MuTr LL1 simulation

Kazuya Aoki

Kyoto Univ.

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

MuTr LL1

MuTr

Amp-shaper-discri

Programmable Circuit(FPGA)

signal

Hit pattern

MuTr LL1

MuTr test chamber at Kyoto.

１４０ｃｍ

Cosmic ray

choose hit strip

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

二値化

REAL DATAco

unts

The difference

char

ge

Discri.

Choose the center stripAs the hit

Thresh.

Algorithm

1. Making lookup table for station1 & 3

2. Calculate sagitta and make a decision!

INPUT: single 15GeV/c vertex z=0

-

+

sagitta: the difference between The actual hit at station#2 and interpolated position

1.Making lookup table For each strip at St#1

get hit strip dist. at St#3 Fit with gaus func. get lower and upper limit

(+/- 3 from mean)

To reduce the data size Collect all lower and upper li

mits and fit with straight line

INPUT: single 15GeV/c vertex z=0

-

+

lower limit

Upper limit

For each strip at St#1

Lower limit

Upper limit

Fit with straight line

Simulation procedure(event generator) Software and PDF

PYTHIA Ver6 CTEQ5M1

Settings for background <kT>=2.5GeV/c , kT<10GeV/c MSEL=2(MinBias : total ) No cuts applied 1M events Agrees well with UA1 data

Settings for signal MSEL=12 Cuts applied

W should decay into The should have PT>20GeV/c an

d -1.2>>-2.2 or 1.2<<2.4 50k events

pp sqrt s = 200GeV

pp sqrt s = 500GeV

Inclusive charged hadron pT spectra

Simulation procedurePISA

Vertex distribution rms of z = 17

Run Number = 92446 Dead area due to FEMs included Dead area due to HV NOT INCLUDED

( if you use Run Number -1 the induced charge is too large compared to the real data.)

BBC Z vertexRUN92446(REAL DATA)

Fitted func.(gaus)

Definitions

Rejection Factor

Efficiency

MinBias(Total )

# of triggered events (MuTrLL1 X MuIDLL1)

# of triggered events (MuTrLL1 x MuIDLl1)W decays into which satisfy the following:pT>20GeV/c and -1.2>>-2.2 or 1.2<<2.4

Rejection & Efficiency

str<=1 str<=2 str<=3

Rej 23700 +-3450 10900 +- 1170 7180 +- 625

Eff 66% 66% 66%

MuTr x MuID MuIDLL1 only

Rej 3200+-260 241 +-4

Eff 70% 95%

Eff = [MuIDLL1] x [MuTr acc] x [MuTr plane eff.] X [MuTr live area]

= 66%

95% 79% 96%

Using only 2 stations

Using 3 stations ( MuTr LL1 x MuID LL1)

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?