$K_0^{\ast }(800)$ as a companion pole of $K_0^{\ast }(1430)$

Abstract

We study the light scalar sector up to $1.8$ GeV by using a quantum field theoretical approach which includes a single kaonic state in a Lagrangian with both derivative and non-derivative interactions. By performing a fit to $\pi K$ phase shift data in the $I=1/2,$ $J=0$ channel, we show that $K_0^{\ast }(800)$ (or $\kappa$) emerges as a dynamically generated companion pole of $K_0^{\ast }(1430)$. This is a result of investigating quantum fluctuations with one kaon and one pion circulating in the loops dressing $K_0^{\ast }(1430)$. We determine the position of the poles on the complex plane in the context of our approach: for $K_0^{\ast }(1430)$ we get $(1.413\pm 0.002)-i0.02cm(0.127\pm 0.003)$ (in GeV), while for $\kappa$ we get $(0.746\pm 0.019)-i0.02cm(0.262\pm 0.014)$ (in GeV). The model-dependence of these results and related uncertainties are discussed in the paper. A large-$N_c$ study confirms that $K_0^{\ast }(1430)$ is predominantly a quarkonium and that $K_0^{\ast }(800)$ is a molecular-like dynamically generated state.

7 pages, 5 figures, 2 tables

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