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arXiv 1104.0602hep-phhep-ex
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轻子Dirac CP相的Z_2对称性预测

Z_2 Symmetry Prediction for the Leptonic Dirac CP Phase

Shao-Feng Ge, Duane A. Dicus, Wayne W. Repko

摘要:

探讨了将广义隐水平Z_2对称性应用于中微子质量矩阵的与模型无关的结果。狄拉克CP相位delta_D可以用三个混合角表示为4 c_a s_a c_s s_s s_x cos delta_D =(s^2_s - c^2_s s^2_x)(c^2_a - s^2_a)其中s_i、c_i是大气角、太阳角和反应堆角的正弦和余弦。这个关系与中微子质量以及中微子是狄拉克型还是马约拉纳型无关。给定当前对角度的约束,delta_D被约束为几乎最大,这是可以在诸如NOvA和T2 K的实验中探索的结果。马约拉纳CP相位不受任何约束,因此是模型相关的。在不指定delta_D的情况下,也得到了具有下限的θ_x分布.

英文摘要:

Model-independent consequences of applying a generalized hidden horizontal Z_2 symmetry to the neutrino mass matrix are explored. The Dirac CP phase delta_D can be expressed in terms of the three mixing angles as 4 c_a s_a c_s s_s s_x cos delta_D = (s^2_s - c^2_s s^2_x) (c^2_a - s^2_a) where the s_i, c_i are sines and cosines of the atmospheric, solar, and reactor angles. This relation is independent of neutrino masses and whether neutrinos are Dirac- or Majorana-type. Given the present constraints on the angles, delta_D is constrained to be almost maximal, a result which can be explored in experiments such as NOvA and T2K. The Majorana CP phases do not receive any constraint and are thus model-dependent. Also a distribution of theta_x with a lower limit is obtained without specifying delta_D.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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