Introduction- Requirements for PHENIX EMCal -

• Requirement for cross section measurement
• 2% uncertainty corresponds to 10% cross section measurement error because of steep PT distribution

?pT = 2% ? ?? = 10%

• AGS beam test< 7GeV

• CERN beam test

10GeV-80GeV　NEW

• Energy Calibration to achieve 2% accuracy

2%

10%

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