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Triangle singularity in the decays
We study the reaction and
find that the mechanism to produce this decay develops a triangle singularity
around ~MeV. The differential width
shows a rapid growth around the
invariant mass being 1515~MeV as a consequence of the triangle singularity of
this mechanism, which is directly tied to the nature of the and
as dynamically generated resonances from the interaction of
pseudoscalar mesons. The branching ratios obtained for the decays are of the order of , accessible in
present facilities, and we argue that their observation should provide relevant
information concerning the nature of the low-lying scalar mesons.Comment: 12 pages, 8 figures, published in EPJ
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