Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Could Vector Leptoquarks be Rather Light?   A possible Standard Model extension of the Pati-Salam type with a lepton
number as the fourth color is reexamined. A new type of mixing in the
interaction of the $SU(4)_V$--leptoquark with quarks and leptons is shown to be
required. An additional arbitrariness of the mixing parameters could allow to
decrease noticeably the lower bound on the leptoquark mass $M_X$ originated
from the $\pi$ and $K$ decays and the $\mu e$ conversion. The only mixing
independent bound emerging from the cosmological limit on the $\pi^0
\rightarrow \nu \bar{\nu}$ decay width is $M_X > 18~TeV$.

36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio