T585 analysis status 2
2006/1/25
HIDEYUKI SAKAMOTO
Contents
• Mapping status
• Residual distribution
• Tracking status
• Transverse and Longitudinal momentum distribution
• Comparison of DATA with MC
• Photo electron distribution
• Next to do
Residual distribution
• Using mapping table of version12
Track reconstruction
• Based on Uniform B-Field and NO scattering
• Chi2 to be minimized
– Input: xi,yi, i=1,4
– Output: x0,y0,p0,R,L
– Degree of freedom: 8-5=3
 
2
i
(xi  xfit ) 2

2

(yi  yfit ) 2

xfit  x 0  Rcos[z i/L   0]
yfit  y0  Rsin [zi/L   0]
R  pT /(0.3B)
L  pL /(0.3B)
#3
#4
#2
2
#1
R
x0, y0
0
Checking of tool
• Input = hit position by GEANT
Vertical: residual (%)
Horizontal: fit parameters
Transverse
momentum
(pt)
Longitudinal
momentum
(pz)
MC v.s. reconstructed pt & pz
MC
Reconst.
Why is Reconst.
longitudinal momentum
so broad?
•Bug?
•Effect of scattering?
NOW checking this.
Setup of fiber sheet for MC
V
X
W
• Scifi.
Diameter=350um
Pitch=420um
Distance=280um
Material=scinti.
0.35mm 0.42mm 0.28
mm
–
–
–
–
• View
– Distance=0.63mm
– Material=Air (in this
talk)
0.63mm
Photo electron distribution –DATA—
Timing(L1A)
Residual
RUN#1255
STATION1
X-VIEW
cm
L1A cut
L1A & residue
cut
Photo electron distribution – MC-DATA
Calibrated by eye (w/o fit)
MC
Distributed by
Poisson
Deposit
energy
MC
DATA
Next to do
• Mapping
– Stop for a while
• Tracking
– Understanding broad width of reconst. Pz
– Estimating errors of reconst. momentums
• ADC distribution
– Material of view: Air => Adhesive
– Adjusting : Eye => Fitting