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Summary of HES Status Report and SS Study Findings from June 2008

This report presents the findings from the HES study conducted in June 2008, focusing on momentum and energy loss in particle interactions. It analyzes events filtered by specific criteria, showcasing the relevance of different energy loss regions (Eloss) and hit requirements on the to the forward part (FP) and Q1 entrance. Key highlights include the effective parameters for the HES setup (radius of 2mm, interval of 2cm, thickness of 1”) and important findings regarding particle interactions, particularly between protons and pions with varying energy losses.

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Summary of HES Status Report and SS Study Findings from June 2008

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  1. Contents HES Status Report2Jun ’08

  2. SS Study @ HES part1 radius=2mm, interval=2cm, thickness=1” Widen momentum region (0.5-1.5GeV) Widen initial x’ region (-300mrad-300mrad) GeV/c CutはいずれもFPへのヒットのみを要求

  3. SS Study @ HES part2 縦軸、横軸ともに単位はGeV/c 黒：FPのみのCut 赤：Dの入り口をヒットしたイベント

  4. SS Study @ HES part3 改めてDを通過したイベントに限ってみたもの。 85/599イベントがEloss>100keV 360/599イベントが0keV<Eloss<100keV 154/599イベントがEloss=0keV

  5. 前回実験のHKS-SS radius diameter=0.249”, interval=0.6”(x), 0.8”(y), thickness=2”

  6. SS in Geant4 radius=0.249”, interval=0.6”(x), 0.8”(y), thickness=2” d = 85cm -> 170cm

  7. SS Study @ HES part1 縦軸、横軸ともに単位はGeV/c 黒：FPのみのCut 赤：Q1の入り口をヒットしたイベント 粒子は左：proton、右：pion 改めてQ1を通過したイベントに限ってみると (pion) 1035/12950イベントがEloss>100keV 4072/12950イベントが0keV<Eloss<100keV 7843/12950イベントがEloss=0keV

  8. SS Study @ HES part2 proton pion proton pion

  9. Summary • HES側は半径=2mm、間隔=2cm、厚さ=1”で問題なさそう。パターンを決める。 • HKS側の穴の大きさを間違えてましたとさ・・・S/Nが良かったのもそのため。 • 穴の大きさ=0.249φにして角度分解能=2.5mrad程度と思われる。間隔はdx=0.6”、dy=0.8”で分かれるはず。

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