Many body channels
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At high energy, at least few tenths of channels opens, and a large part of which is not measurable. So, they are described appling statistical relations in the isospin space from knowed channels, kept as reference channels. Using this method, channels with up to 8 pions in the final state are taken in account.

Channel numbering for many body final states

15 gamma p -> pi+ pi- p
16 gamma p -> pi0 pi+ n
17 gamma n -> pi+ pi- n
18 gamma n -> pi0 pi- p
23 gamma p -> pi+ pi- pi0 p

24 gamma p -> 3pi0 p. pi+ 2pi0 n. 2pi+ pi- n
25 gamma n -> pi+ pi- pi0 n
26 gamma n -> 3pi0 n. pi- 2pi0 p. pi+ 2pi- p
27 gamma p -> (4-8)pi N
28 gamma n -> (4-8)pi N