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• W1520685680 abstract "We systematically construct tetraquark currents of ${I}^{mathrm{G}}{J}^{mathrm{PC}}={1}^{ensuremath{-}}{1}^{++}$ and classify them into types $mathbf{A}$ (antisymmetric), $mathbf{S}$ (symmetric) and $mathbf{M}$ (mixed), based on flavor symmetries of diquarks and antidiquarks composing the tetraquark currents. We use tetraquark currents of type $mathbf{M}$ to perform QCD sum rule analyses, and find a tetraquark current ${ensuremath{eta}}_{5ensuremath{mu}}^{M}$ with quark content $qsoverline{q}overline{s}$ ($q=u$ or $d$) leading to a mass of $1.44ifmmodepmelsetextpmfi{}0.08text{ }text{ }mathrm{GeV}$ consistent with the ${a}_{1}(1420)$ state recently observed by the COMPASS Collaboration. Our results support tetraquark explanations for both ${a}_{1}(1420)$ and ${f}_{1}(1420)$, assuming that they are isospin partners. We also study their possible decay patterns. As tetraquark candidates, the possible decay modes of ${a}_{1}(1420)$ are $S$-wave ${a}_{1}(1420)ensuremath{rightarrow}{K}^{*}(892)K$ and $P$-wave ${a}_{1}(1420)ensuremath{rightarrow}{f}_{0}(980)ensuremath{pi}$, while the possible decay patterns of ${f}_{1}(1420)$ are $S$-wave ${f}_{1}(1420)ensuremath{rightarrow}{K}^{*}(892)K$ and $P$-wave ${f}_{1}(1420)ensuremath{rightarrow}{a}_{0}(980)ensuremath{pi}$. We speculate that ${a}_{1}(1420)$ is partly responsible for the large isospin violation in the $ensuremath{eta}(1405)ensuremath{rightarrow}{f}_{0}(980){ensuremath{pi}}_{0}$ decay mode, which is reported by BESIII Collaboration in the $J/ensuremath{psi}ensuremath{rightarrow}ensuremath{gamma}3ensuremath{pi}$ process." @default.
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• W1520685680 date "2015-05-20" @default.
• W1520685680 modified "2023-10-14" @default.
• W1520685680 title "a1(1420)resonance as a tetraquark state and its isospin partner" @default.
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• W1520685680 doi "https://doi.org/10.1103/physrevd.91.094022" @default.
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