Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\Delta F = 2$ Effective Lagrangian in theories with vector like
  fermions   In this work we analyze a new piece present in the $\Delta F = 2$ effective
Lagrangian in models with extra vector-like quarks. This piece, which was not
taken into account previously, is required in order to preserve gauge
invariance once the unitarity of the CKM matrix is lost. We illustrate the
effects of this new piece in both, CP conserving and CP violating processes.

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex