Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy neutral leptons in effective field theory and the high-luminosity
  LHC   Heavy neutral leptons (HNLs) with masses around the electroweak scale are
expected to be rather long-lived particles, as a result of the observed
smallness of the active neutrino masses. In this work, we study long-lived HNLs
in $N_R$SMEFT, a Standard Model (SM) extension with singlet fermions to which
we add non-renormalizable operators up to dimension-6. Operators which contain
two HNLs can lead to a sizable enhancement of the production cross sections,
compared to the minimal case where HNLs are produced only via their mixing with
the SM neutrinos. We calculate the expected sensitivities for the ATLAS
detector and the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER,
MATHUSLA, and MoEDAL-MAPP in this setup. The sensitive ranges of the HNL mass
and of the active-heavy mixing angle are much larger than those in the minimal
case. We study both, Dirac and Majorana, HNLs and discuss how the two cases
actually differ phenomenologically, for HNL masses above roughly 100 GeV.

6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph