Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Test of the Pauli Exclusion Principle in the VIP-2 underground
  experiment   The validity of the Pauli Exclusion Principle, a building block of Quantum
Mechanics, is tested for electrons. The VIP (VIolation of Pauli exclusion
principle) and its follow-up VIP-2 experiments at the Laboratori Nazionali del
Gran Sasso search for x-rays from copper atomic transition that are prohibited
by the Pauli Exclusion Principle. The candidate events, if they exist,
originate from the transition of a $2p$ orbit electron to the ground state
which is already occupied by two electrons. The present limit on the
probability for Pauli Exclusion Principle violation for electrons set by the
VIP experiment is 4.7 $\times$ 10 $^{-29}$. We report a first result from the
VIP-2 experiment improving on the VIP limit, that solidifies the final goal to
achieve a two order of magnitude gain in the long run.

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
16
The categories of this paper are: stat
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci