Abstract
We discuss recent π
p
phase shift analyses and evaluations of dispersion relations. Besides the
D
13
resonance, which is much narrower than previously thought, they have revealed
P
11
,
S
11
and
S
31
objects’ in the 500 to 800 MeV region, all with strong inelastic decay modes. The
P
11
phase shift reaches 81°.
S
11
and
S
31
objects were predicted by
SU
(6), but the behaviour of
P
11
is difficult to reconcile either with pure
SU
(6) or with the reciprocal
NN
* bootstrap.
Cited by
10 articles.
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