Spectra fit details are given for the particles, you may view the details by clicking on the image for the appropriate centrality / particle.
| Centrality | π+ | π- | K+ | K- | p | p |
|---|---|---|---|---|---|---|
| 0 - 5% |
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| 5 - 10% |
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| 10 - 20% |
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| 20 - 30% |
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| 30 - 40% |
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| 40 - 50% |
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| 50 - 70% |
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The spectra fitting procedure takes three passes over the spectra for π± (2 for K±, p and p). We can subtract the e and K contamination for π±, we want to constrain the means (using aligned BichselI70m values), the sigmas, and some amplitudes (in regions of complete overlap).
- First Pass
- Fit electron amplitude using:
Ae = exp ( a + b xc ) 
- Second Pass
- Fix means using Calibrated Bichsel(I70m) values vs. centrality.
- sigmas using mean nfitpoints and fitpoint dependence
of means
- and electron amplitude from first pass to determine Kaon amplitude fit.
AK = xa exp ( b + c xd ) - Third Pass
- Fix all μ
- Fix all σ
- Fix e and K amplitudes (Only in regions of complete overlap)
- Extract pion yields