uncertainty in x estimation (for prompt photon)

• momentum scale

  • momentum resolution, binning effect
  • systematic uncertainty - non-linearity of EMCal
    • PMT, FEE, shower leakage
  • 1% non-linearity - 6% cross section error at sqrt(s)=500GeV, pT=20GeV/c

• pT vs x

  • correlation
  • uncertainty due to kT

• binning effect

uncertainty ᡪ%

(* slope of asymmetry)

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