从SM中的已知机制估计违反EDM的CP
Estimation of CP violating EDMs from known mechanisms in the SM
摘要：
除了标准模型（SM）中已知的CP破坏源之外，还需要新的CP破坏源来解释宇宙的重子不对称性。测量基本粒子的非零永久电偶极矩（EDM），例如在电子或中子中，或者在原子核或原子中，可以帮助我们掌握CP破坏的来源，无论是在SM还是超越SM。SM中的多个机制可以生成违反CP的EDM，即\在弱扇区中通过CKM矩阵或在强扇区中通过QCD $\barθ$参数。我们将估计轻子，某些重子，选择原子和分子在（CKM $\bigoplus\barθ$）框架的最大可能的EDM，假设EDM完全起源于两个SM机制，独立。这些估计是根据目前实验上对EDM的上限提出的，在以下系统中-轻子：$e^-$，$μ^-$，$τ^-$，$ν_e^0$，$ν^0_μ$，$ν^0_τ$，重子：$n^0$，$p^+$，$Λ^0$，$Σ^0$，$Ξ^0$，$Λ^+_c$，$Ξ^+_c$，原子：$^{85}$ Rb，$^{133}$ Cs，$^{210}$ Fr，$^{205}$ Tl，$^{199}$ Hg，$^{129}$ Rb，$^{225}$ Ra，$^{223}$ Rn，和分子：HfF $^+$，PbO，YbF，ThO，RaF，TlF。特别是，开车回家的一点，在不同的系统中的EDM约束CP违反相互作用不同，我们表明，在两个不同的系统中的EDM相同的测量约束实际上可能不会同样约束CP违反参数，并强调需要测量非零EDM在多个系统中了解这些CP违反EDM的起源之前。
英文摘要：
New sources of CP violation, beyond the known sources in the standard model (SM), are required to explain the baryon asymmetry of the universe. Measurement of a non-zero permanent electric dipole moment (EDM) for fundamental particles, such as in an electron or a neutron, or in nuclei or atoms, can help us gain a handle on the sources of CP violation, both in SM and beyond. Multiple mechanisms within the SM can generate CP violating EDMs, viz.\ through the CKM matrix in the weak sector or through the QCD $\barθ$ parameter in the strong sector. We will estimate the maximum possible EDMs of leptons, certain baryons, select atoms and molecules in the (CKM$\bigoplus\barθ$) framework, assuming that the EDM wholly originates from either of the two SM mechanisms, independently. These estimates have been presented in light of the current experimental upper limits on the EDMs, in the following systems - leptons: $e^-$, $μ^-$, $τ^-$, $ν_e^0$, $ν^0_μ$, $ν^0_τ$, baryons: $n^0$, $p^+$, $Λ^0$, $Σ^0$, $Ξ^0$, $Λ^+_c$, $Ξ^+_c$, atoms: $^{85}$Rb, $^{133}$Cs, $^{210}$Fr, $^{205}$Tl, $^{199}$Hg, $^{129}$Xe, $^{225}$Ra, $^{223}$Rn, and molecules: HfF$^+$, PbO, YbF, ThO, RaF, TlF. Particularly, to drive home the point that EDMs in different systems constrain CP-violating interactions differently, we show that the same measured constraint on the EDM in two different systems may not actually be equally constraining on CP violating parameters, and to emphasize the need to measure a non-zero EDM in multiple systems before understanding the origins of these CP-violating EDMs.
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