Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lorentz invariant CPT violation: Particle and antiparticle mass
  splitting   The interpretation of neutrino oscillation data has led to the question
whether, in principle, an antiparticle like antineutrino can have a different
mass than its particle. In the framework of a Lorentz invariant CPT violation,
which is based on the nonlocal interaction vertex and characterized by the
infrared divergent form factor, we present an explicit Lagrangian model for the
fermion and antifermion mass splitting.

24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat