Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing the Universality of Free Fall at ${10^{ - 10}}$ level by
  Comparing the Atoms in Different Hyperfine States with Bragg Diffraction   We have performed a precision atomic interferometry experiment on testing the
universality of free fall (UFF) considering atoms' spin degree of freedom. Our
experiment employs the Bragg atom interferometer with $^{87}$Rb atoms either in
hyperfine state $\left| {F = 1,{m_F} = 0} \right\rangle $ or $\left| {F =
2,{m_F} = 0} \right\rangle $, and the wave packets in these two states are
diffracted in one pair of Bragg beams alternatively, which can help suppress
the common-mode systematic errors. We have obtained an
E$\rm{\ddot{o}}$tv$\rm{\ddot{o}}$s ratio $\eta = \left( { 0.9 \pm 2.7} \right)
\times {10^{ - 10}}$, and set a new record on the precision with a nearly 5
times improvement. Our experiment gives stronger restrictions on the possible
UFF breaking mechanism.

10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
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The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an