Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass limits for scalar and gauge leptoquarks from $ K_L^0 \to e^{\mp}
  \mu^{\pm}, B^0 \to e^{\mp} \tau^{\pm} $ decays   The contributions of scalar and gauge leptoquarks into widths of $K^0_L \to
e^{\mp} \mu^{\pm}$, $B^0 \to e^{\mp} \tau^{\pm}$ decays are calculated in the
models with the vectorlike and chiral four color symmetry and with the Higgs
mechanism of the quark-lepton mass splitting. From the current data on $K^0_L$
and $B^0$ decays the mass limits for scalar and chiral leptoquarks and the
updated vector leptoquark mass limits are obtained. It is shown that unlike the
gauge leptoquarks the scalar leptoquark mass limits are weak, of order or below
their direct mass limits. The search for such scalar leptoquarks at LHC and the
further search for leptonic decays $ B^0 \to l^+_i l^-_j $ are of interest.

1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph