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• W2959895789 abstract "In this paper, we consider a lopsided flavor texture compatible with thermal leptogenesis in partially composite Pati--Salam unification. The Davidson--Ibarra bound $M_{nu R1} gtrsim 10^9$ GeV for the successful thermal leptogenesis can be recast to the Froggatt--Nielsen (FN) charge of the lopsided texture. We found the FN charge $n_{nu1}$ of the lightest right-handed neutrino $nu_{R1}$ can not be larger than a upper bound, $n_{nu1} lesssim 4.5$. From the viewpoint of unification, the FN charges of the neutrinos $n_{nu i}$ should be the same to that of other SM fermions. Then, two cases $n_{nu i} = n_{qi} = (3,2,0)$ and $ n_{nu i} = n_{l i} = (n+1,n,n)$ are considered. Observations of PS model shows that the case of $n=0$, $n_{li} = n_{di} = (1,0,0)$ will be the simplest realization. To decrease the FN charges of these fermions from the GUT invariant FN charges $n_{qi} = (3,2,0)$, we utilize the partial compositeness. In this picture, the hierarchies of Yukawa matrices are a consequence of mixings between massless chiral fermions $f_{L}, f'_{R}$ and massive vector fermions $F_{L,R}, F'_{L,R}$. This is induced by the linear mixing terms $lambda^{f} bar f_{L} F_{R}$ and $lambda^{f'} bar F'_{L} f'_{R}$. As a result of the partial compositeness, the decreases of FN charges require fine-tunings between mass and Yukawa matrices either for the increases of $lambda^{f, f'}$ or for the decreases of $M_{F,F'}$. Therefore, the case for $n=2$ and $n_{di} = n_{li} = (3,2,2)$, which requires only increases of FN charges will be appropriate to build a natural model." @default.
• W2959895789 created "2019-07-23" @default.
• W2959895789 creator A5067833608 @default.
• W2959895789 date "2019-04-05" @default.
• W2959895789 modified "2023-09-23" @default.
• W2959895789 title "Lopsided texture compatible with thermal leptogenesis in partially composite Pati--Salam unification" @default.
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