Overview

• Hadron subtraction at high pT (EMCEGA)
• estimated the shape with hadron candidate

E/p distributions

• E/p distribution
  • -1<nSigma<3 (electron)
  • nSigma <- 3.5 (hadron)
• nSigma < -3.5 represent background shape

• E/p after subtracting nSigma < -3.5

• E/p mean and Sigma

Hadron contamination

• Hadron contamination level about 10 % with -1<nSigma<3 and 0.9 < E/p < 1.3

Raw electron spectrum after subtracting Background

/Users/shingo/WRK/Dayana/2012/05/10/Electrons_PbPb_20_20120508-0942_tpc

-- ShingoSakai - 22-May-2012