Updated study of the ${\eta }_c$ and ${\eta }_c^{\prime }$ decays into light vector mesons

Abstract

We re-investigate the exclusive decays of ${\eta }_c$ and ${\eta }_c^{\prime }$ to a pair of light vector mesons, i.e. ${\eta }_c({\eta }_c^{\prime })\to VV$. The long-distance intermediate meson loop (IML) effects are evaluated as a non-perturbative mechanism in addition to the short-distance $c\bar{c}$ annihilation contributions. We show that both processes can be reasonably well constrained with the help of the available experimental data. Since ${\eta }_c$ and ${\eta }_c^{\prime }$ are the spin-0 partners of $J/\psi$ and ${\psi }^{\prime }$, respectively, our study is useful for gaining insights into the pQCD helicity selection rule violations in charmonium decays and the long-standing "$\rho \pi$ puzzle".

11 pages, 4 eps figures; Improved formulation based on 1010.1343[hep-ph]; Revised version accepted by Phys. Lett. B

References in corpus (10)

• Towards a dynamical understanding of the non-$D\bar{D}$ decay of $\psi (3770)$
• Decays of $J/\psi$ and ${\psi }^{\prime }$ into vector and pseudoscalar meson and the pseudoscalar glueball-$q\bar{q}$ mixing
• The evasion of helicity selection rule in ${\chi }_{c1}\to VV$ and ${\chi }_{c2}\to VP$ via intermediate charmed meson loops
• Further study of the helicity selection rule evading mechanism in ${\eta }_c$, ${\chi }_{c0}$ and $h_c$ decaying to baryon anti-baryon pairs
• Study of electromagnetic decay of $J/\psi$ and ${\psi }^{\prime }$ to vector and pseudoscalar
• ${\eta }_c$ mixing effects on charmonium and $B$ meson decays
• Pseudoscalar Quarkonium Exclusive Decays to Vector Meson Pair
• χ_{c0,2} decay into light meson pairs and its implication of the scalar meson structures
• A study of the Okubo-Zweig-Iizuka rule violations in ${\eta }_c\to VV$
• Search for ${\eta }_c^{\prime }$ decays into vector meson pairs

Cited by in corpus (9)

• Confirming the molecular nature of the $Z_b(10610)$ and the $Z_b(10650)$
• Investigating possible decay modes of $Y(4260)$ under the $D_1(2420)\bar{D}+c.c$ molecular state ansatz
• Hidden-charmonium decays of $Z_c(3900)$ and $Z_c(4025)$ in intermediate meson loops model
• Further understanding of the non-$D\bar{D}$ decays of $\psi (3770)$
• New puzzle in charmonium decays
• The strong vertices of charmed mesons $D$, $D^{\ast }$ and charmonia $J/\psi$, ${\eta }_c$
• A QCD sum rules calculation of the ${\eta }_c{D}^{\ast }D$ and ${\eta }_c{D}_s^{\ast }{D}_s$ form factors and strong coupling constants
• Improved measurements of branching fractions for ${\eta }_c\to \varphi \varphi$ and $\omega \varphi$
• Evasion of HSR in the charmless decays of excited $P$-wave charmonia