Simulation status

22Feb06Takashi Matsushita

Purpose To study tracker performance with

different spacing

Now Geoff’s proposal==============1-2 | 45 472-3 | 35 203-4 | 20 184-5 | 10 15

Reproduce results at Berkeley

Simulation setup Input beam;

matched 2.5 pi mm rad. data10k events

G4MICE;version = Malcolm-demo-T20050208(newer than the one used for Berkeley)

Generated distributions x, y, px, py, pt, pz

(x) = 20.7 mm (y) = 20.9 mm (px) = 18.0 MeV/c (py) = 17.7 MeV/c (pt) = 11.6 MeV/c (pz) = 1.48 MeV/c

Reconstructed distribution x, y, px, py, pt, pz Events with reconstuction

failure are not included

rec. gen.===============(x) = 20.9 [20.7](y) = 21.2 [20.9](px)= 18.4 [18.0](py)= 18.3 [17.7](pt)= 12.6 [11.6](pz)= 28.9 [1.48]

Residuals distributions x, y, px, py, pt, pz Events with reconstuction

failure are not included

resolution ===============(x) = 3.66 [mm](y) = 4.02 [mm](px)= 4.27 [MeV/c](py)= 4.79 [MeV/c](pt)= 5.39 [MeV/c](pz)= 28.6 [MeV/c]

=> needs selection criteria to cut tails

Track quality # of points used for track

fit, chi^2/dof,reconstructed pz, estimated error on pz, dpz/pz in different range

dpz/pz for different #of points

dpz/pz dependence on # of points used for track reconstruction

dpz/pz gets better as # of points increase

require # of points = 5

pz related values vs true pt

correlation between; pz and pt(true), dpz and pt(true), dpz/pz and pt(true)in scatter and profile plots

require dpz/pz<0.25

distribution of rejected events

x y px

py pt pz

Reconstructed distribution x, y, px, py, pt, pz

with # of points = 3 and dpz/pz < 0.25 cuts

[no cuts]===============(x) = 21.5 [20.9](y) = 22.0 [21.2](px)= 19.8 [18.4](py)= 19.4 [18.3](pt)= 10.4 [12.6](pz)= 6.10 [28.9]

Residuals distributions x, y, px, py, pt, pz

with # of points = 3 and dpz/pz < 0.25 cuts

resolution [no cuts] ===============(x) = 0.56 [3.66](y) = 0.45 [4.02](px)= 2.23 [4.27](py)= 1.61 [4.79](pt)= 1.94 [5.39](pz)= 5.86 [28.6]

Comparison with Berkeley this analysis Berkeley

(x)= 0.56 0.54 (y) = 0.45 0.44 (px) = 2.2 2.1 (py) = 1.6 1.5 (pt) = 1.9 1.8 (pz) = 5.9 4.6

good agreement (X) dependence on dpz/pz cut in progress

Station spacing

Taming “Reconstruction” program of G4MICE to work with different station spacing…

Special thanks;Malcolm and Chris