Abstract
We study the anomalous cross-section lineshape of e+e−→DD¯ with an effective field theory. Near the threshold, most of the DD¯ pairs are from the decay of ψ(3770). Taking into account the fact that the nonresonance background is dominated by the ψ(2S) transition, the produced DD¯ pair can undergo final-state interactions before the pair is detected. We propose an effective field theory for the low-energy DD¯ interactions to describe these final-state interactions and find that the anomalous lineshape of the DD¯ cross section observed by the BESII Collaboration can be well described.
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