Leptogenesis and residual CP symmetry

Leptogenesis and residual CP symmetry
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轻体发生和剩余 CP 对称性

DOI:
10.1007/jhep03(2016)206
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发表时间:
2016-02
影响因子:
5.4
通讯作者:
King, Stephen F.
King, Stephen F.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chen, Peng;Ding, Giu-Jun;King, Stephen F.

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本文在基于离散味和CP对称性的轻子味模型的框架下讨论了味依赖的轻子生成问题。在味的基础上工作,我们分析的情况下,两个一般的剩余CP对称性的中微子部门,这对应于所有可能的半直接模型的基础上保存Z2的中微子部门,连同CP对称性,这限制了PMNS矩阵到一个单一的自由参数,可以固定的反应堆角度。我们系统地研究和分类这种情况下,所有可能的剩余CP对称性,并表明,R-矩阵被严格约束到一个单一的自由参数,只有某些形式是符合成功leptogenesis,leptogenesis和PMNS参数之间可能的连接。形式主义是完全一般的意义上说,两个剩余CP对称性可能会导致从任何高能量离散味理论,尊重任何CP对称性。作为一个简单的例子,我们应用的形式主义,以高能量的S4味对称性与广义CP对称性,打破了两个剩余的CP对称性在中微子部门,恢复熟悉的结果PMNS预测,连同新的结果味依赖leptogenesis。
A bstractWe discuss flavour dependent leptogenesis in the framework of lepton flavour models based on discrete flavour and CP symmetries applied to the type-I seesaw model. Working in the flavour basis, we analyse the case of two general residual CP symmetries in the neutrino sector, which corresponds to all possible semi-direct models based on a preserved Z2 in the neutrino sector, together with a CP symmetry, which constrains the PMNS matrix up to a single free parameter which may be fixed by the reactor angle. We systematically study and classify this case for all possible residual CP symmetries, and show that the R-matrix is tightly constrained up to a single free parameter, with only certain forms being consistent with successful leptogenesis, leading to possible connections between leptogenesis and PMNS parameters. The formalism is completely general in the sense that the two residual CP symmetries could result from any high energy discrete flavour theory which respects any CP symmetry. As a simple example, we apply the formalism to a high energy S4 flavour symmetry with a generalized CP symmetry, broken to two residual CP symmetries in the neutrino sector, recovering familiar results for PMNS predictions, together with new results for flavour dependent leptogenesis.
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