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arXiv · 2303.09175

Probing the structure of $\chi_{c1}(3872)$ with photon transition form factors

Izabela Babiarz·Roman Pasechnik·Wolfgang Schäfer·Antoni Szczurek
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Abstract

We propose to study the structure of the enigmatic $\chi_{c1}(3872)$ axial vector meson through its $\gamma^*_L \gamma \to \chi_{c1}(3872)$ transition form factor. We derive a light-front wave function representation of the form factor for the lowest $c \bar c$ 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 $c \bar c$ Fock-state in the photon-induced production. Our results for the $Q^2$ dependence can be tested by future single tagged $e^+ e^-$ experiments, giving further insights into the short-distance structure of this meson.

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Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer, Antoni Szczurek. 2023-03-16. Probing the structure of $\chi_{c1}(3872)$ with photon transition form factors. https://doi.org/10.1103/physrevd.107.l071503

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