1. lcsim: Physics & Detector Simulations
LCWS 2011
Granada, Spain
September 27, 2011
Norman Graf
SLAC

2. Framework Overview APPLICATIONS DATA Event Gen StdHep LCIO Events SLIC
Pythia,
WHIZARD, etc.
StdHep
Event Gen
LCDD
LCIO Events
SLIC
Simulation
LCIO PFOs
Event
Reconstruction
Pandora XML
Tracking
PFA
Compact
LCIO
AIDA
Event
Analysis
LCSim
Publication
JAS3
Wired
Tuple Analysis
Visualization

3. Simulation & Reconstruction
SLIC provides full detector simulation in Geant runtime detector description in XML - stdhep input - standard LCIO output
org.lcsim reconstruction/analysis suite
Java-based reconstruction & analysis framework
full, ab initio signal digitization, track finding & fitting, calorimeter cluster finding and association (PFA)
LCIO provides access to global LC code base
flavor-tagging via LCFI
PFA via Pandora
AIDA histogramming and fitting
WIRED 3-D event display

4. slic updates
LCIO2.0
Read spin and color flow from input stdhep event, add to MCParticles.
If requested, store and save calorimeter hit positions within cells to enable more refined hit calculations.

5. slic updates Using geant4 9.4.p02 Testing geant4 9.5 beta
Comparing new physics lists
Await some guidance from CALICE
SCTG will agree on a common set for the DBD
Testing geant4 9.5 beta
Would like to use 9.5 for DBD production
May incorporate charge sharing calculations for RPC response into slic directly
Awaiting results of space and CPU usage

6. org.lcsim Calorimetry
RPC response will be improved to account for charge sharing across readout pads, electronic noise and inefficiency.
Algorithms will be implemented in reconstruction software, may be migrated to simulation software if deemed appropriate.
GEM and Micromegas responses will also be modelled.
Scintillator response will still be supported, input from CALICE on uniformity, etc. will be used.

7. org.lcsim Tracking I
TrackerHit classes will make use of new LCIO classes which support 1D and 2D hits on planar surfaces.
Track will incorporate new TrackState classes.
Existing collections will be moved.
Improvements in silicon pixel response simulations will be presented by N. Sinev on Wednesday.
Status of non-prompt tracking will be presented by B. Schumm on Wednesday.

8. org.lcsim Tracking II
Work ongoing to implement existing Kalman Filter code into standard reconstruction stream.
Extrapolator will be used to calculate TrackStates at Calorimeter face and at the dca to the IP.
Work ongoing to improve overall tracking simulations
Effects of field map will be investigated.
Runge-Kutta stepper code being adapted.

9. Individual Particle Reconstruction

10. PFA
R. Zaidan will present the status of the UIowa PFA on Thursday morning.
slicPandora was successfully used to simulate the response of SiD’ (clic_sid_cdr) for the CLiC CDR.
A. Muennich will present the results Thursday AM.
Number of improvements have been made recently
internal restructuring to provide more flexibility in defining input LCIO collections
accommodation of changes to pandoraPFA itself
See next talk by J. Marshall.

11. Vertexing
LCFIVertex has been used for the LOI and CDR to provide secondary vertex identification and jet flavor tagging.
See talk by J. Strube on Wednesday
Intend to follow new developments in LCFIVertexPlus and adopt to them as necessary.
See talk by T. Tanabe on Wednesday

12. SLAC Scientific Computing Applications
New group formed at SLAC last year
Amalgamation of previous Babar, Fermi, Geant4, Computing Division groups
~25 people providing software application support to experiments at SLAC
Currently no dedicated funding for ILC/SiD/lcsim but proposal being developed to submit to DOE
lcsim is getting some indirect support
WIRED
Support taken over by Dmitry Onoprienko
Effort funded by Fermi (a.k.a GLAST)
Reuse of Fermi pipeline/data catalog
JAS/Plotter
Support taken over by Brian Van Klaveren
Funded by Fermi, LSST
Work on new plotter ongoing

13. JAS3 & Wired
Support for spin and color information in stdhep and lcio files has been added to the lcio browser.
Number of improvements added to the Wired event display.
object selection fully synchronized between all panels, tools, and views
keyboard shortcuts
ability to clone views (visibility, selection, cuts settings will remain shared among all cloned views) and to copy views (initial settings for visibility, selection, and cuts are copied from an existing view)
selection is preserved when switching tools/handlers/control panels
WIRED settings are integrated into JAS3 preferences menu
picking options are fully functional
cuts functionality extended.
Manual available at
Plan to implement online web start version (similar to Fermi/GLAST)

14. JAS/Plotter New plotter under development
Already in use by EXO, LSST
JAS3 will be updated to include this plotter
Many improvements over existing plotter
Cleaner design aids extensibility
More plot types
More control over plot style
“publication quality plots”
Cleaner separation of code separates graphics from code
Java 2D
pdf/svg/png etc
HTML5 canvas
opengl/webgl
New feature requests welcome

15. Reuse of GLAST pipeline/data catalog
“pipeline” + data catalog developed for GLAST
Allows automation/book-keeping/reprocessing for large number of batch jobs
Allows datasets to be easily found and accessed
Can submit jobs to LSF, BQS, Condor
Being interfaced to Grid
Already being used by EXO, SuperCDMS experiments
Possibility to use this for automation of future event sample generation

16. Detector Optimization
Not yet settled on final SiD version to be used for the physics benchmarking.
Expect detector optimization studies to be undertaken in the next several months.
Sub-detector optimizations and studies will continue beyond the freeze-out point.
In addition to the baseline, some alternatives will be studied
e.g. all-pixel silicon tracker (SPT).

17. The Grid
SiD intends to make full use of Grid Storage Element and computing resources for the DBD detector response simulation and physics benchmarking exercise.
Full tool chain using Dirac has been developed and successfully used to complete the CLiC CDR exercise.
Will work with ILD colleagues under the aegis of the SCTG to arrive at common solutions and resource sharing agreement.

18. DBD Physics Benchmarking
We are looking forward to freezing the accelerator parameters for the purpose of physics benchmarking event generation at this meeting.
To minimize the computing and storage resources, and to streamline the bookkeeping, I would personally prefer to have a minimal set of events.
e.g. pre-mixed polarizations
See talk by A. Miyamoto later in this session for details.

19. The Path to 2012
Focus and goal for SiD is the Detailed Baseline Design of the detector for 2012.
Ongoing work in all subsystems, but each on its own timeline – aiming for convergence by 2012, but it is clear that R&D will continue beyond this point.
Developing more realistic detector description – folding in increasing realism in subsystem elements and modifying simulation and reconstruction software to accommodate these improvements.
Mutually beneficial cooperation and collaboration with CLiC detector group on SiD’.

20. Strategy for Future Lepton Collider Physics/Detector Studies
Five HEP labs presented DOE HEP with a “White Paper on US Strategy for Physics and Detectors at Future Lepton Colliders” at the HEP Electron Program review in 2010
Urged support for continued studies of the physics and detectors at lepton colliders, suggesting what studies were appropriate, and proposing in general terms how to proceed
They noted that the desired energy reach is still uncertain, and listed several candidate machines at different stages of development, ILC (mature), CLIC (evolving), and the MuonCollider (MuC) (nascent) with different energy capabilities.
They also noted that an even-handed comparison of these different options would educate the whole HEP community and prepare it for a rational choice in the future Snowmass 2013 clearly represents such an opportunity

21. Lepton Collider Framework Proposal
Goal: Establish the physics capability for energy frontier lepton colliders
LCFP will coordinate studies needed to reach that goal
Define and compare the physics potential for Lepton Colliders with a common benchmarks and simulation tools
Evaluate machine backgrounds and their impact on physics capabilities
Provide feedback to the machine designs
Support developing detector concepts for Lepton Colliders
Provide a common simulation framework
Establish a list of critical R&D required
Coordinate Lepton Collider related detector R&D as part of a national generic R&D program
D. MacFarlane

22. Beyond 2012
LCDRD developed in response to current University Detector R&D Program (SiD/Oregon) funding ending at end of Continuation and extension.
Support all Lepton Colliders: ILC, CLIC, MuC
Support detector concept development
Identify R&D critical for concepts and initiate it
Finish up ILC R&D, start CLIC R&D, identify needed MuC R&D
Support the lcsim simulation infrastructure for detector studies .
SLAC submitted (after internal review) consortium proposal combining 14 individual proposals on March 18, 2011.
After DOE establishes funding level for Consortium, Review Board will set funding levels consistent with DOE guidelines
Annual reviews and solicitations of new proposals; annual reports to DOE.
Need a common simulation framework to support physics and detector studies
SLAC & Fermilab will submit a joint proposal to DOE to enhance LCSim physics and detector response capabilities and provide community support
Aim to cooperate/collaborate with AIDA and JSPS on common efforts