A triangle-loop effective Lagrangian model predicts chi_c1(3872) radiative branching fractions tens of times above LHCb measurements, supporting a non-charmonium interpretation.
X(3872) revisited: the roles of OPEP and the quark degrees of freedom
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abstract
The $X(3872)$ is investigated by employing the quark-hadron hybrid model, that consists of the $c\bar c$ core, $D^{(*)}\bar D{}^*$, $J/\psi\omega$, and $J/\psi\rho$ two-meson states. Due to the attraction from the $c\bar c$-$D\bar D{}^*$ coupling and from the OPEP tensor coupling, a very thin peak can appear at the $D^{0}\bar D{}^{*0}$ threshold. The energy of the corresponding pole of the scattering matrix is $E=(+0.06-0.14i)$ MeV, which is on the physical sheet and above the threshold, the same as the one of the poles from the LHCb data analysis.
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Radiative decay of $\chi_{c1}$ states in effective Lagrangian approach
A triangle-loop effective Lagrangian model predicts chi_c1(3872) radiative branching fractions tens of times above LHCb measurements, supporting a non-charmonium interpretation.