Sim/Recon DBD Editors Report Norman Graf (SLAC) Jan Strube (CERN) SiD Workshop SLAC, August 22, 2012.

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Presentation transcript:

Sim/Recon DBD Editors Report Norman Graf (SLAC) Jan Strube (CERN) SiD Workshop SLAC, August 22, 2012

Software Chain for the DBD Event Generation  Whizard, physsim, Guineapig Detector response simulation (slic) Event Reconstruction  Event overlay  lcsim tracking  slicPandora PFA  LCFI vertex finding Analysis  LCFI+ flavor tagging  Everything else 2

Simulation Geant4 9.5, QGSP_BERT Latest version of slic  LCIO 2.0  Applying z smearing of event vertex at runtime.  Applying boost to simulate crossing angle sidloi3 detector for DBD Physics benchmarking  Detector variants for comparative performance studies 3

MCDI (Monte Carlo – Detector Interface)  All MC events generated at (0,0,0)  ILC 1000 B1b has gaussian luminous region in z with  =225  m Simulate “physics” events at z=0 (for technical reasons) Simulate backgrounds with  z =225  m*  2  Apply 7mr boost to give 14mr crossing angle.  Events generated for all four polarization states. SiD has generated “mixed” samples corresponding to the expected 80% e - and 20% e + polarization. Simplifies bookkeeping, provides some protection against missing or incorrect mixing at analysis stage Missing files means missing luminosity, not important channels. 4

sidloi3 Essentially the detector described in the LOI, with reasonably complex detector geometry. 5

Tracking Detectors 8

Overlay Driver Merging of LCIO files after full simulation and before digitization  Merge collections  Displace hits/entries in time  One bunch crossing  Multiple background files GuineaPig pairs  →hadrons (Poisson-distributed, mean of 4.1) 9

Digitization After overlaying of SimTrackerHit and SimCalorimeterHit collections, need to digitize. Tracker digitization simulates the charge deposition, sharing, shaping and readout to produce TrackerHit objects. EM Calorimeter hits convert measured energy to deposited energy using Sampling Fractions Hadron Calorimeter hits are 1:1 mapping of MC hit to CalorimeterHit.  Charge sharing, efficiencies, etc. not yet in.  Can be used for detector performance studies, but will not be included in benchmarking studies. 10

Track Reconstruction Using ab initio track finding and fitting. Debugged and tested in action by CLiC CDR Final testing, tuning (e.g. new strategies) and characterization underway (primarily Christian Grefe)  (see Jan’s talk) 11

PFA Using slicPandora as interface to PandoraPFA Tested, debugged during CLiC CDR Final QA after changes were made to the interface and new functionality added for ILD Generating detector performance plots (e.g. efficiencies, resolutions) as part of QA process. PandoraPFA has some particle ID built in, but will most likely be running final ID of our own.  Need to locate, update, implement code used during LOI studies 12

LCFI+ Combined vertex finding/fitting and flavor-tagging Will only run first part in production reconstruction.  CPU intensive, and common Flavor-tagging part of analysis  Neural nets are final-state dependent  Training and application will be done by each analysis group. 13

DST Full reco files will be written out, but all physics analyses should target the DST files. Essentially list of Particle Flow Objects (PFOs) and Vertices. Small enough to fit on laptop, making analysis portable. 14

Data availability All files will reside on Grid Storage Elements (GSE), replicated at multiple sites. One of the sites is SLAC.  Disks are also accessible via anonymous ftp for those without Grid certificates or membership in ILC VO, or simply for convenience. 15

Production Using ILCDirac production management pioneered for CLiC CDR  Stephane Poss doing the heavy lifting Running on the Grid under ILC VO  Gentlemen’s agreement with ILD not to step on each other’s toes  Primarily using LCG resources (See Jan’s talk)  Expect increase in OSG resources (See David’s talk) Dashboard available at Many thanks to CERN group (Christian, Jan, Philipp, Stephane) Jeremy taking responsibility for prod czar. 16

Status of the DBD Chapter I 17

Status of the DBD Chapter II Busy writing code, production scripts, running jobs, identifying resources,… Will begin writing text in earnest next week. Will use LOI chapter and appendix as well as CDR chapters as basis. Will coordinate with other chapter editors on what detector performance plots will be generated and where they will be defined.  Tracking/vertex and calorimeter for subdetectors  Benchmarking for full-detector characterization. 18