Form factors of ${\eta }_c$ in light front quark model

Abstract

We study the form factors of the ${\eta }_c$ meson in the light-front quark model. We explicitly show that the transition form factor of ${\eta }_c\to {\gamma }^{\ast }\gamma$ as a function of the momentum transfer is consistent with the experimental data by the BaBar collaboration, while the decay constant of ${\eta }_c$ is found to be $f_{{\eta }_c}=230.5_{-61.0}^{+52.2}$ and $303.6_{-116.4}^{+115.2}$ MeV for ${\eta }_c\sim c\bar{c}$ by using two ${\eta }_c\to \gamma \gamma$ decay widths of $5.3\pm 0.5$ and $7.2\pm 2.1$ keV, given by Particle Data Group and Lattice QCD calculation, respectively.

9 pages, 3 figures, accepted for publication in EPJC

References in corpus (11)

• Update: Precision D_s decay constant from full lattice QCD using very fine lattices
• Precise charm-quark mass from deep-inelastic scattering
• Two Photon Decays of Charmonia from Lattice QCD
• Covariant light-front approach for heavy quarkonium: decay constants, P \to γγand V \to P γ
• Measurement of the gamma gamma* --> eta_c transition form factor
• The ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }_c$ transition form factor
• Analysis of $K^{+}\to e^{+}{\nu }_e\gamma$ in light-front quark model and chiral perturbation theory of order $p^6$
• Study of the Radivative Pion Decay
• Study of pesudoscalar transition form factors within light front quark model
• Decay Spectrum of $K^{+}\to e^{+}{\nu }_e\gamma$
• Meson-Photon Transition Form Factors

Cited by in corpus (7)

• Lattice QCD and QCD Sum Rule determination of the decay constants of eta_c, J/psi and hc states
• Can NRQCD explain the $\gamma {\gamma }^{\ast }\to {\eta }_c$ transition form factor data?
• Charmed ${\Omega }_c$ weak decays into $\Omega$ in the light-front quark model
• The ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }_c(1S,2S)$ transition form factors for spacelike photons
• Systematic twist expansion of $({\eta }_c,{\eta }_b)\to {\gamma }^{\ast }\gamma$ transition form factors in light-front quark model
• Charmful two-body ${\Omega }_b$ decays in the light-front quark model
• Prospects for observing the ${\eta }_t$ $\to$ $W^{+}{W}^{-}$ decay at the HL-LHC