Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the anomalous cross-section lineshape of e^+e^-\to D\bar D at
  \psi(3770) with an effective field theory   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 $\psi(3770)$. Taking into account the fact that the
nonresonance background is dominated by the $\psi(2S)$ 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.

3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs