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MuTr LL1 simulation

This study explores the MuTr LL1 simulation setup at Kyoto University, utilizing three stations with radial strips and a cathode plane for effective cosmic ray detection. We analyze the hit pattern through a programmable FPGA circuit, focusing on induced charge in multiple consecutive strips. The simulation leverages PYTHIA for event generation, validating results with UA1 data and evaluating trigger efficiency across different parameters. Key findings indicate that employing three stations enhances resolution and efficiency while suggesting that wire readouts may improve data accuracy.

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MuTr LL1 simulation

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  1. MuTr LL1 simulation Kazuya Aoki Kyoto Univ.

  2. MuTr LL1 overview • Using 3 stations (radial strips) • one cathode plane from each station • No Anode wire readout • MuTrLL1 X MuIDLL1 in GL1 level • No MuID road (symset) matching

  3. Cosmic ray MuTr LL1 MuTr signal MuTr test chamber at Kyoto. Amp-shaper-discri Hit pattern Programmable Circuit (FPGA) MuTr LL1 １４０ｃｍ

  4. choose hit strip charge 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 • This is gives enough resolution Thresh. Choose the center strip As the hit REAL DATA counts The difference

  5. Algorithm m+ m- • Making lookup table for station1 & 3 • Calculate sagitta and make a decision! INPUT: single m 15GeV/c vertex z=0 sagitta: the difference between The actual hit at station#2 and interpolated position

  6. 1.Making lookup table m+ m- • For each strip at St#1 • get hit strip dist. at St#3 • Fit with gaus func. • get lower and upper limit • (+/- 3s from mean) • To reduce the data size • Collect all lower and upper limits and fit with straight line INPUT: single m 15GeV/c vertex z=0 For each strip at St#1 Upper limit lower limit Upper limit Fit with straight line Lower limit

  7. Simulation procedure(event generator) 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

  8. Simulation procedurePISA Fitted func. (gaus) • Vertex distribution • rms of z = 17 • Run Number = 92446 • Dead area due to FEMs included • Dead area due to HV NOT INCLUDED BBC Z vertex RUN92446(REAL DATA) ( if you use Run Number -1 the induced charge is too large compared to the real data.)

  9. MinBias(Total s) # of triggered events (MuTrLL1 X MuIDLL1) Definitions • Rejection Factor • Efficiency # of triggered events (MuTrLL1 x MuIDLl1) W decays into m which satisfy the following: pT>20GeV/c and -1.2>h>-2.2 or 1.2<h<2.4

  10. Rejection & Efficiency Using only 2 stations Using 3 stations ( MuTr LL1 x MuID LL1) Eff = [MuIDLL1] x [MuTr acc] x [MuTr plane eff.] X [MuTr live area] = 66% 95% 79% 96%

  11. Conclusion • Using 3 stations • We can get enough RF ( 23700 ) • Reading Anode wires might help to some extent when we only read 2 stations. • How can I get the indeced charge in wires?

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