Two-photon width of eta_c and eta'_c from Heavy-Quark Spin Symmetry

Abstract

We evaluate the two-photon width of the pseudoscalar charmonia, Gamma(eta_c -> gamma gamma) and Gamma(eta'_c -> gamma gamma), within a Heavy-Quark Spin-Symmetry setting and show that whereas the former agrees with experiment, the latter is more than twice larger than the recent measurement by CLEO. When binding-energy effects are included in the eta'_c case, the discrepancy is worse, pointing out at a possible anomaly in the eta'_c decay.

arXiv comment4 pages, 2 figures, Revtex4; v2: discussions enlarged and some references added. The conclusions are unchanged

References in corpus (19)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Heavy Quark Symmetry
• Phenomenology of Heavy Meson Chiral Lagrangians
• Radiative Transitions in Charmonium from Lattice QCD
• Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays
• Two-Photon Decays of Mesons in a Relativistic Quark Model
• Observation of eta_c^{prime} Production in gamma gamma Fusion at CLEO
• Measurements of the mass and width of the eta_c meson and of an eta_c(2S) candidate
• Two-photon decay rates of heavy quarkonia in the relativistic quark model
• Annihilation Rate of Heavy $0^{-+}$ Quarkonium in Relativistic Salpeter Method
• New contributions to heavy-quarkonium production
• Spontaneous breaking of the lepton number and invisible majoron in a 3-3-1 model
• Pseuduscalar Heavy Quarkonium Decays With Both Relativistic and QCD Radiative Corrections
• B ->η_c K(η_c^\prime K) decays in QCD factorization
• The Decay ${\eta }_c\to \gamma \gamma$ : A Test for Potential Models
• Finite size vertex corrections to the three-gluon decay widths of $J/\psi$ and ${\rm Y}$ and a redetermination of ${\alpha }_s(\mu )$ at $\mu =m_c$ and $m_b$
• $B\to {\chi }_{c0,2}K$ decays: a model estimation
• Quarkonium Production at High-Energy Hadron Colliders

Cited by in corpus (23)

• Lattice QCD and QCD Sum Rule determination of the decay constants of eta_c, J/psi and hc states
• $Q\bar{Q}$ ($Q\in \{b,c\}$) spectroscopy using Cornell potential
• The form factors for the photon to pseudoscalar meson transitions - an update
• Properties of $Q\bar{Q}$ $(Q\epsilon b,c)$ mesons in Coulomb plus Power potential
• $O({\alpha }_s{v}^2)$ Corrections to Hadronic and Electromagnetic Decays of ${}^1{S}_0$ Heavy Quarkonium
• Weak productions of new charmonium in semi-leptonic decays of B_c
• Mass spectra and decay properties of $D_s$ Meson in a relativistic Dirac formalism
• Effective Lagrangian for Two-photon and Two-gluon Decays of $P$-wave Heavy Quarkonium ${\chi }_{c0,2}$ and ${\chi }_{b0,2}$ states
• Mass spectra and decay properties of $D$ Meson in a relativistic Dirac formalism
• Two Photon Transition Form Factor of $\bar{c}c$ Quarkonia
• Study of B-meson decays to eta_c K^(*), eta_c(2S) K^(*) and eta_c gamma K^(*)
• Decay rates of charmonia within a quark-antiquark confining potentials
• Study of charmonia in four-meson final states produced in two-photon collisions
• $O({\alpha }_s{v}^2)$ correction to pseudoscalar quarkonium decay to two photons
• Di-electron and two-photon widths in charmonium
• Prompt hadroproduction of ${\eta }_c(1S,2S)$ in the $k_T$-factorization approach
• Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin Symmetry
• η_b and η_c radiative decays in the Salpeter model with the AdS/QCD inspired potential
• The role of meson exchanges in light-by-light scattering
• Study of $B_c^{\ast }$ $\to$ $\psi (1S,2S)P$, ${\eta }_c(1S,2S)P$ weak decays
• Radiative and leptonic decays of the pseudoscalar charmonium state ${\eta }_c$
• Measurement of eta_c(1S), eta_c(2S) and non-resonant eta' pi+ pi- production via two-photon collisions
• Two-photon decay of pseudoscalar quarkonia