Procedure to determine ZYAM

• symmetrize deltaPhi distribution around deltaPhi~0
• fit second degree polynomial (pol2) around a dip corresponding to deltaPhi~pi/2
• vary the fitting range
  • pions:
    • ZYAM(1): deltaPhi = (0.5;2.8)
    • ZYAM(2): deltaPhi = (0.5;2.5)
  • protons:
    • ZYAM(1): deltaPhi = (0.2;3.14)
    • ZYAM(2): deltaPhi = (0.7;3.14)

• Note on the ZYAM procedure
  • try fitting a triple Gaussian instead of pol2
  • look at large deltaEta to determine the ZYAM

ZYAM for distribution of associated pions and protons corrected by mixed events

• pT_{assoc} = (1.5;2.0):
  

• pT_{assoc} = (2.0; 2.5):
  

• pT_{assoc} = (2.5; 3.0):
  

• pT_{assoc} = (3.0; 3.5):
  

• pT_{assoc} = (3.5; 4.0):
  

Comparison of yield obtained by using ZYAM(1) and ZYAM(2)

RMS method

• comparison of zyam from fits in 2 fitting ranges, Pion:
  

• comparison of zyam from fits in 2 fitting ranges, Proton:
  

Histogram division

• Pion: systematic error: 5%
  

• Proton: systematic error: 10%
  

-- SonaPochybova - 25 Apr 2014