K.Fujii @ LC-TPC TPC R&D Meeting
Time Stamping
CDC/TPC Comparison Studies
Keisuke Fujii, KEK
1
K.Fujii @ LC-TPC TPC R&D Meeting
Why Time Stamping?
2
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
@100/120Hz
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
@100/120Hz
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
@100/120Hz
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
@100/120Hz
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
Confusion in topology recognition
in chamber acceptance
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
Confusion in topology recognition
Degradation of M-jet resolution
3
K.Fujii @ LC-TPC TPC R&D Meeting
JLC/NLC Bunch Structure and Min-Jet BG
1.4ns x 192 bunches
1.4ns
........
!
max
Ldrift /vdrift
@100/120Hz
All the tracks will be recorded
as from a single event
2-Photon Mini-Jet Production
!E" # 2.5 GeV
!nch " # 5
in chamber acceptance
Confusion in topology recognition
Degradation of M-jet resolution
........
3
K.Fujii @ LC-TPC TPC R&D Meeting
How to Time-Stamp
a Track?
4
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
∆x
∆x
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
∆x
∆x = 2 vdrift × ∆T0
∆x
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
∆x
∆x = 2 vdrift × ∆T0
Naively we expect
∆x
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
∆x
∆x = 2 vdrift × ∆T0
Naively we expect
σ∆T0 !
σxy
√
vdrift n
∆x
5
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of JLC-CDC
Staggered Cells
Wrong T0 breaks a track!
∆x
∆x = 2 vdrift × ∆T0
Naively we expect
σ∆T0 !
∆x
σxy
√
vdrift n
σxy = 85 µm
vdrift = 0.7 cm/µs
n = 50
σ∆T0 ! 1.7 ns
5
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
L
d
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
L
d
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
L
d
IP
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
d
IP
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
d
IP
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
d
∆z
IP
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
d
∆z
IP
6
In the Case of TPC
K.Fujii @ LC-TPC TPC R&D Meeting
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
IP
6
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
IP
σ∆T0
!
" #
" #2 $− 21
d
d
2σz
√ 1+3
!
+3
L
L
vdrift n
6
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
IP
σ∆T0
!
" #
" #2 $− 21
d
d
2σz
√ 1+3
!
+3
L
L
vdrift n
!
2σz
√
vdrift n
if
! "
d
!1
L
6
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
σ∆T0
IP
Assuming that Z resolution of the
external detector is negligible
!
" #
" #2 $− 21
d
d
2σz
√ 1+3
!
+3
L
L
vdrift n
!
2σz
√
vdrift n
if
! "
d
!1
L
6
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
σ∆T0
IP
Assuming that Z resolution of the
external detector is negligible
!
" #
" #2 $− 21
d
d
2σz
√ 1+3
!
+3
L
L
vdrift n
!
2σz
√
vdrift n
if
! "
d
!1
L
σz = 500 µm
vdrift = 5 cm/µs
n = 120
6
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
External Z Detector (T0 Device)
Wrong T0 makes a Z-shift!
L
∆z = vdrift × ∆T0
Naively we expect
d
∆z
σ∆T0
IP
Assuming that Z resolution of the
external detector is negligible
!
" #
" #2 $− 21
d
d
2σz
√ 1+3
!
+3
L
L
vdrift n
!
2σz
√
vdrift n
if
! "
d
!1
L
σz = 500 µm
vdrift = 5 cm/µs
n = 120
σ∆T0 ! 2.0 ns
6
K.Fujii @ LC-TPC TPC R&D Meeting
More Realistic
Estimation
Helix Fit CDC Hits with T0
as an Additional Fit Parameter
7
CDC Case
K.Fujii @ LC-TPC TPC R&D Meeting
8
CDC Case
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial only)
8
CDC Case
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial only)
hChi2
2409
Entries
Mean
94.23
RMS
13.71
300
250
Helix Fit with T0=21ns
200
χ2 distribution for
ndf = 50 ×2-6=94
mean = ndf = 94
RMS = 2×ndf = 13.7
150
100
50
0
0
50
100
χ
2
150
200
250
8
CDC Case
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial only)
hChi2
2409
Entries
Mean
94.23
RMS
13.71
300
250
Helix Fit with T0=21ns
200
χ2 distribution for
ndf = 50 ×2-6=94
mean = ndf = 94
RMS = 2×ndf = 13.7
150
100
50
0
0
50
100
χ
2
150
200
250
Fit seems OK!
8
K.Fujii @ LC-TPC TPC R&D Meeting
9
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial only, 100GeV)
9
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial only, 100GeV)
Default 3T Configuration with σxy = 85 µm × 50 pts
180
160
140
120
100
80
σT0 = 1.75 ns
60
7ns
40
0ns
14ns
20
0
-10
-5
0
21ns
5
10
15
T0 from Fit [ns]
20
25
30
9
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial only, 100GeV)
Default 3T Configuration with σxy = 85 µm × 50 pts
180
160
140
120
100
80
σT0 = 1.75 ns
60
7ns
40
0ns
14ns
20
0
-10
-5
0
21ns
5
10
15
T0 from Fit [ns]
20
25
30
We can determine T0 with ~1.8ns accuracy as expected!
9
K.Fujii @ LC-TPC TPC R&D Meeting
What happens
if we add stereo layers?
At certain Z positions, we lose L/R staggering of
the neighboring layers!
Stereo layers allow additional freedom to eliminate
track discontinuity by adjusting dip angle!
----> Degradation of time stamping capability?
10
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial+stereo, 100GeV)
11
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial+stereo, 100GeV)
hChi2
2428
Entries
Mean
94.42
RMS
13.52
240
220
200
Helix Fit with T0=21ns
180
160
140
χ2 distribution for
ndf=50 ×2-6=94
mean=ndf=94
120
100
RMS= 2×ndf =13.7
80
60
40
20
0
0
50
100
χ2
150
200
250
11
K.Fujii @ LC-TPC TPC R&D Meeting
Chi2 Distribution (axial+stereo, 100GeV)
hChi2
2428
Entries
Mean
94.42
RMS
13.52
240
220
200
Helix Fit with T0=21ns
180
160
140
χ2 distribution for
ndf=50 ×2-6=94
mean=ndf=94
120
100
RMS= 2×ndf =13.7
80
60
40
20
0
0
50
100
χ2
150
200
250
Fit seems OK!
11
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial+stereo, 100GeV)
12
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial+stereo, 100GeV)
Default 3T Configuration with σxy = 85 µm × 50 pts
140
120
100
80
60
σT0=2.15ns
7ns
40
0ns
20
0
-10
-5
0
21ns
14ns
5
10
15
T0 from Fit [ns]
20
25
30
12
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (axial+stereo, 100GeV)
Default 3T Configuration with σxy = 85 µm × 50 pts
140
120
100
80
60
σT0=2.15ns
7ns
40
0ns
20
0
-10
-5
0
21ns
14ns
5
10
15
T0 from Fit [ns]
20
25
30
We can still determine T0 with ~2.2ns accuracy!
12
K.Fujii @ LC-TPC TPC R&D Meeting
What about
Low Pt Tracks?
