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Beam test -Dec 2005-. Tohoku university Nobuhiro Tani 20 September 2006. APV resolution & entry : χ2<∞. σAPV = 11.51 m m , 13.94 m m entry(χ2<∞) VA1:86365 event. APV resolution & entry χ2<3. σAPV = 11.93 , 13.79 entry(χ2<3) VA1:64496. APV resolution & entry χ2<1.

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beam test dec 2005

Beam test -Dec 2005-

Tohoku university

Nobuhiro Tani

20 September 2006

apv resolution entry 2
APV resolution & entry : χ2<∞
  • σAPV = 11.51mm , 13.94mm
  • entry(χ2<∞) VA1:86365 event
apv resolution entry 2 3
APV resolution & entry χ2<3
  • σAPV = 11.93 , 13.79
  • entry(χ2<3) VA1:64496
apv resolution entry 2 1
APV resolution & entry χ2<1
  • σAPV = 11.64 , 12.90
  • entry(χ2<1) VA1:31525
process
process
  • VA1 , APV clustering
  • event matching
  • tracking (determine a cluster set)
  • alignment DSSD-B(rotation , parallel shift) get σVA1
  • χ2 < 1,2,3,…cut
  • find APV hit & alginment
  • analysis-> get σAPV(誤差伝播とσresidualから)
finding cluster candidates
finding cluster candidates

max

max

  • cluster width ≦ 1,2,3,…

max

red:S/N>5 , blue:S/N>3

tracking
tracking

in all possible track (VA1)

find a minimum-χ2(XorY)track

→ define a proper pair of clusters … cluster set

χ2 X-Xt最小

→X=AxZ+Bx

χ2 Y-Yt最小

→Y=AyZ+By

alignment va1 system
alignment(VA1 system)

B

C

A

A(Xa,Ya)

Bt(Xt,Yt)

C(Xc,Yc)

B(Xb,Yb)

Track

a×Z+b

defined cluster set

alignment parameter:

rotation : -1.48mrad shift : (x,y) = (-188μ,-220μ)

get 2
get χ2
  • alignment

→ get χ2

→ χ2 cut

一番近いcluster(APV)をAPVのhitとする

→alignment

(hit を見つけてからalignmentは良くないかもしれない)

alignment parameter:

lower rot : -11.2mrad shift : y = -1251μ

upper rot: -1.80mrad shift : y = -59.0μ

analysis plan
analysis (plan)
  • efficiencyを求めるため

「APV hitのsearch 範囲( ?σAPV )」を用いる

(residual <?σのAPV entry) / (当たるtrack)

  • VA1 のwidthでefficiency,resolutionをscan
  • b.g. evaluation
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