| Summary: | We perform a theoretical study of the χcJ→ϕK⁎K¯→ϕKπK¯ reaction taking into account the K⁎K¯ final state interaction, which in the chiral unitary approach is responsible, together with its coupled channels, for the formation of the low lying axial vector mesons, in this case the h1(1380) given the selection of quantum numbers. Based on this picture we can easily explain why in the χc0 decay the h1(1380) resonance is not produced, and, in the case of χc1 and χc2 decay, why a dip in the K+π0K− mass distribution appears in the 1550-1600 MeV region, that in our picture comes from a destructive interference between the tree level mechanism and the rescattering that generates the h1(1380) state. Such a dip is not reproduced in pictures where the nominal h1(1380) signal is added incoherently to a background, which provides support to the picture where the resonance appears from rescattering of vector-pseudoscalar components.
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