Publication: Strange resonance poles from K π scattering below 1.8 GeV
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2017-02-11
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Springer
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Abstract
In this work we present a determination of the mass, width, and coupling of the resonances that appear in kaon-pion scattering below 1.8 GeV. These are: the much debated scalar ĸ- meson, nowadays known as K(_1)(*) (800), the scalar K(_1)(*) (1430), the K*(892) and K(_1)(*) (1410) vectors, the spin-two K(_1)(*) (1430) as well as the spin-three K(_1)(*) (1780). The parameters will be determined from the pole associated to each resonance by means of an analytic continuation of the Kπ scattering amplitudes obtained in a recent and precise data analysis constrained with dispersion relations, which were not well satisfied in previous analyses. This analytic continuation will be performed by means of Pade approximants, thus avoiding a particular model for the pole parameterization. We also pay particular attention to the evaluation of uncertainties.
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JRP and AR are supported by the Spanish Project FPA2014-53375-C2-2 and the Spanish Excellence network HADRONet FIS2014-57026-REDT. The work of JRE was supported by the DFG (SFB/TR 16, “Subnuclear Structure of Matter”) and the
Swiss National Science Foundation.