Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Feshbach resonances with large background scattering length: interplay
  with open-channel resonances   Feshbach resonances are commonly described by a single-resonance Feshbach
model, and open-channel resonances are not taken into account explicitly.
However, an open-channel resonance near threshold limits the range of validity
of this model. Such a situation exists when the background scattering length is
much larger than the range of the interatomic potential. The open-channel
resonance introduces strong threshold effects not included in the
single-resonance description. We derive an easy-to-use analytical model that
takes into account both the Feshbach resonance and the open-channel resonance.
We apply our model to $^{85}$Rb, which has a large background scattering
length, and show that the agreement with coupled-channels calculations is
excellent. The model can be readily applied to other atomic systems with a
large background scattering length, such as $^6$Li and $^{133}$Cs. Our approach
provides full insight into the underlying physics of the interplay between
open-channel (or potential) resonances and Feshbach resonances.

12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
16
The categories of this paper are: stat
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The categories of this paper are: adap-org
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-alg