13
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (axial+stereo, 1GeV)
14
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (axial+stereo, 1GeV)
κ ≡ 1/PT
1000
MS OFF
PT=1GeV
800
M.S. OFF
1600
1400
PT=1GeV
M.S. OFF
1200
600
-4
σκ=(2.01 ± 0.02) × 10
400
200
1000
σT0 =1.87ns
800
600
400
200
0
-0.005 -0.004 -0.003 -0.002 -0.001 0
0.001 0.002 0.003 0.004 0.005
-1
∆ κ [GeV ]
0
-10
-8
-6
-4
-2
0
2
T0 from Fit [ns]
4
6
8
10
14
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (axial+stereo, 1GeV)
κ ≡ 1/PT
1000
MS OFF
PT=1GeV
800
M.S. OFF
1600
1400
PT=1GeV
M.S. OFF
1200
600
1000
-4
σκ=(2.01 ± 0.02) × 10
σT0 =1.87ns
800
400
600
400
200
200
0
-0.005 -0.004 -0.003 -0.002 -0.001 0
0.001 0.002 0.003 0.004 0.005
-1
∆ κ [GeV ]
MS ON
900
800
-6
-4
-2
0
2
T0 from Fit [ns]
4
6
8
10
-2
0
2
T0 from Fit [ns]
4
6
8
10
PT=1GeV
1400
M.S. ON
M.S. ON
1200
600
400
-8
1600
PT=1GeV
700
500
0
-10
1000
σκ=(8.57 ± 0.6) × 10
-4
300
200
100
0
-0.005 -0.004 -0.003 -0.002 -0.001 0
0.001 0.002 0.003 0.004 0.005
-1
∆ κ [GeV ]
800
σT0=1.94ns
600
400
200
0
-10
-8
-6
-4
14
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (axial+stereo, 1GeV)
κ ≡ 1/PT
1000
MS OFF
PT=1GeV
800
M.S. OFF
1600
1400
PT=1GeV
M.S. OFF
1200
600
1000
-4
σκ=(2.01 ± 0.02) × 10
σT0 =1.87ns
800
400
600
400
200
200
0
-0.005 -0.004 -0.003 -0.002 -0.001 0
0.001 0.002 0.003 0.004 0.005
-1
∆ κ [GeV ]
MS ON
900
800
-6
-4
-2
0
2
T0 from Fit [ns]
4
-2
0
2
T0 from Fit [ns]
4
6
8
10
Only Small Effect on T0
PT=1GeV
1400
M.S. ON
M.S. ON
1200
600
400
-8
1600
PT=1GeV
700
500
0
-10
1000
σκ=(8.57 ± 0.6) × 10
-4
300
200
100
0
-0.005 -0.004 -0.003 -0.002 -0.001 0
0.001 0.002 0.003 0.004 0.005
-1
∆ κ [GeV ]
800
σT0=1.94ns
600
400
200
0
-10
-8
-6
-4
6
8
10
14
K.Fujii @ LC-TPC TPC R&D Meeting
In the Case of TPC
Assuming a generic TPC with
Rout − Rin = 120 cm
σxy = 150 µm
σz = 500 µm
B = 4T
n = 120
vdrift = 5 cm/µs
and a T0 device with
σzT0 = 10 µm
Helix Fit TPC hits Including the External Z Hit with
T0 as an Additional Fit Parameter
15
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (d=5cm, 100GeV)
16
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (d=5cm, 100GeV)
TPC with σz = 500 µm × 120 pts
160
140
120
100
80
σT0=2.00ns
60
7ns
40
0ns
20
0
-10
-5
0
21ns
14ns
5
10
15
T0 from Fit [ns]
20
25
30
16
K.Fujii @ LC-TPC TPC R&D Meeting
T0 from Helix Fit (d=5cm, 100GeV)
TPC with σz = 500 µm × 120 pts
160
140
120
100
80
σT0=2.00ns
60
7ns
40
0ns
20
0
-10
-5
0
21ns
14ns
5
10
15
T0 from Fit [ns]
20
25
30
We can determine T0 with ~2.0ns accuracy as expected!
16
K.Fujii @ LC-TPC TPC R&D Meeting
What about
Low Pt Tracks?
17
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
120
100
σT0 =2.0ns
80
60
40
Input T0
=14ns
20
0
0
5
10
15
T0 from Fit [ns]
20
25
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
TPC with σz = 500 µm × 120 pts
MS ON
PT=2GeV
120
M.S. ON
100
120
80
100
σT0 =2.0ns
80
60
60
40
40
Input T0
=14ns
20
0
σT0 =2.6ns
0
5
10
15
T0 from Fit [ns]
Input T0
=14ns
20
20
25
0
0
5
10
15
T0 from Fit [ns]
20
25
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
TPC with σz = 500 µm × 120 pts
MS ON
PT=2GeV
120
M.S. ON
100
120
80
100
σT0 =2.0ns
80
60
60
40
40
Input T0
=14ns
20
0
σT0 =2.6ns
0
5
10
15
T0 from Fit [ns]
Input T0
=14ns
20
20
25
0
0
5
10
15
T0 from Fit [ns]
20
25
MS Effect more significant than for CDC
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
TPC with σz = 500 µm × 120 pts
MS ON
PT=2GeV
120
M.S. ON
100
120
80
100
σT0 =2.0ns
80
60
60
40
40
Input T0
=14ns
20
0
σT0 =2.6ns
0
5
10
15
T0 from Fit [ns]
Input T0
=14ns
20
20
25
0
0
5
10
15
T0 from Fit [ns]
20
25
MS Effect more significant than for CDC
This is probably due to the fact that there is only a single
break point to decide T0.
