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Muon Level-2 Outline Level-1 / Level-2 Muon-ID Example Algorithm Performance

A. Maciel (N.I.U.) Muon-L2. The Level-2 Muon Trigger. ITEP -- LMU(Munich) -- Nevis Labs -- NIU. Arthur Maciel (N.I.U.) For The D Ø b-ID Vertical Review; FNAL 04-04-01. Muon Level-2 Outline Level-1 / Level-2 Muon-ID Example Algorithm Performance. A. Maciel (N.I.U.) Muon-L2.

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Muon Level-2 Outline Level-1 / Level-2 Muon-ID Example Algorithm Performance

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  1. A. Maciel (N.I.U.) Muon-L2 The Level-2 Muon Trigger ITEP -- LMU(Munich) -- Nevis Labs -- NIU Arthur Maciel (N.I.U.) For The DØ b-ID Vertical Review; FNAL 04-04-01 • Muon Level-2 Outline • Level-1 / Level-2 Muon-ID • Example Algorithm • Performance

  2. A. Maciel (N.I.U.) Muon-L2 Muon Level-2 Outline Data processing happens in three stages; (1) SLIC’s (track segment finding) (C-code on T.I. DSP’s) INPUTPROCESSINGOUTPUT Muon Front End Data L1 Data Pattern Recognition Re-Format A - Layer Track Stubs BC-Layer Track Stubs L1-objects (+Aphi) (2)ALPHA preprocessor (track assembly) (C++ on Linux) Compare all SLIC reported objects, search for matches Assemble matches (or singles) into final L2 muon candidates Report track params. and ID-quality to L2(global) and L3(seeds) (3) GLOBAL Level-2 (trigger decisions) (C++ on Linux) • Relate muon L2 candidates to other L2 objects, report triggers

  3. Pre-Global muon ID is based on muon system only, no cross referencing among different subdetectors (L1 CFT Pt-thresh). Track segment finding for A and BC layers separately. Run1 Pt. Segments built from both wire and scintillator elements. Calib: central wires have drift and φ(ΔT), Scints are T0 subtracted. L2 reports single-cell-wide 3D tracks in (Pt,η,φ) coordinates. Central PDT (A)segments must satisfy track residual requirements. No vertexing, but hit patterns must be compatible with int. region. Added resolution (over L1) in track counting, pointing and timing. L2 candidate searches are not biased by or related to L1 results. A. Maciel (N.I.U.) Muon-L2 Overview of Muon L2 Algorithms

  4. A. Maciel (N.I.U.) Muon-L2 L2-Global Muon Candidates • Global L2 has two main functions; object selection and object relations(objects: Jet,EM,MEt,MU,TRK,IP) • Muon selection; (Number, Pt, h-range, Quality) • Muon relations; • Angular separation, Dimuon mass [CFT resolution] • Isolation, muon inside jet, track match (Pt,η,φ), IP • Global can request object matches, but cannot do track re-fits, or ID building beyond CFT(Pt,η,φ) • Muon candidates sent to Global are also sent to L3 as seeds for data (detector module) unpacking ALPHA

  5. Overview of the L2mu Software Project C & Asm C ++ • SLIC Driver: • Init / Config / Test Suite • Soft & Hard Resets, SCL init. • Run control & monitoring • ALPHAS: • Worker ; Gen.Strategy, • finalize formats • Administrator&Global • (expecting a free ride) 1 5 • DSP-OS: • Boot Kernel (Init /Config /Test) • Data I/O ; driver and interrupts • Data I/O ; memory management 2 • Simulator: • Framework • Raw  L2 data • DSPs and Alpha 6 • DSP-Alg: • Interface w/ mem. management • (A,BC)x(Central,Forward) , L1 • Error handlers, Monitoring 3 • MC Studies: • Backgrounds • A-layer punch • Thin region punch • Halo and Multip.Int. • (unmatched stubs) • Eff./Rej./Rates • L2 (Pt,η,φ) resolution 7 • DSP-5: • Event sort/build/format • Full readout events, M&P • Monitoring interface w/ VME 4 A. Maciel (N.I.U.) Muon-L2

  6. A. Maciel (N.I.U.) Muon-L2 The Level-2 Muon Trigger ITEP -- LMU(Munich) -- Nevis Labs -- NIU Arthur Maciel (N.I.U.) For The DØ b-ID Vertical Review; FNAL 04-04-01 • Muon Level-2 Outline • Level-1 / Level-2 Muon-ID • Example Algorithm • Performance

  7. A. Maciel (NIU) L2 muon L2 Muon ID L1 MTC05 MTC10 L2; SLIC+ALPHA • 3D track resolution (counting) • A & BC segments separately A (3/4 hits) BC (3/6 hits) • A & BC crossing octants • High PT A-layer w/out BC • η dependence of hit patterns (pointing to interaction region) • simultaneous look at 2 or 3 scintillator times on track region wide scint match (φ wedge) octant wide scint match (η wedge) CFT φ wedge PDT centroid SLICs receive calibed data from Front Ends; PDT drift distances and phi (1st T-pair only) SCT T0-subtracted times (w.r.to tile center) MDT hit addresses only, no drifts. and From L1; MTC05, MTC10, MTM, MCEN... No cross referencing among different subdetectors before Global-L2 (except L1 CFT-confirm & thres.) Run-1 muon PT (from toroid only) No (muon) Z-vertex point back

  8. L1 L2 L3 5 MHz 10 KHz 1 KHz 20 Hz ~Expected L1 Muon Rates (KHz) L1 muon bandwidth ~few KHz • We can expect a rate reduction 2 from tracking • Extra rejection can come from; • Tighter time gates • Event-wide inspection L2 > ~ single track L2 is both an object-ID trigger and a physics trigger

  9. L2Impact on L1 Muon-ID • Smallest granularity 3D tracking, improved wire-scint and L-L correl • More accurate object counting; removes multiple triggers (stubs) resolves closely spaced tracks • Pt matching to L1 threshold • Narrower rejection time gate • Scint-TOF discrimination for Prompt - Slow - Out of Time • Recover crossing octant tracks • η dependence of hit patterns L1 Muon ID MTC05 non-CFT fwd. region wide scint match (φ wedge) CFT φ wedge dimuons MTC10 punch calib octant wide scint match (η wedge) MSP searches (Pt,η,φ) PDT centroid pointing A. Maciel (N.I.U.) Muon-L2

  10. A. Maciel (N.I.U.) Muon-L2 Comments for L3 • “Muon-subdetector-only” ID largely done @L2 • Exploit other subdetectors ! • Muon vertex - MTC vertex - min.H vertex; is the muon vertex compatible with the rest of the event ? (multiple interactions) • Kinematics refitting, dimuon masses, reln to other phys. objects • Back to back tracks - correlate scint times (low Pt dimuons) • Number of hits on track (L2 fixed @6) - combinatorics(fwd) T

  11. A. Maciel (N.I.U.) Muon-L2 The Level-2 Muon Trigger ITEP -- LMU(Munich) -- Nevis Labs -- NIU Arthur Maciel (N.I.U.) For The DØ b-ID Vertical Review; FNAL 04-04-01 • Muon Level-2 Outline • Level-1 / Level-2 Muon-ID • Example Algorithm • Performance

  12. A. Maciel (N.I.U.) Muon-L2 SLIC Algorithms Central A Layer Ave. time budget = 25 µs • Sweep octant in search for wire triplets • check that matching z-row has been hit • check triplet validity, calculate residual • assign scint time and phi, wire eta • report stub, continue octant sweep • Track stub finding (wire+scint) • driven by lookup tables with: • valid wire hit patterns • wire geometry for track fit • valid wire-scint correlations Scint. z-rows PDT A 3x4 Search Window beam line PDT hit triplet obs: wire-only or scint-only stubs are not being considered

  13. A. Maciel (N.I.U.) Muon-L2 L2 Muon 3D Track Pointing Valid hit-triplet Patterns are listed on a lookup table Table has η dependence. One A-layer octant holds 40 valid patterns. At each η, only up to 18max. are possibly valid. Track receives a detector(η,φ) Track η is given by innermost cell Track φ is given by Aφ or Pixel PDT ΔT (triplet average) resolves doubles sigma = 0.09 LSB(η) = 0.05

  14. A Layer Track Segment dout Requiring 3 cells hit (out of max.=4) y PDT Hit Triplet. Wire Positions are; ( z , y ) for cells in , mid , out d = Signed Drift Distances Hit Position = ( z+d , y ) dmid din z The straight line segment constraint det zi + di zm + dm zo + do = 0 yi ym yo 1 1 1 determines a track stub residual equation for the drift times, co | d | + Offset = Res(dim L) where… A. Maciel (N.I.U.) Muon-L2

  15. A. Maciel (N.I.U.) Muon-L2 Track Stub Residual Equation co | d | + Offset = Res(dim L) Offsets are in 1 1 correspondence with Triplet “patterns” Offset = 1 zo zm zi yo – yi yo ym yi 1 1 1 Cout= sign x (ym – yi) / (yo – yi) Cin= sign x (yo – ym) / (yo – yi) Cmid= sign x -1 Coefficients are in 1 1 correspondence with missing deck # PDT triggering must test residuals over all valid sign combinations

  16. A. Maciel (N.I.U.) Muon-L2 The Level-2 Muon Trigger ITEP -- LMU(Munich) -- Nevis Labs -- NIU Arthur Maciel (N.I.U.) For The DØ b-ID Vertical Review; FNAL 04-04-01 • Muon Level-2 Outline • Level-1 / Level-2 Muon-ID • Example Algorithm • Performance

  17. A. Maciel (N.I.U.) Muon-L2 DSP Evaluation DSP Timing • Trigger code in assembly format • Download trigger code and tables • Each A layer DSP holds one octant • Code and tables are octant specific • Timing is for single track events • Backgnd: 5% random hits added • DSP internal memory has 64kB • Code and table have ~20kB each • DSP management code under study • SLIC: 4 worker DSPs, one manager • Central-A: 8 DSPs in parallel • Central-BC: 8 SLICs in parallel search all search one window sweep µsec

  18. The L2 – Muon Object Finding 3x4 Search Window A-layer PDT For each search window, find all valid hit triplets, deck ordered inside out. Each triplet is tested against trigger table for track segment and drift residual (here no scintillator match) A. Maciel (N.I.U.) Muon-L2

  19. A. Maciel (N.I.U.) Muon-L2 Central A-Layer PDT ROAD = + 009 - 011 - 013 +015 Triplet = +009 –013 +015 ; Pattern = 0,0,1 y . . . column 95 * * 6 7 14 15 15 4 5 12 * 13 28 Four decks . . * 2 3 10 11 26 . . . 24 columns 1 1 8 9 * 24 * 89 Cell 0 Coln 0 Col_in = 3 Barrel = 1 , 2 , 3 z ROAD = + 025 + 026 - 028 +030 Triplet = +017 +018 +022 ; Pattern= -1,-1, 2 A triplet “pattern” is defined as two cell projections, and the missing deck number Nb; patterns are triplet shapes, and have Z – translation invariance

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