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Beam test -Dec 2005-

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-

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  1. Beam test -Dec 2005- Tohoku university Nobuhiro Tani 20 September 2006

  2. APV resolution & entry : χ2<∞ • σAPV = 11.51mm , 13.94mm • entry(χ2<∞) VA1:86365 event

  3. APV resolution & entry χ2<3 • σAPV = 11.93 , 13.79 • entry(χ2<3) VA1:64496

  4. APV resolution & entry χ2<1 • σAPV = 11.64 , 12.90 • entry(χ2<1) VA1:31525

  5. 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)

  6. finding cluster candidates max max • cluster width ≦ 1,2,3,… max red:S/N>5 , blue:S/N>3

  7. 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

  8. 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)

  9. 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

  10. χ2 distribution

  11. 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

  12. b.g. evaluation

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