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arXiv · 1209.6268

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

Guo-Ying Chen·Qiang Zhao
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Abstract

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 $D\bar D$ 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 $D\bar D$ pair can undergo final-state interactions before the pair is detected. We propose an effective field theory for the low-energy $D\bar D$ interactions to describe these 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.

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Guo-Ying Chen, Qiang Zhao. 2012-12-06. Study of the anomalous cross-section lineshape of e^+e^-\to D\bar D at ψ(3770) with an effective field theory. https://doi.org/10.1016/j.physletb.2012.12.015

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