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Indications of the possible observation of the lowest-lying 1^{-+} QCD state

Kwei-Chou Yang
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Abstract

We discuss properties of 1^{-+} exotic mesons within the framework of the QCD field-theoretic approach. We estimate the mass of the lowest-lying 1^{-+} exotic meson using renormalization-improved QCD sum rules, and find that the mass lies around $1.26\pm 0.15$ GeV, in good agreement with the $π_1(1400)$ data. This state should be expected in QCD. We find that the mass for the lowest-lying strange 1^{-+} meson is $1.31\pm 0.19$ GeV. Our result hints that the K^*(1410) may be the lowest-lying 1^{-+} nonet state.

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Kwei-Chou Yang. 2007-11-27. Indications of the possible observation of the lowest-lying 1^{-+} QCD state. https://doi.org/10.1103/physrevd.76.094001

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