Two charmoniumlike charged axial resonances near 3885 MeV

Abstract

It is argued that the charged $Z_c^{+}(3885)$ resonance, treated as a `molecular' state of charmed $D$ and $D^{\ast }$ mesons, is likely to consist of two peaks unequally coupled to the $D^{\ast +}{\bar{D}}^0$ and $D^{+}{\bar{D}}^{\ast 0}$ channels. The peaks should be split in mass by at least approximately 1.5 MeV. This behavior arises from an enhancement of the effect of isospin violation in the masses of the $D$ and $D^{\ast }$ mesons due to apparent suppression of forces between the mesons depending on the spins of the heavy as well as of the light quarks. The suggested double-peak structure can be studied either by direct shape measurement in the channels with heavy mesons, or by isospin-violating transitions from $Z_c^{\pm }(3885)$ to the states of charmonium plus a light meson.

arXiv comment7 pages, 2 figures

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Cited by in corpus (2)

• Multiquark Resonances
• Quark spin structures of bottom-charmed threshold molecular states