https://doi.org/10.1140/epjc/s10052-017-4942-2
Regular Article - Theoretical Physics
New physics contributions to 
decays
1
Department of Physics, Faculty of Arts and Sciences, Süleyman Demirel University, Isparta, 32260, Turkey
2
Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
* e-mail: gaberfaisel@sdu.edu.tr
Received:
2
February
2017
Accepted:
24
May
2017
Published online:
8
June
2017
The decay modes are dominated by electroweak penguins that are small in the standard model. In this work we investigate the contributions to these penguins from a model with an additional 
gauge symmetry and show there effects on the branching ratios of . In a scenario of the model, where 
couplings to the left-handed quarks vanish, we show that the maximum enhancement occurs in the branching ratio of 
where it can reach 6 times the SM prediction. On the other hand, in a scenario of the model where couplings to both left-handed and right-handed quarks do not vanish, we find that contributions can enhance the branching ratio of 
up to one order of magnitude comparing to the SM prediction for several sets of the parameter space where both 
and 
constraints are satisfied. This kind of enhancement occurs for a rather fine-tuned point where the constraint on 
is fulfilled by overcompensating the SM via 
.
© The Author(s), 2017
