Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An ultracold molecular beam for testing fundamental physics   We use two-dimensional transverse laser cooling to produce an ultracold beam
of YbF molecules. Through experiments and numerical simulations, we study how
the cooling is influenced by the polarization configuration, laser intensity,
laser detuning and applied magnetic field. The ultracold part of the beam
contains more than $2 \times 10^5$ molecules per shot and has a temperature
below 200 $\mu$K, and the cooling yields a 300-fold increase in the brightness
of the beam. The method can improve the precision of experiments that use
molecules to test fundamental physics. In particular, the beam is suitable for
measuring the electron electric dipole moment with a statistical precision
better than $10^{-30}$ e cm.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg