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MuGirl – a muon identification package

MuGirl – a muon identification package. S. Tarem 1,2 , Z. Tarem 2 , N. Panikashvili 1,3 , D. Primor 4 1 Technion, 2 CERN, 3 U. of Michigan, 4 Tel Aviv U. Algorithm flow. Initialize Muon candidate from ID track parameters Extrapolate track to Muon Spectrometer chambers

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MuGirl – a muon identification package

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  1. MuGirl – a muon identification package S. Tarem1,2,Z. Tarem2, N. Panikashvili1,3 , D. Primor4 1Technion, 2CERN, 3U. of Michigan, 4Tel Aviv U.

  2. Algorithm flow • Initialize Muon candidate from ID track parameters • Extrapolate track to Muon Spectrometer chambers • Look for hits in a road around the track extrapolation • Make segments from hits • Improve extrapolation by using segment information • Collect hit & segment information to identify muon • ANN to create one figure of merit • Select “muon like” candidates • Cut values on lowest pT & ANN output are job options

  3. Replacing the MuidLowPt algorithm • A new package is under development • Run independently of MOORE/Muid • Improved extrapolation • TGC/RPC segments • MDT segments using Hough transform – D. Primor • CSC segments using Hough transform – D. Primor & N. Amram • ANN used to combine program outputs into one optimal discriminator • Radically improved SW design • Component based, modular, reusable, documented…. • Uses new Muon EDM • Will replace program MuidLowPt from release 12

  4. Where to look for hits • Extrapolation from ID, chamber selection, extrapolate to chamber RegionSelector RegionSelector

  5. Segment making (TGC) • TGC has • 2 layers in the inner station – can measure a point • Only partial geometric coverage • 7/6 layers in the middle station – can measure a segment • Nothing in the outer station • TGC segments made using hits with 2<10 • Interpolation from TGC segments to MDT • If too few points for segment, the measured position is used with direction taken from extrapolated ID track • Improvement in road width

  6. Hits and extrapolations

  7. Roads from ID vs roads from TGC • Δη between extrapolated position and hit MDT tube • Inner station Middle station Outer station • extrapolated • from middle 6 6 20 20 20

  8. Barrel ID vs MDT segment • Δη between extrapolated position and hit MDT tube • Inner station Middle station 20

  9. Segment making (MDT) • Use Didi’s Hough transform segment maker • Interface sends RIO_OnTrack in 2 vectors (chambers) • Will return lower quality segment if just one multilayer • Modified interface to send also road parameters • Get back MuonSegment – quality factor more than just 2

  10. Preliminary performance • We ran on DC3 validation files of • H4 • Some single muons • BsJ/Ψ(μ3μ6) φ • bbμ6 X • A few selections attempted • efficiency/fake-rate calculated pT Fake rate η efficiency

  11. Number of MDT segments per candidate

  12. Performance for J/Ψ(μ3μ6) • Right – MuidLowPt • Bottom – MuGirl • Background bbμ6 X • Low background statistics J/Ψ μ+μ- μ-fake

  13. Plans • Complete unfinished features from slide 3 • RPC segments • CSC segments using Hough transform • ANN used to combine program outputs into one optimal discriminator • Make a thorough test of performance with cavern background etc. • Try it on more Physics samples • RTT • New package structure

  14. Backup

  15. More on fakes • Do we have fakes from k/pi decays? How can we eliminate them • We looked at the change of direction (in eta for now) from the ID track to the TGC segment for muons and fakes Muons fakes

  16. μ μ Recall MuidLowPt – our old program • Running after MOORE & Muid, using Muon hits  MDTRPC/TGC + + + + + + + + + + +  + + + + + + + + + + + +

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