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HES Status Report Nov ’07 Part2

Contents. HES Status Report Nov ’07 Part2. Matrix tune ( reminder). Use MINUIT L peak only (no BG event) HKS matrix is not distorted HES angular matrix is also not distorted Change E Q1, EQ2 strength ~1% for distorted event. Matrix tune (reminder).

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HES Status Report Nov ’07 Part2

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  1. Contents HES Status ReportNov ’07 Part2

  2. Matrix tune (reminder) • Use MINUIT • L peak only (no BG event) • HKS matrix is not distorted • HES angular matrix is also not distorted • Change EQ1, EQ2 strength ~1% for distorted event

  3. Matrix tune (reminder) • 初期値=GOD matrixでmatrix tune。さすがにこれはGOD(に近いもの)収束。 GOD/before after

  4. MM by GOD Matrix • No target, EDC include • Position & Angular Resolution for HKS side is 150mm, 0.3mrad L : 2122 S : 1714 BG(total) : 57398 BG(1.115 - 1.1165) : 328 m=1.1157 [GeV] s=358 [keV] m=1.1927 [GeV] s=388 [keV] 1.19264 1.11568

  5. Matrix Tune その2 • 条件 • initial value : 0th = 0.967, 1st = dummy mat. (Q1 & Q2 1% up), other =0 • limit : 0th = [0.966, 0.968], 1st = [-0.1, 0.1], other = none • L only, No BG GOD before after

  6. Matrix Tune その2 -Result- ポイント:Lだけ、BGなし、Emomのみtune、 ”GOD” tune (GODの0次、1次をある程度知っている) m=1.1156 [GeV] s=350 [keV] m=1.1925 [GeV] s=358 [keV] 1.19264 1.11568

  7. Matrix Tune その3 • 条件 • initial value : 0th = 0.967, 1st = dummy mat. (Q1 & Q2 1% up), other =0 • limit : 0th = [0.966, 0.968], 1st = [-0.1, 0.1], other = none • L + BG GOD before after その2と全く変わらず

  8. 今週のまとめ • LのみでHESの運動量Matrixだけをtuneする場合は適切な0次、1次の初期条件、limitを課せば収束する。S/Nが10:1程度の場合も全く同様。 • linearityについても問題ない。 Next • HKS側の運動量Matrixもゆがめてみる。それが終わったら両アームの角度。今回と同様の条件で収束するのか? • L, Sを用いたtuningから12Cなどの解析に移る時に必要な角度分解能を見積もる。これによりSSのパターンを決める。 • BGの量を増やしてみる。どのような影響があるか。この結果でH20もしくはCH2 Runで要求されるビーム強度が決まる。 • Beam Energy Scanは必要なのか? • GODとdummyの役割を交換 • ただいまプログラムを整理中・・・近日公開?

  9. Next to do

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