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arXiv 0907.4186hep-ph
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在CERN LHC上I型跷跷板的可测试性:揭示B-L对称性的存在

Testability of Type I Seesaw at the CERN LHC: Revealing the Existence of the B-L Symmetry

Pavel Fileviez Perez, Tao Han, Tong Li

摘要:

我们研究了在CERN大型强子对撞机上检验中微子质量的I型跷跷板机制的可能性。三代右手中微子(N_i)的加入为测量标准模型中的B-L偶然对称性(以及扩展对称性X=Y-5(B-L)/4)提供了一个有吸引力的选择。本文研究了标准模型的U(1)_{B-L}和U(1)_X扩展中通过Z'规范玻色子产生右手中微子的机制。本文讨论了在Delta L=2通道中N_i衰变产生的带电轻子的味组合。我们发现,干净的通道与双轻子加喷流和可能的第二顶点的N衰变可以提供决定性的信号在LHC连接的层次模式的轻中微子质量和混合特性的I型跷跷板机制。

英文摘要:

We study the possibility to test the Type I seesaw mechanism for neutrino masses at the CERN Large Hadron Collider. The inclusion of three generations of right-handed neutrinos (N_i) provides an attractive option of gauging the B-L accidental symmetry in the Standard Model (as well as an extended symmetry X=Y-5(B-L)/4). The production mechanisms for the right-handed neutrinos through the Z' gauge boson in the U(1)_{B-L} and U(1)_X extensions of the Standard Model are studied. We discuss the flavor combinations of the charged leptons from the decays of N_i in the Delta L=2 channels. We find that the clean channels with dilepton plus jets and possible secondary vertices of the N decay could provide conclusive signals at the LHC in connection with the hierarchical pattern of the light neutrino masses and mixing properties within the Type I seesaw mechanism.

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