Systematic Uncertainties
dN/dh
- Background subtraction on tracklets < ±5%
- Uncertainty on a due to model differences < 5%
- Total contribution due to feed-down correction < 4% (typically 1%)
- Total fraction lost due to stopping particles < 5%
- Both are corrected via MC normalization
- Total uncertainty on dN/dh is ±8%
?Npart?
- Loss of trigger efficiency at low-multiplicity %
- Uncertainty on ?Npart ? ə%
- Uncertainty in modeling paddle fluctuations
- Uncertainty on ?Npart ? ɞ%
( dN/dh / ?Npart? )130 / ( dN/dh / ?Npart? )56
- Many uncertainties cancel in the ratio