Probing the structure of χc1(3872) with photon transition form factors

Abstract

We propose studying the structure of the ${\ensuremath{\chi}}_{c1}(3872)$ axial vector meson through its ${\ensuremath{\gamma}}_{L}^{*}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}(3872)$ transition form factor. We derive a light-front wave function representation of the form factor for the lowest $c\overline{c}$ Fock state. We found that the reduced width of the state is well within the current experimental bound recently published by the Belle Collaboration. This strongly suggests a crucial role of the $c\overline{c}$ Fock-state in the photon-induced production. Our results for the ${Q}^{2}$ dependence can be tested by future single-tagged ${e}^{+}{e}^{\ensuremath{-}}$ experiments, giving further insight into the short-distance structure of this meson.