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arXiv · 2610.23240

$χ_{c1}(4010)$ as a $D^{*\pm}D^{\mp}$ Molecular State: Mass, Decay Constant, and Width

S. Damen·H. Sundu·J. Y. Süngü
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Abstract

The charmonium-like state $χ_{c1}(4010)$, recently observed by the LHCb Collaboration in $B^+ \to D^{*\pm}D^{\mp}K^+$ decays, is investigated as an axial-vector $D^{*\pm}D^{\mp}$ molecular state within the QCD sum rule approach. A two-point sum rule incorporating quark, gluon, and mixed vacuum condensates up to dimension $10$ yields the mass and decay constant, $m_{χ_{c1}(4010)} = (4005.89 \pm 47.15)~\text{MeV}$ and $f_{χ_{c1}(4010)} = (2.87 \pm 0.55)\times 10^{-3}~\text{GeV}^{4}$, in agreement with the LHCb measurement. Since this mass lies above the $D^{*\pm}D^{\mp}$ threshold, the strong coupling constants at the $χ_{c1}(4010)D^{*\pm}D^{\mp}$ vertices are extracted from three-point sum rules and used to compute the partial widths of the $D^{*-}D^{+}$ and $D^{*+}D^{-}$ channels. The resulting total width, $Γ_{χ_{c1}(4010)} = (57.64 \pm 9.64)~\text{MeV}$, is compatible with experiment within uncertainties. These results support a $D^{*\pm}D^{\mp}$ molecular interpretation of $χ_{c1}(4010)$ and offer sum-rule predictions for comparison with future measurements at BESIII, LHCb, and Belle~II.

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S. Damen, H. Sundu, J. Y. Süngü. 2026-10-16. $χ_{c1}(4010)$ as a $D^{*\pm}D^{\mp}$ Molecular State: Mass, Decay Constant, and Width. https://arxiv.org/abs/2610.23240

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