Charmless Quasi-Two-Body Decays in Perturbative QCD Approach: Taking as Examples

Figure 2

Typical Feynman diagrams for the quasi-two-body decay in PQCD, where the black squares stand for the weak vertices, large (purple) spots on the quark lines denote possible attachments of hard gluons, the green ellipse represents kaon-pair, and the red one is the light bachelor meson [20].

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