Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing millicharged particles with NA64 experiment at CERN   In this note we estimate the sensitivity of the NA64 experiment to
millicharged particles ($\chi$). That experimental facility is dedicated to the
searching for dark sector particles in missing energy events at the CERN SPS.
We consider missing momentum signatures in the $\simeq$ 100 GeV electron and
muon beams and show that the later one allows to obtain more stringent bounds
on the millicharge $Q_{\chi}$, which for the $\chi$ masses $100$~MeV $\leq
m_{\chi} \leq 500$~MeV at the level $ Q_{\chi}/e\lesssim O(10^{-3}) -
O(10^{-2})$.

8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas