Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Collisions between Two Ultracold Ground-State CaF
  Molecules   We measure inelastic collisions between ultracold CaF molecules by combining
two optical tweezers, each containing a single molecule. We observe collisions
between $^2\Sigma$ CaF molecules in the absolute ground state $|X,v=0,
N=0,F=0\rangle$, and in excited hyperfine and rotational states. In the
absolute ground state, we find a two-body loss rate of $7(4) \times 10^{-11}
\text{cm}^{3}/\text{s}$, which is below, but close to the predicted universal
loss rate.

28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat