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OD Calorimetry Study Update — Z vertex position dependence Jaewon Park University of Rochester MINERvA/Jupiter Group Meeting, May 17, 2006
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2 Contents Calibration factor dependency Beam energy Theta Phi Radial primary vertex position Longitudinal primary vertex position We want that calibration factor doesn’t change too much
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3 Detector geometry and primary vertex position No ECAL, it’s just part of Active target z=0 is set to center of whole detector volume automatically z=0 depends on number of each module. Active target is pretty much like cube Should I consider center of Active target as most probably primary vertex ? Probably center of upstream half of active target Active target OD-HCAL DS-HCAL DS-ECAL Nuclear target 149.46cm87.45cm135.09cm73.08cm 243.9cm 212.85cm
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4 Longitudinal primary vertex dependence There’s some variation of resolution Mean shift didn’t change much Cut efficiency decreases as ID distance reduces
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5 Comparison with radial offset Resolution variation has similar pattern Calibration factor and cut efficiency are very sensitive to radial primary vertex position
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6 Looking at QE data - primary vertex position In the QE configuration file, VERTEX 75. 0. 0. -119. 0 it means event will be generated randomly within a cylinder r=75cm, (x,y)=(0,0), -119<z<0 Z distributes evenly Larger radial distance has bigger contribution Most of event will be best-or-worst resolution and calibration when particle goes to OD-HCAL
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7 Looking at QE event data - theta distribution Neugen events Estimate how much proton will hit DS- HCAL 40-50% More accurate number can be obtained from direct simulation
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