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arXiv 0912.0585hep-phastro-ph.CO
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轻子味破坏与R宇称破坏的宇宙学约束

Lepton Flavor Violation and Cosmological Constraints on R-parity Violation

Motoi Endo, Koichi Hamaguchi, Sho Iwamoto

摘要:

在超对称标准模型中,R宇称破坏耦合受到严格的限制,否则它们会在电弱跃迁之前消除现有的重子不对称性。通常认为,如果重子数和轻子味数之一在这些R-宇称破坏耦合中足够守恒,那么这个宇宙学约束就可以被绕过,因为每种轻子味的B/3-L_i分别通过sphaleron过程守恒。讨论了轻子味破坏对B-L守恒的影响,指出即使很小的轻子混合角θ_{12} \gsim { \cal O}(10^{-4})和θ_{23},θ_{13} \gsim { \cal O}(10^{-5})也会破坏分离的B/3-L_i守恒.特别是,如果在MEG和B工厂等实验中观察到轻子味违反,这将意味着所有的R宇称违反耦合必须被抑制,以避免B-L擦除。我们还讨论了最轻的MSSM粒子在LHC衰变的影响。

英文摘要:

In supersymmetric standard models R-parity violating couplings are severely constrained, since otherwise they would erase the existing baryon asymmetry before the electroweak transition. It is often claimed that this cosmological constraint can be circumvented if the baryon number and one of the lepton flavor numbers are sufficiently conserved in these R-parity violating couplings, because B/3-L_i for each lepton flavor is separately conserved by the sphaleron process. We discuss the effect of lepton flavor violation on the B-L conservation, and show that even tiny slepton mixing angles θ_{12} \gsim {\cal O}(10^{-4}) and θ_{23}, θ_{13}\gsim {\cal O}(10^{-5}) will spoil the separate B/3-L_i conservation. In particular, if lepton flavor violations are observed in experiments such as MEG and B-factories, it will imply that all the R-parity violating couplings must be suppressed to avoid the B-L erasure. We also discuss the implication for the decay of the lightest MSSM particle at the LHC.

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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