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• W2896173868 abstract "A salient feature shared by all tetraquark candidates observed in experiment is the absence of flavor-exotic states of the type $bar a bbar c d$, with four different quark flavors. This phenomenon may be understood from the properties of large-$N_c$ QCD: On the one hand, consistency conditions for flavor-exotic Green functions, potentially containing these tetraquark poles, require the existence of two tetraquarks $T_A$ and $T_B$: each of them should decay dominantly via a single two-meson channel, $T_Ato M_{bar a b}M_{bar c d}$ and $T_Bto M_{bar a d}M_{bar c b}$, with suppressed rates $T_Ato M_{bar a d}M_{bar c b}$ and $T_Bto M_{bar a b}M_{bar c d}$. On the other hand, we have at hand only one diquark-antidiquark flavor structure $(bar a bar c)(b d)$ that might produce a compact tetraquark bound state. Taking into account that the diquark-antidiquark structure is the only viable candidate for a compact tetraquark state, one concludes that it is impossible to have two different narrow tetraquarks decaying dominantly into different two-meson channels. This contradiction suggests that large-$N_c$ QCD does not support the existence of narrow flavor-exotic tetraquarks. This argument does not rule out the possible existence of broad molecular-type flavor-exotic states, or of molecular-type bound states lying very close to the two-meson thresholds." @default.
• W2896173868 created "2018-10-26" @default.
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• W2896173868 date "2018-11-12" @default.
• W2896173868 modified "2023-10-15" @default.
• W2896173868 title "Are there narrow flavor-exotic tetraquarks in large- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> QCD?" @default.
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• W2896173868 doi "https://doi.org/10.1103/physrevd.98.094011" @default.
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