Abstract
We study the scalar kaonic states K0* (800) and K0* (1430) by using a relativistic QFT Lagrangian in which only a single kaonic field corresponding to the well-established scalar state K0* (1430) is considered and in which both derivative and non-derivative interaction terms are taken into account. Even if the scalar spectral function shows a unique peak close to 1.4 GeV, we find two poles in the complex plane: 1.413 ± 0.002 — i(0.127 ± 0.003) GeV, which is related to the seed quark-antiquark state K0* (1430), and 0.746 ± 0.019 — i(262 ± 0.014) GeV, which is an additional companion pole related to K0* (800). As a further investigation for increasing Nc confirms, K0* (800) emerges as a dynamically generated four-quark object as a consequence of pion-kaon loops.
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