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We study the anomalous cross-section lineshape of $e^+e^-\rightarrow D\bar D$with an effective field theory. Near the threshold, most of the $D\bar D$ pairsare from the decay of $\psi(3770)$. Taking into account the fact that thenonresonance background is dominated by the $\psi(2S)$ transition, the produced$D\bar D$ pair can undergo final-state interactions before the pair isdetected. We propose an effective field theory for the low-energy $D\bar D$interactions to describe these final-state interactions and find that theanomalous lineshape of the $D\bar D$ cross section observed by the BESIIcollaboration can be well described.

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