Resonant CP violation due to heavy neutrinos at the LHC

Nuclear Physics B(2007)

引用 55|浏览45
摘要
The observed light neutrinos may be related to the existence of new heavy neutrinos in the spectrum of the SM. If a pair of heavy neutrinos has nearly degenerate masses, then CP violation from the interference between tree-level and self-energy graphs can be resonantly enhanced. We explore the possibility of observing CP asymmetries due to this mechanism at the LHC. We consider a pair of heavy neutrinos N1,2 with masses ranging from 100–500GeV and a mass-splitting ΔmN=mN2−mN1 comparable to their widths ΓN1,2. We find that for ΔmN∼ΓN1,2, the resulting CP asymmetries can be very large or even maximal and therefore, could potentially be observed at the LHC.
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cp violation,spectrum,grand unified theory
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