On the origin of the $Y(4260)$

Abstract

We study the relation between the $\psi (4160)$ and the $Y(4260)$ within an unitarized effective Lagrangian approach. The $Y(4260)$ arises as a manifestation of the $\psi (4160)$, when a loop-driven decay of the type $\psi (4160)\to D_s^{\ast }{\bar{D}}_s^{\ast }\to J/\psi f_0(980)$ is enhanced by the proximity of the pole, corresponding to the $\psi (4160)$, to the \emph{almost} closed $D_s^{\ast }{\bar{D}}_s^{\ast }$ decay channel. Other $f_0$ resonances that may add a non-negligible contribution, by the same mechanism, are not included for simplicity, but they are not expected to change the main conclusion. Within this picture, the $Y(4260)$ is not, therefore, an independent resonance, but rather a variation of the $\psi (4160)$, which also explains why it is not seen in OZI-allowed decay channels in the experiment.

25 pages, 9 figures

References in corpus (22)

• Hadronic molecules
• Multiquark Resonances
• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• Evidence of Two Resonant Structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{h}_c$
• Measurement of the near-threshold $e^{+}{e}^{-}\to D\bar{D}$ cross section using initial-state radiation
• Determination of the pole position of the lightest hybrid meson candidate
• Evidence of a resonant structure in the $e^{+}{e}^{-}\to {\pi }^{+}{D}^0{D}^{\ast -}$ cross section between 4.05 and 4.60 GeV
• Vector and axial-vector couplings of D and D* mesons in 2+1 flavor Lattice QCD
• A New Look at the $Y$ Tetraquarks and ${\Omega }_c$ Baryons in the Diquark Model
• Cross section measurements of $e^{+}{e}^{-}\to \omega {\chi }_{c0}$ from $\sqrt{s}=$4.178 to 4.278 GeV
• Nonresonant explanation for the Y(4260) structure observed in the $e^{+}{e}^{-}\to J/\psi {\pi }^{+}{\pi }^{-}$ process
• Possible psi(5S), psi(4D), psi(6S) and psi(5D) signals in Lambda(c)-antiLambda(c)
• Interference effects in the X(4260) signal
• $X(4260)$ Revisited: A Coupled Channel Perspective
• Observation of $e^{+}{e}^{-}\to K\bar{K}J/\psi$ at center-of-mass energies from 4.189 to 4.600 GeV
• Cross section line shape of $e^{+}{e}^{-}\to {\chi }_{c0}\omega$ around the $Y(4260)$ mass region
• Line-shape and poles of the $\psi (3770)$
• $X(3872)$ as virtual companion pole of the charm-anticharm state ${\chi }_{c1}(2P)$
• The X(4260) and possible confirmation of psi(3D), psi(5S), psi(4D), psi(6S) and psi(5D) in J/psi pi+ pi-
• Line shape and $D^{(\ast )}{\bar{D}}^{(\ast )}$ probabilities of $\psi (3770)$ from the $e^{+}{e}^{-}\to D\bar{D}$ reaction
• Radially excited $\psi$ mesons and the $Y$ enhancements
• The pi-pi mass spectrum in Y(4260) -> pi-pi-J/psi

Cited by in corpus (5)

• Pentaquark and Tetraquark states
• A simple alternative to the Breit-Wigner distribution
• Modern meson spectroscopy: the fundamental role of unitarity
• On leptonic width of $X(4260)$
• Partial Wave Analysis of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Cross Section Measurement of $e^{+}{e}^{-}\to {\pi }^{\pm }{Z}_c(3900{)}^{\mp }$ from 4.1271 to 4.3583 GeV