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arXiv 1109.4963hep-phastro-ph.COhep-ex
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极小超对称SU(4)$_c \times$ SU(2)$_L \times$ SU(2)$_R$中的轻子$CP$破坏和轻子生成

Leptonic $CP$ Violation and Leptogenesis in Minimal Supersymmetric SU(4)$_c \times$SU(2)$_L \times$SU(2)$_R$

Nobuchika Okada, Qaisar Shafi

摘要:

我们考虑了一个超对称SU(4)$_c \times$ SU(2)$_L \times$ SU(2)$_R$模型,它在中微子味混合矩阵中具有最小数目的Higgs多重态和Dirac和Majorana $CP$ -破坏相.该模型结合了带电费米子质量和夸克混合,并使用I型跷跷板来解释太阳和大气中微子振荡。利用中微子振荡的两个质量平方差和三个味混合角的数据,我们利用热leptogenesis和观察到的重子不对称性来寻找Dirac和Majorana相的允许区域。对于正常的中微子质量等级,我们发现所观察到的重子不对称性可以通过$δ_{CP}=3 π/2$附近的狄拉克相位来再现,这被最近的T2 K和NO $ν$ A数据强烈地表明。在中微子质量等级倒置的情况下,预测的重子不对称性与观测值不一致。

英文摘要:

We consider a supersymmetric SU(4)$_c \times$SU(2)$_L \times$SU(2)$_R$ model with a minimal number of Higgs multiplets and Dirac and Majorana $CP$-violating phases in the neutrino flavor mixing matrix. The model incorporates the charged fermion masses and quark mixings, and uses type I seesaw to explain the solar and atmospheric neutrino oscillations. With the neutrino oscillation data of two mass squared differences and three flavor mixing angles, we employ thermal leptogenesis and the observed baryon asymmetry to find the allowed regions for the Dirac and Majorana phases. For a normal neutrino mass hierarchy, we find that the observed baryon asymmetry can be reproduced by a Dirac phase of around $δ_{CP}=3 π/2$, which is strongly indicated by the recent T2K and NO$ν$A data. For the case of inverted neutrino mass hierarchy, the predicted baryon asymmetry is not compatible with the observed value.

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