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• W3132121489 abstract "Early speculations about the existence of heavy hadron molecules were grounded on the idea that light-meson exchange forces could lead to binding. In analogy to the deuteron, the light mesons usually considered include the pion, sigma, rho and omega, but not the axial meson ${a}_{1}(1260)$. Though it has been argued in the past that the coupling of the axial meson to the nucleons is indeed strong, its mass is considerably heavier than that of the vector mesons and thus its exchange ends up being suppressed. Yet, this is not necessarily the case in heavy hadrons molecules; we find that even though the contribution to binding from the axial meson is modest, it cannot be neglected in the isovector sector where vector meson exchange cancels out. This might provide a natural binding mechanism for molecular candidates such as the ${Z}_{c}(3900)$, ${Z}_{c}(4020)$, or the more recently observed ${Z}_{cs}(3985)$. However, the ${Z}_{cs}(3985)$ is more dependent on a mixture of different factors, which (besides axial meson exchange) include $ensuremath{eta}$ exchange and the nature of scalar meson exchange. Together they point towards the existence of two ${Z}_{cs}(3985)$-like resonances instead of one, while the observations about the role of scalar meson exchange in the ${Z}_{cs}(3985)$ might be relevant for the ${P}_{cs}(4459)$. Finally, the combination of axial meson exchange and flavor-symmetry breaking effects indicates that the isovector ${J}^{PC}={0}^{++}$ ${D}^{*}{overline{D}}^{*}$ and the strange ${J}^{P}={2}^{+}$ ${D}^{*}{overline{D}}_{s}^{*}$ molecules are the most attractive configurations and thus the most likely molecular partners of the ${Z}_{c}(3900)$, ${Z}_{c}(4020)$, and ${Z}_{cs}(3985)$." @default.
• W3132121489 created "2021-03-01" @default.
• W3132121489 creator A5020953583 @default.
• W3132121489 creator A5027030261 @default.
• W3132121489 creator A5053360276 @default.
• W3132121489 creator A5079830584 @default.
• W3132121489 date "2021-12-20" @default.
• W3132121489 modified "2023-10-13" @default.
• W3132121489 title "Axial meson exchange and the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub><mml:mo stretchy=false>(</mml:mo><mml:mn>3900</mml:mn><mml:mo stretchy=false>)</mml:mo></mml:mrow></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mi>…" @default.
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