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
TPC with σz = 500 µm × 120 pts
MS ON
PT=2GeV
120
M.S. ON
100
120
80
100
σT0 =2.0ns
80
60
60
40
40
Input T0
=14ns
20
0
σT0 =2.6ns
0
5
10
15
T0 from Fit [ns]
Input T0
=14ns
20
20
25
0
0
5
10
15
T0 from Fit [ns]
20
25
MS Effect more significant than for CDC
This is probably due to the fact that there is only a single
break point to decide T0.
The material thickness between TPC and T0 detector does not
matter as long as it stays just in front of the T0 detector.
18
K.Fujii @ LC-TPC TPC R&D Meeting
Multiple Scattering Effects (d=5cm,0.6%X0, 2GeV)
TPC with σz = 500 µm × 120 pts
160
MS OFF
PT=2GeV
M.S. OFF
140
TPC with σz = 500 µm × 120 pts
MS ON
PT=2GeV
120
M.S. ON
100
120
80
100
σT0 =2.0ns
80
60
60
40
40
Input T0
=14ns
20
0
σT0 =2.6ns
0
5
10
15
T0 from Fit [ns]
Input T0
=14ns
20
20
25
0
0
5
10
15
T0 from Fit [ns]
20
25
MS Effect more significant than for CDC
This is probably due to the fact that there is only a single
break point to decide T0.
The material thickness between TPC and T0 detector does not
matter as long as it stays just in front of the T0 detector.
0.6%X0 to 3.0%X0 --> 2% shift in T0 resolution
18
K.Fujii @ LC-TPC TPC R&D Meeting
Summary & Conclusions
19
K.Fujii @ LC-TPC TPC R&D Meeting
20
K.Fujii @ LC-TPC TPC R&D Meeting
We have just started CDC/TPC comparison
studies for time stamping capability.
20
K.Fujii @ LC-TPC TPC R&D Meeting
We have just started CDC/TPC comparison
studies for time stamping capability.
CDC alone can determine T0 on a track by
track basis with a time resolution of ~2ns.
20
K.Fujii @ LC-TPC TPC R&D Meeting
We have just started CDC/TPC comparison
studies for time stamping capability.
CDC alone can determine T0 on a track by
track basis with a time resolution of ~2ns.
The T0 resolution is rather insensitive to
multiple scattering.
20
K.Fujii @ LC-TPC TPC R&D Meeting
We have just started CDC/TPC comparison
studies for time stamping capability.
CDC alone can determine T0 on a track by
track basis with a time resolution of ~2ns.
The T0 resolution is rather insensitive to
multiple scattering.
TPC can determine T0 together with a T0
device with a similar precision.
20
K.Fujii @ LC-TPC TPC R&D Meeting
We have just started CDC/TPC comparison
studies for time stamping capability.
CDC alone can determine T0 on a track by
track basis with a time resolution of ~2ns.
The T0 resolution is rather insensitive to
multiple scattering.
TPC can determine T0 together with a T0
device with a similar precision.
Multiple scattering effect is, however,
more significant.
20
K.Fujii @ LC-TPC TPC R&D Meeting
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
Refinement of the mini-Jet BG estimate.
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
Refinement of the mini-Jet BG estimate.
Effect of curling up tracks.
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
Refinement of the mini-Jet BG estimate.
Effect of curling up tracks.
Effect is probably more serious for TPC
than for CDC.
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
Refinement of the mini-Jet BG estimate.
Effect of curling up tracks.
Effect is probably more serious for TPC
than for CDC.
Linking to VTXD to eliminate primary tracks
originating from a displaced vertex in Z.
21
K.Fujii @ LC-TPC TPC R&D Meeting
Further Studies
Refinement of the mini-Jet BG estimate.
Effect of curling up tracks.
Effect is probably more serious for TPC
than for CDC.
Linking to VTXD to eliminate primary tracks
originating from a displaced vertex in Z.
Repeat everything for multi-jet events.
21