A resonancelike structure in the ${\pi }^{\pm }\psi (2S)$ mass spectrum arising in $B\to K{\pi }^{\pm }\psi (2S)$ has recently been reported. It is noted that the mass of this structure, $4433\pm 4\pm 2\mathrm{MeV}$, is not far from the threshold for production of $D^{*}{\overline{D}}_1(2420)$. A proposed mechanism for production of this state is suggested, and tests are suggested.

• Received 31 August 2007

DOI:https://doi.org/10.1103/PhysRevD.76.114002