https://doi.org/10.1140/epjc/s10052-013-2505-8
Regular Article - Theoretical Physics
Form factors of η c in light-front quark model
1
College of Mathematics & Physics, Chongqing University of Posts & Telecommunications, Chongqing, 400065, China
2
Department of Optometry, Shu-Zen College of Medicine and Management, Kaohsiung Hsien, 452, Taiwan
3
Physics Division, National Center for Theoretical Sciences, Hsinchu, 300, Taiwan
4
Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan
* e-mail: geng@phys.nthu.edu.tw
Received:
12
June
2013
Revised:
29
June
2013
Published online:
1
August
2013
We study the form factors of the η
c
meson in the light-front quark model. We explicitly show that the transition form factor of η
c
→γ
∗
γ as a function of the momentum transfer is consistent with the experimental data by the BaBar collaboration, while the decay constant of η
c
is found to be 
and 
for 
by using two η
c
→γγ decay widths of 5.3±0.5 and 7.2±2.1 keV, given by Particle Data Group and Lattice QCD calculation, respectively.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013
