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A tetraquark 81-plet with $JPC=1-+$ J PC = 1 - + or a hybrid nonet
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Authors: Niu Su, Er-Liang Cui, Yi-Wei Jiang, Hua-Xing Chen
Year
2026
Paper ID
75795
Status
Peer-reviewed
Abstract Read
~2 min
Abstract Words
249
Citations
N/A
Abstract
Abstract Confirming the existence of hybrid states remains challenging due to their experimental indistinguishability from tightly bound tetraquarks and loosely bound molecules. To address this issue, we employ QCD sum rules to systematically investigate the $pi 1(1600)π 1 ( 1600 ) andeta 1(1855)η 1 ( 1855 ) as candidate tetraquark states with exotic quantum numbersJPC = 1-+J PC = 1 - + . Within the hybrid framework, anSU(3)S U ( 3 ) flavor nonet is expected, featuring two isoscalar configurations,q{bar{q}}gq q ¯ g ands{bar{s}}gs s ¯ g , whereq = u/dq = u / d . Moreover, the decay width of thes{bar{s}}gs s ¯ g state into theK^* {bar{K}}^*K ∗ K ¯ ∗ channel (VV) is found to be two orders of magnitude smaller than that into theeta eta primeη η ′ channel (PP) [1]. In contrast, the tetraquark scenario predicts anSU(3)S U ( 3 ) flavor 81-plet comprising three isoscalar states:qq{bar{q}}{bar{q}}q q q ¯ q ¯ ,qs{bar{q}}{bar{s}}q s q ¯ s ¯ , andss{bar{s}}{bar{s}}s s s ¯ s ¯ . Our analysis yields a mass of2.22+0.18-0.26 textrm{GeV}2 . 22 - 0.26 + 0.18 GeV for thess{bar{s}}{bar{s}}s s s ¯ s ¯ tetraquark state, which is expected to decay predominantly into theφ φϕ ϕ channel (VV) and theeta f1(1420)η f 1 ( 1420 ) channel, while its decay into the theeta eta prime$ η η ′ channel (PP) is significantly suppressed. Therefore, experimental searches focusing on the VV decay channels are essential for discriminating between hybrid and tetraquark scenarios.
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- Abstract Confirming the existence of hybrid states remains challenging due to their experimental indistinguishability from tightly bound tetraquarks and loosely bound molecules.
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