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Muon subgroup simulation report

This report outlines the efforts to validate the magnet setup for muon measurements in Drell-Yan (DY) processes. Led by Maria Pia Bussa from ITEP, it discusses various aspects, including the layout studies for dimuon detection, background studies using PYTHIA, and the design of the barrel and endcap detectors. The findings highlight rejection factors for tracking primary and secondary muons, as well as strategies for optimizing detector layers. The report emphasizes the need for further simulations to enhance background rejection and validate results across different generators.

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Muon subgroup simulation report

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  1. Muon subgroup simulation report • Status report on Torino studies • to validate the magnet setup • for muon measurement in DY processes Maria Pia Bussa, ITEP 18/4/2008

  2. MC data samples • in real life m/p = 10-6 • layout studies for dimuon with ABDYG (1.5 MEv) • background studies with PYTHIA (640 KEv) • all interactions switched on Maria Pia Bussa, ITEP 18/4/2008

  3. ABianconi Drell - Yan Generator Benchmark channel: DY @ 15 GeV/c Focus on one single Mμμ range 1.5 < M μμ< 2.5 GeV 1 nb cross section Maria Pia Bussa, ITEP 18/4/2008

  4. New design with more filtering after the endcap Maria Pia Bussa, ITEP 18/4/2008

  5. Barrel design for the simulation • Detector simulated by 3 cm ArCO2 • Muon filter: iron plates 3/6 cm thickness • 9 iron plates 3 cm, inner and outer plates 6 cm, 12 detector layers • Fe equivalent 39 cm Maria Pia Bussa, ITEP 18/4/2008

  6. Endcap design for the simulation • Detector simulated by 2 cm ArCO2 • Muon filter: iron plates 4/6 cm thickness • 6 iron plates with 7 detector layers • Fe equivalent 34 cm • Additional iron: 10 cm thick, followed by virtual detector plane Maria Pia Bussa, ITEP 18/4/2008

  7. additional iron after the endcap additional iron endcap Primary pions, no mm mass cut Maria Pia Bussa, ITEP 18/4/2008

  8. Background and signal kinematics @ vertex bkg dipions barrel endcap DY dimuons Maria Pia Bussa, ITEP 18/4/2008

  9. Bkg and signal kinematics @ B/E entrance (1.5 < Mμμ < 2.5 GeV/c2) bkg pions endcap barrel DY muons Maria Pia Bussa, ITEP 18/4/2008

  10. ABDYG signal distribution exit Barrel = 40 cm Fe eq. exit Endcap = 64 cm Fe eq. 10% DY signal with one m in FS at the exit Maria Pia Bussa, ITEP 18/4/2008

  11. Dipion background distribution normalized to the total number of events • 96% dipion cut by material budget before entrance • at exit E : E+FS : FS = 1 : 2 : 2 Maria Pia Bussa, ITEP 18/4/2008

  12. Primary dipion background rejection in Fe Weak effect with Fe depth in Endcap, better in Barrel Maria Pia Bussa, ITEP 18/4/2008

  13. dimuon/primary dipion ratio 30 cm additional Fe  factor 3 Additional cuts from Range System & kinematics e.g. cut on PT  factor > 10 expected March 3, 2008 Marco Maggiora - Muon @ GSI 03/2008 13 Maria Pia Bussa, ITEP 18/4/2008

  14. background from secondaries m&p distribution Exit  40 cm Fe equiv in Barrel, 64 cm in Endcap Background survives in Endcap Weak effect of additional Fe Maria Pia Bussa, ITEP 18/4/2008

  15. Hadronic secondary background Fe rejections Hadronic primary background Maria Pia Bussa, ITEP 18/4/2008

  16. CONCLUSIONS • Barrel rejection factor per track: 5 103 • Endcap rejection factor per track: 102 (5 102 after 94 cm) • Barrel rejection factor considering couples: > 106 (40cm Fe) • Endcap rejection factor considering couples: 1.5 105 (after 64cm of Fe; 30cm more lead to 5 105 only) • These rejection factors include primary pions and secondary muons from pions.. • One order of magnitude is missing; extrensive simulations needed on PANDAGRID to design topological and kinematic cuts! • Porting on PANDROOT well on his way Maria Pia Bussa, ITEP 18/4/2008

  17. next steps • Barrel: the desired bkg suppression seems achievable with segmented yoke • Endcap: muon filtering improved with the suggested additional iron after the endcap • Simulation needed for muons from pion decay and to optimize the number of detector layers • Simulations are also needed for other muonic channels • Is the result depending on bkg generator? A cross check with DPM asap Maria Pia Bussa, ITEP 18/4/2008

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