Abstract
Abstract
It is demonstrated that for the isospin I = 1/2 πN scattering amplitude, T
I=1/2(s, t),
s
=
m
N
2
−
m
π
2
2
/
m
N
2
and
s
=
m
N
2
+
2
m
π
2
are two accumulation points of poles on the second sheet of complex s plane, and are hence accumulation of singularities of T
I=1/2(s, t). For T
I=3/2(s, t),
s
=
m
N
2
−
m
π
2
2
/
m
N
2
is the accumulation point of poles on the second sheet of the complex s plane. The proof is valid up to all orders of chiral expansions.
Funder
China National Natural Science Foundations
Subject
Physics and Astronomy (miscellaneous)
Cited by
3 articles.
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