https://doi.org/10.1140/epjc/s2006-02507-9
Theoretical Physics
Improving bounds on flavor changing vertices in the two Higgs doublet model from 
mixing
1
Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
2
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
* e-mail: radiazs@unal.edu.co
Received:
19
September
2005
Published online:
14
March
2006
We find some constraints on the flavor changing vertices of the two Higgs doublet model, from the 
measurement. Although bounds from this observable have already been considered, this paper takes into account the role of a new operator not included previously, as well as the vertices 
, 
and 
. Using the Cheng–Sher parametrization, we find that for a relatively light charged Higgs boson (200–300 GeV), we obtain 
, while the parameter 
could have values up to about 50. In addition, we use bounds for 
and obtained from 
at next to leading order, and study the case where the only vanishing vertex factors are the ones involving quarks from the first family. We obtain that 
is not sensitive to the change of the parameter 
, while 
.
© Springer-Verlag, 2006
