hits from same cell to one Digi • Edigi=Edeposit • Ddigi • Energy cut Now Emin=0, needed • T Do X-T conversion, T =Ttof + Tdrift • Ddrift of minimum T

  5. Digitization(Cont.) • Smear • Get Spatial Resolution from Cal. x=(f 12+(1-f) 22)1/2 • Sample between 12 use f Possible correction: Edigi • Electronic correction 20m: 2= 1,22- electronic2 • Sample use  Ddigi=Ddigi+ Dsmear If Ddigi<0, do again

  6. Digitization(Cont.) • X-T conversion Ddigi Tdrift • Create Tdigi • Tdigi = Tdrift + Ttof + Ttransfer • Possible Correct : Edigi & threshold • T to TDC

  7. Multiple Scatter vs Step Limit @1GeV StepLimit 5 4 3 2 1.5 1 cm pt 11.1 7.8 4.9 4.1 4.0 3.5 Mev Now we set default is 2cm

  8. Background • Two methods: • Add in digitization use some model (done) • Digi mix (future) Mix background from data with MC

  9. Thanks!

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