کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1849175 | 1528814 | 2015 | 6 صفحه PDF | دانلود رایگان |
In this Letter we analyse, in the context of the general 2-Higgs Doublet Model, the structure of the Yukawa matrices, Y˜1,2q, by assuming a four-zero texture ansatz for their definition. In this framework, we obtain compact expressions for Y˜1,2q, which are reduced to the Cheng and Sher ansatz with the difference that they are obtained naturally as a direct consequence of the invariants of the fermion mass matrices. Furthermore, in order to avoid large flavour violating effects coming from charged Higgs exchange, we consider the main flavour constraints on the off-diagonal terms of Yukawa texture (χ˜jq)kl (k≠lk≠l). We perform a χ2χ2-fit based on current experimental data on the quark masses and the Cabibbo–Kobayashi–Maskawa mixing matrix VCKMVCKM. Hence, we obtain the allowed ranges for the parameters Y˜1,2q at 1σ for several values of tanβtanβ. The results are in complete agreement with the bounds obtained taking into account constraints on Flavour Changing Neutral Currents reported in the literature.
Journal: Physics Letters B - Volume 742, 6 March 2015, Pages 347–352