论文标题
从小型Instantons增强了EDM
Enhanced EDMs from Small Instantons
论文作者
论文摘要
我们表明，通过引入一个尺寸增强质量的轴向场，以$λ_ {\ rm si} $提高了对$ cp $违规的外部来源的敏感性，从而解决了强大的$ cp $问题的模型。在存在较高维$ cp $ -odd的情况下，以$λ_ {\ rm cp} $的规模来源，与增强轴质量的相同机制也可以改变轴轴的潜力，从而将潜在的最小值转移到因子$ \proptotopotopottopotoλ^2 _ {\ rm si} \ rm si}/λ^2 _ = \ cp cp cp cp rm cp。 $ CP $侵入增强的这种现象在新物理学的规模上构成了严格的限制，它在广泛的“小型Instanton”型号中得到了明确的证明，该模型具有$ CP $ -ODD，该模型由$ CP $ -ODD来源，源自尺寸 - 六个WEINBERG GLUONIC GLUONIC GLUONIC和FORFERMION和FORFERMION和FORFERMION OPTORES。我们发现，对于重轴质量，$ \ gtrsim 100 $ meV，由$λ_ {\ rm si}} \ Lessim 10^{10} $ GEV产生的新动态产生，$ cp $违反了Planck量表，可以通过未来的Electric Dipole Moment实验来探测。
We show that models in which the strong $CP$ problem is solved by introducing an axion field with a mass enhanced by non-QCD UV dynamics at a scale $Λ_{\rm SI}$ exhibit enhanced sensitivity to external sources of $CP$ violation. In the presence of higher-dimensional $CP$-odd sources at a scale $Λ_{\rm CP}$, the same mechanisms that enhance the axion mass also modify the axion potential, shifting the potential minimum by a factor $\proptoΛ^2_{\rm SI}/Λ^2_{\rm CP}$. This phenomenon of $CP$-violation enhancement, which puts stringent constraints on the scale of new physics, is explicitly demonstrated within a broad class of "small instanton" models with $CP$-odd sources arising from the dimension-six Weinberg gluonic and four-fermion operators. We find that for heavy axion masses $\gtrsim 100$MeV, arising from new dynamics at $Λ_{\rm SI}\lesssim 10^{10}$GeV, $CP$ violation generated up to the Planck scale can be probed by future electric dipole moment experiments.
