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Rejection Power of MuTr LL1

Rejection Power of MuTr LL1. Kazuya Aoki Kyoto Univ. Forward upgrade meeting Aug18,2004. CONTENTS. Required Rejection Factor MuTr LL1 idea Estimated Rejection Factor and efficiency of MuTr LL1 Simulation procedure Parameter dependence of RF Real VS Simulation (@200GeV)

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Rejection Power of MuTr LL1

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  1. Rejection Power of MuTr LL1 Kazuya Aoki Kyoto Univ. Forward upgrade meeting Aug18,2004

  2. CONTENTS • Required Rejection Factor • MuTr LL1 idea • Estimated Rejection Factor and efficiency of MuTr LL1 • Simulation procedure • Parameter dependence of RF • Real VS Simulation (@200GeV) • RF and eff of MuTr LL1 @500GeV • Turn off inner MuID tubes to get higher RF • RF ( @200 GeV ) Eff ( @500GeV )

  3. トリガーレート = 48kHz m momentum dist. Required RF Design Lumi √s = 500 GeV σ=60mb L = 2x1032/cm2/s signal PT>10GeV/c Total X-sec rate＝12MHz REAL DATA DAQ LIMIT =2kHz （for μ arm） ２５ ５０ Momentum GeV/c Required RF ６０００ NEW trigger: Reject low momentum μ BUT MuID LL1 triggered evts. Dominated by Decay m (~several GeV/c) MuID LL1 RF=250

  4. MuTr LL1 - basic idea • Accept high momentum tracks. • Measure sagitta using hits at station 1,2 and 3 • Read out 1 / 1 / 1 planes for LL1 • We have 6 / 6 / 4 planes in MuTr • Read out non-stereo type planes Non-stereo sagitta: the difference between The actual hit at station#2 and interpolated position

  5. MuTr LL1 - electronics ~1usec AMU ADC data For offline analysis MuTr Cathode CPA (Cathode PreAmp) BBCLL1 GL1 MuIDLL1 Analog out shaper Hit pattern Amp FPGA (MuTrLL1) Discri ~80nsec MuTr LL1 electronics

  6. m+ MuTr LL1 - algorithm • for a hit at station #1 , search at least one hit at station#3 within the search window. m- Strips at Station 1 Strips at Station 3 Strips at Station 2 INPUT: single m 15GeV/c vertex z=0 accept Dstrip<=1 ~25 Dstrip :Sagitta at station 2

  7. Estimated Rejection Factor and efficiency of MuTr LL1 • Simulation procedure • Parameter dependence of RF • Real VS Simulation (@200GeV) • RF and Eff of MuTr LL1 @500GeV

  8. Simulation procedure PYTHIA • MinBias events for RF estimate • W events for Eff estimate PISA Response chain Hit information of strips Trigger simulator

  9. PYTHIA generated events Inclusive charged hadron pT spectra • Software and PDF • PYTHIA Ver6 • CTEQ5M1 • Settings for background • <kT>=2.5GeV/c , kT<10GeV/c • MSEL=2(MinBias : total s) • No cuts applied • 1M events • Agrees well with UA1 data • Settings for signal • MSEL=12 • Cuts applied • W should decay into m • The m should have PT>20GeV/c and -1.2>h>-2.2 or 1.2<h<2.4 • 50k events pp sqrt s = 200GeV pp sqrt s = 500GeV

  10. Vertex distribution • Vertex distribution • rms of z = 17 Fitted func. (gaus) BBC Z vertex RUN92446(REAL DATA)

  11. Parameter dependence of RFMuID LL1 RF(dependence on PDF and <kT>) pp 500GeV pp 200GeV Tube eff = 90% Without BBCLL1 ~1.5 Tube eff = 97% Without BBCLL1 Poor statistics.

  12. ~1.5 times larger

  13. Real VS Simulation@ sqrt(s)=200GeV • REAL DATA( offline value ) , simulation • During RUN3 , threshold for south tubes are higher than usual. Simulation included this effect by putting tube-eff file into PISA. South : agree , fluctuation North : sim higher than real Sim is better for LL1 Real and sim agree within factor of 2

  14. Rejection & Efficiency @ 500GeV Using only 2 stations Using 3 stations ( MuTr LL1 x MuID LL1) Enough rejection factor. Good efficiency 3 Eff = [MuIDLL1] x [MuTr acc] x [MuTr trigger plane eff.] = 66% 95% 79% 96% Dstrip :Sagitta at station 2

  15. Turn-on curve # of muons / MuIDLL1 x muons hit all chamber 2600 3200 23700 Input : single muon – flat mom dist.

  16. Turn off inner MuID tubes • Turn off inner 10 tubes • Except north horizontal panel 1  15 tubes

  17. RUN3 pp (RUN92446) Turn off inner MuID Tube SOUTH NORTH • Roads’ gap0 position distribution 10 tubes 15 tubes PLEASE NOTE: my procedure to turn off tubes only have influence on trigger decision. not on road finder. So there are still many hits.

  18. Turn off inner MuID tubes • Efficiency pp 200GeV RUN3(RUN 92446) BBCLL1 triggered evts. Simulation @500GeV • Rejection Factor x 4.7 +- 0.4 x 1.9 +- 0.25 x 3.7 +- 0.26 Not enough RF achieved

  19. summary • MuTr LL1 x MuIDLL1 • RF = 23700 @ 500GeV • Eff = 66% • Enough rejection factor we can achive. • MuID LL1 RF depends on parameters. • My recommendation: CTEQ5M1 with <kT>=2.5 • MuID inner tube off • Inner 10 tubes are off • RF = 535 : not enough

  20. charge choose hit strip 二値化 Discri. • Charge is induced 2 or 3 consecutive strips. • Discriminate the signals • Choose the center strip as the hit • The difference between peak strip and center strip is <=1 Thresh. Choose the center strip As the hit REAL DATA counts The difference

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