On the possibility of Deeply Bound Hadronic Molecules from single Pion Exchange

Abstract

Pion exchange in S-wave between hadrons that are themselves in a relative S-wave can shift energies by hundreds of MeV. In the case of charmed mesons $D,D^{\ast },D_0,D_1$ a spectroscopy of quasi-molecular states may arise consistent with enigmatic charmonium states observed above 4 GeV in $e^{+}{e}^{-}$ annihilation. A possible explanation of $Y(4260)\to \psi \pi \pi$ and $Y(4360)\to {\psi }^{\prime }\pi \pi$ is found. Searches in $D\bar{D}3\pi$ channels as well as B decays are recommended to test this hypothesis.

5 pages, 1 figure. Version accepted to PRL. Equation 3 of v1 of this paper was wrong and has been taken into account in this version. Other minor typos corrected... conclusions unchanged

References in corpus (5)

• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• Is X(3872) a molecule?
• Observation of anomalous Upsilon(1S)pi+pi- and Upsilon(2S)pi+pi- production near the Upsilon(5S) resonance
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Cited by in corpus (8)

• Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
• Possible Molecular States of $D_s^{\ast }{\bar{D}}_s^{\ast }$ System and Y(4140)
• More kaonic bound states and a comprehensive interpretation of the D_{sJ} states
• Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process
• The molecular systems composed of the charmed mesons in the $H\bar{S}+h.c.$ doublet
• Molecular Interpretation of the Supercharmonium State Z(4475)
• Possible heavy molecular states composed of a pair of excited charm-strange mesons
• A study of meson-meson potential in the chiral quark model