Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X_1(2900) as a D_1 K molecule   The analyses of the LHCb data on X(2900) in the D^- K^+ spectrum are
performed. Both dynamically generated and explicitly introduced X_1(2900) are
considered. The results show that both these two approaches support the
interpretation of X_1(2900) as a bar{D}_1 K molecular state, with J^{P}=1^- and
an iso-singlet interpretation is much more favorable. The effect of triangle
singularity on the production of X_1(2900) is also discussed, and it is found
that it cannot be interpreted as a pure triangle cusp.

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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat