Pixel Phase 1 Upgrade Simulation: Technical Status and Plans (Fermilab) (For the Tracker Upgrade Simulations Group) Pixel Phase 1 Upgrade Simulation: Technical Status and Plans Harry Cheung (Fermilab) (For the Tracker Upgrade Simulations Group)

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 2 Technical/Software: Geometry Recently a lot of technical work done on Phase 1 simulations We have a Phase 1 geometry setup for Full and Fast Simulations Includes option for smaller radius inner barrel layer (and beam pipe) Configurable sized pixels in each layer Phase 1 Std Geom

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 3 Technical/Software: Geometry Rechits from simulations of dimuons: Smaller radius inner layer option Can change pixel size via a single XML geometry file for each layer and disk

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 4 Technical/SW: Fast Simulation Material budget now matched to Full Simulation Code to directly compare material budget between Fast and Full simulations Green Histo: Fastsim Dots: Fullsim CMSSW_3_3_6 Phase 1Std Geom Material budget plots from Paul Sheldon

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 5 Technical/SW: Hits & Tracking Tracking efficiency for dimuons with non-iterative (CMSSW_1_8_4-like) tracking and triplet seeds Full sim looks “okay”/as expected - need more detailed validation Compare smaller radius inner layer option

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 6 Fast Sim Issues: Occupancies Fast Simulation issue: Tracker occupancies No out-of-time pileup for Fast Simulation (may be small issue only?) “In-time” Tracker occupancies differ in Fast and Full Sim: still investigating Illustration: Rates from first “Stack Layer” in Long barrel geometry: Digi rates Simhit rates Occupancy plots from Emmanuele Salvati (rates for min-bias and 50 PU x 4 /module)

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 7 Fast Sim Issues: Hits/Tracking Tracking efficiency for dimuons with non-iterative tracking: Still issues for Fast simulation matching Full Sim in new FPix region Matches for standard geometry, but not Phase 1: Needs studying Phase 1Std Geom

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 8 (Common) Issues: Geometry Material budget: Still some issues BPix cooling reweigh only, using std. geom. ladder and module construction Need information from Roland (BPix weight currently over-estimated) FPix (services) material not completely implemented Need more services (FPix weight currently under-estimated) Green Histo: Phase 1 Dots: Std geometry CMSSW_3_3_6 Material budget plots from Paul Sheldon

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 9 Issues: Hit Position and Error Rechit (cluster) position and errors Pixel hit positions and errors from code optimized for standard geometry Need to create appropriate code for upgrade geometry Account for variation of pixel sizes, and different FPix construction/tilts

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 10 Issues: Iterative Tracking Iterative Tracking Studies Full Sim using CMSSW_3_3_6 with iterative tracking and 3/4 seeding Four 100 GeV/c muons (zero pileup) Carlo Civinini Red: All 6 steps (0-5) Black: Without steps 4 and 5 (pixelless seeding, recover high eta efficiency)

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 11 Issues: Iterative Tracking Iterative Tracking Studies - Efficiency and fake rates with pileup (no step 4, 5) Some asymmetry seen for efficiency at high eta Increasing the minimum number of hits per tracks from 3 may reduce the fake rate at high pileup ( as seen in Fast Sim with non-iterative tracking ) Need study/tuning of iterative tracking steps (and use quadruplet seeding) Carlo Civinini

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 12 Other Status Out-of-memory problems at high pileup (CMSSW_3_3_6) Full simulation crashes at about 2  cm -2 s -1 (cannot fix) Tracking in Fast simulation crashes at about 4  cm -2 s -1 due to limit on number of clusters in code (can fix up) Porting of upgrade simulation code to CMSSW_3_5_7 It is a SL5 release (SL4 will become obsolete at some point) Improvements in simulation code (especially Fast simulation) Ivan Reid has ported the Phase 1 upgrade code to 3_5_7, Harry still needs to test and put into CVS and tag Lower priority: We will use 3_3_6 for studies for the summer

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 13 Future Plan and Task List Plan of work for Phase 1 Technical Proposal (Produced by V.Chiochia and M.Mannelli with input from A.Tricomi and H.Cheung) 1. Increased 4th Layer Radius. (Motivations: Improve seed efficiency and quality, improve Tracking and HLT performance and increase robustness, improve Tracking performance in core of high-p T jets) 1.Define seeding strategy for 4 layers (pairs, triplets, quadruplets) in the framework of iterative tracking 2.Plot seeding efficiency and track parameter resolution (vs eta/p T ) at any iterative step and total 3.Study combinatorics: seed multiplicity, timing performance, cut optimization 4.Introduce luminosity-induced (readout) inefficiency in the first layer 5.TIB search window and combinatorics in TIB 1/2/3 6.Tracking performance in core of high-p T jets

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 14 Future Plan and Task List 2. Reduced innermost radius and new pixel cell size. (Motivations: Improve/extend b-jet tagging capabilities, secondary vertices, and tau reconstruction) 1.Compare with current 3-layer system 1.Track impact parameter resolution vs momentum 2.Primary and secondary vertex resolution, 3D flight distance resolution 3.b-tagging efficiency/purity 4.Evaluate ROC/TBM data rates 2.Modify readout pitch in first layer (e.g. 75  100  m 2 ) and compare to 4-layer system with standard pitch (100  150  m 2 ): 1.Pixel position resolution vs. impact parameter 2.Track impact parameter resolution vs. momentum 3.Primary and secondary vertex resolution, 3D flight distance resolution 4.b-tagging efficiency/purity 5.Seeding efficiency for dense environments (high p T jets, tau’s) 6.Evaluate data ROC/TBM data rates 3.Repeat some task in (2) for combination of smaller radius and smaller pixel cell size 1.Priority to data rates, b-tagging performance and seeding efficiency in dense jets (various Jet p T )

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 15 Future Plan and Task List 3. Reduced material budget. (Motivations: Improve Tracking efficiency and quality, reduce nuclear interactions, electron bremsstrahlung and photon conversions) 1.Compare with current 3-layer system 1.Tracking efficiency and fake rate (e.g. efficiency for pion reconstructions 2.Number of photon conversions and nuclear interactions vs radius 3.Benchmarks of electron reconstruction 4. Technical Tasks. (Motivation: More accurate (useful) simulation results) 1.Improve material budget 2.Improve hit position and error (correlation with pixel size) 3.Improve matching of Fast sim tracker occupancies with Full sim (and data) 4.Implement geometry with increased larger radius

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 16 Future Plan and Task List Priorities and Manpower for tasks We are now starting to focus on this task list: Effort already on-going in some of the tasks but need more focus on the end product Signing-up and assigning people to tasks (please Alessia and Harry), as well as putting down people already working on various studies Now milestones for end of June (Draft Technical Proposal), and end of summer/September(?) (Final version) - backup claims with MC studies We need to prioritize –Lowest priority for “1. Increased 4th Layer Radius” studies –Need to work on “4. Technical Tasks” while currently enabling meaningful simulation studies for tasks 2 and 3. We should use Full simulation (less issues) Need effort on MC production samples (will coordinate with Dave Newbold) –Requires new pileup min-bias files for each geometry variation We will evaluate after we put down current people against tasks, but likely will need more effort to meet summer milestones

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 17 Current Simulation Studies Meeting agenda Results and progress for latest Phase 1 simulations: Redoing many of the previous studies and more with new Phase 1 geometry and with CMSSW_3_3_6 (not yet aligned with corresponding tasks in list)

Tracker Upgrade Simulations Meeting, 28 April 2010 H. W. K. Cheung (FNAL) 18 Conclusion We can start meaningful Phase 1 Simulation Studies We should use the Full Simulation where possible Some improvements are however needed: –Improve/fix BPIX material description; Put in FPIX services –Code hit position and error routine for upgrade geometry We need to start a MC production effort We have a simulation studies list to focus on Need to prioritize the list and find enough manpower resources Should coordinate with other Phase 1 simulation studies (via Upgrade Physics Coordinator - S. Dasu)