https://doi.org/10.1140/epjc/s10052-019-7211-8
Regular Article - Theoretical Physics
Flavor changing neutral current decays
(
) and
(
) via scalar leptoquarks
1
Departamento de Ciencias e Ingenierías, Universidad Iberoamericana, Boulevard del Niño Poblano 2901, Reserva Territorial Atlixcáyotl, San Andrés Cholula, CP 72820, Puebla, Mexico
2
Department of Science, Tecnologico de Monterrey, Campus Puebla, Av. Atlixcáyotl 2301, CP 72453, Puebla, Mexico
3
Facultad de Ciencias Físico-Matemáticas, Benemérita Universidad Autónoma de Puebla, CP 72570, Puebla, Mexico
* e-mail: gtv@fcfm.buap.mx
Received:
19
April
2019
Accepted:
8
August
2019
Published online:
21
August
2019
The flavor changing neutral current decays (
) and
(
) are studied in a renormalizable scalar leptoquark (LQ) model with no proton decay, where a scalar SU(2) doublet with hypercharge
is added to the standard model, yielding a non-chiral LQ
. Analytical results for the one-loop (tree-level) contributions of a scalar LQ to the
(
) decays, with
, are presented. We consider the scenario where
couples to the fermions of the second and third families, with its right- and left-handed couplings obeying
, where
parametrizes the relative size between these couplings. The allowed parameter space is then found via the current constraints on the muon
, the
decay, the LHC Higgs boson data, and the direct LQ searches at the LHC. For
TeV and
, we find that the
branching ratios are of similar size and can be as large as
in a tiny area of the parameter space, whereas
[
] can be up to
(
).
© The Author(s), 2019