After some work, I have come to the conclusion that the wiser fits are the best to use, unless looking explicitly at resonant pion production.
Here are the main points:
Positive Pions | Negative Pions |
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Positive Pions | Negative Pions |
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How to get the neutral pion cross section from the chared pions?
Assume iso-spin symmetry to get neutron cross section. (p pi+ to n pi-, p pi- to n pi+)
Then cross section for neutral pions is
( sig(pi+) + sig(pi-) )/2
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