Hadronic loop contributions to $J/\psi$ and ${\psi }^{\prime }$ radiative decays into $\gamma {\eta }_c$ or $\gamma {\eta }_c^{\prime }$

Abstract

Intermediate hadronic meson loop contributions to $J/\psi$, ${\psi }^{\prime }\to \gamma {\eta }_c$ ($\gamma {\eta }_c^{\prime }$) are studied apart from the dominant M1 transitions in an effective Lagrangian approach. Due to the property of the unique antisymmetric tensor coupling in $V\to VP$, the hadronic loop transitions provide explicit corrections to the M1 transition amplitudes derived from the naive "quenched" $c\bar{c}$ transitions via the coupling form factors. This mechanism interfering with the M1 transition amplitudes naturally accounts for the deviations from the Godfrey-Isgur model predictions in $J/\psi$ and ${\psi }^{\prime }\to \gamma {\eta }_c$. It also predicts a small branching ratio of ${\psi }^{\prime }\to \gamma {\eta }_c^{\prime }$, which can be examined by experimental measurements at BES and CLEO-c.

10 pages, 2 eps figures, revtex4; version to appear on Phys. Lett. B

References in corpus (4)

• Study on contributions of hadronic loops to decays of $J/\psi \to$ vector $+$ pseudoscalar mesons
• Possibility of measuring a0(980)-f0(980) mixing from J/psi -> phi a0
• On the near-threshold enhancement in $J/\psi \to \gamma X$ with $X\to \omega \varphi$
• A study of the Okubo-Zweig-Iizuka rule violations in ${\eta }_c\to VV$

Cited by in corpus (16)

• Heavy quarkonium: progress, puzzles, and opportunities
• Effect of charmed meson loops on charmonium transitions
• Charmonium spectrum and their electromagnetic transitions with higher multipole contributions
• Exotic and excited-state radiative transitions in charmonium from lattice QCD
• Novel analysis of the decays psi' -> h_c pi^0 and eta_c'-> chi_{c0} pi^0
• Further study of the helicity selection rule evading mechanism in ${\eta }_c$, ${\chi }_{c0}$ and $h_c$ decaying to baryon anti-baryon pairs
• Observation of $e^{+}{e}^{-}\to {\chi }_{c0}\omega$ and missing higher charmonium $\psi (4S)$
• Long-distant contribution and ${\chi }_{c1}$ radiative decays to light vector meson
• Light quark mass dependence in heavy quarkonium physics
• Exploring the ${\rm Y}(4S,5S,6S)\to h_b(1P)\eta$ hidden-bottom hadronic transitions
• Heavy quarkonium 2S states in light-front quark model
• Production of $X_b$ via ${\rm Y}(5S,6S)$ radiative decays
• Updated measurements of the M1 transition $\psi (3686)\to \gamma {\eta }_c(2S)$ with ${\eta }_c(2S)\to K\bar{K}\pi$
• Evasion of HSR in the charmless decays of excited $P$-wave charmonia
• Combined study of the isospin-violating decay $D_s^{\ast }\to D_s{\pi }^0$ and radiative decay $D_s^{\ast }\to D_s\gamma$ with intermediate meson loops
• Radiative Decays of Vector Mesons with Light-Cone Sum Rules