1209.6268 (Guo-Ying Chen et al.)

Study of the anomalous cross section lineshape of e^+e^-\to D\bar D at
ψ(3770) with an effective field theory    [PDF]

Guo-Ying Chen, Qiang Zhao

We study the anomalous cross section lineshape of e^+e^-\rightarrow D\bar D with an effective field theory. Near threshold, most of the D\bar D pairs are from the decay of \psi(3770). Taking into account that the non-resonance background is dominated by the \psi(2S) transition, the produced D\bar D pair can undergo final state interactions before it is detected. We propose an effective field theory for the low energy D\bar D interactions to describe this final state interactions, and find that the anomalous lineshape of the D\bar D cross section observed by the BESII collaboration can be well described.

View original: http://arxiv.org/abs/1209.6268