t585 analysis status 3
DESCRIPTION
T585 analysis status 3. Contents On small light yield problem checked by Aron’s information Tracking status Transverse and Longitudinal momentum distribution Comparison of DATA with MC Photo electron distribution Next to do. 2006/2/2 HIDEYUKI SAKAMOTO. - PowerPoint PPT PresentationTRANSCRIPT
T585 analysis status 32006/2/2
HIDEYUKI SAKAMOTO
Contents• On small light yield problem checked by Aron’s information
• Tracking status
• Transverse and Longitudinal momentum distribution
• Comparison of DATA with MC
• Photo electron distribution
• Next to do
P.E as a function of waveguide
This shows that
The problem has also at station side .
From Aron’s check
Track reconstruction -- This is last talk• 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
2fiti
2
2fiti
i
2 )y(y)x(x
]/LRcos[zxx 0ifit 0
/(0.3B)p R T
/(0.3B)p L L
]/L[zRsin yy 0ifit 0 x0, y0
0
#4#3
#2
#1R
Checking of tool -- This is last talk• Input = hit position by GEANT
Vertical: residual (%)
Horizontal: fit parameters
Transverse momentum (pt)
Longitudinal momentum (pz)
MC v.s. reconstructed pt & pz-- This is last talk
MC
Reconst.
Why is Reconst. longitudinal momentum so broad?
•Bug?
•Effect of scattering?
NOW checking this.
Broadness of fitted Pz
• This problem occurs when turning angle, becomes small– z L -1 = z 0.3 B Pz -1 – Small Small B or Large Pz
• In MICE– B=4T,Pz=200MeV/c L=17cm => (z=1m)=337d
eg <= NO Problem
• In T585– B=1T,Pz=400MeV/c..etc.. 1/8 times as MICE=42deg– For analysis, using TOF for Pz reconstruction
#1
#2
#3#4
UpdatedSetup of fiber sheet for MC• Scifi.
– Diameter=350um=>(#)core:350umx94%=>(#)clad:350umx6%
– Pitch=420um– Distance=280um– Material=scinti.
=>(#)core:scinti.(Polythylene)=>(#)clad:PMMA
(#) from Kuraray catalogue• View
– Distance=0.63mm– Material=Air
=> polyurethane adhesive(PSILRA1000) (temporary)
• Mylar– Thickness=25um– Material=(Polyethylene terephthalate) [C10
H8]n
0.4
2m
m0.3
5m
m0.2
8
mm
0.63mm+25um
Sta
tion
Bod
yMylar
X W V
Filled withAdhesive
Difference for View material
There is no significant difference because input momentum is 3GeV/c pion, MIPS
L1A cut
L1A & residue
cut
Photo electron distribution –DATA—
Timing(L1A) Residual
cm
RUN#1255
STATION1
X-VIEW
!! NO CLUSTERING
DATA
Photo electron distribution – MC–
Distributed by POISSON and Gausian
Calibrated by eye (w/o fit)
MC
MCDATA
Station 1 X-VIEW (with Adhesive and Mylar)
!! NO CLUSTERING
Next to do
• Mapping– stopped for while..+My Request (as said e-mail to Aron)“Checking scifi alignment with my modified list”, making after checking by beam DATA.
• Tracking– Reconstruction using TOF for T585 analysis– Estimating errors of reconst. Momentums
• ADC distribution– Including “clustering”– Adjusting : Eye => Fitting