Chargino contributions in light of recent ${\epsilon }^{\prime }/\epsilon$

Abstract

Recently, the standard model prediction of ${\epsilon }^{\prime }/\epsilon$ was improved, and a discrepancy from the experimental results was reported at the $2.9\sigma$ level. We study the chargino contributions to $Z$ penguin especially with the vacuum stability constraint. The vacuum decay rate is investigated, and it is shown that the discrepancy can be explained if superparticles are lighter than 4-6 TeV. Correlations with $\mathcal{B}(K_L\to {\pi }^0\nu \bar{\nu })$ and other experimental constraints are also discussed.

12 pages, 3 figures

References in corpus (4)

• Big-Bang Nucleosynthesis
• $K\to \pi \pi$ $\Delta I=3/2$ decay amplitude in the continuum limit
• Singularity-free Next-to-leading Order $\Delta S=1$ Renormalization Group Evolution and ${\epsilon }_K^{\prime }/{\epsilon }_K$ in the Standard Model and Beyond
• $K_L^0\to {\pi }^0\nu \bar{\nu }$ at KOTO

Cited by in corpus (1)

• An ${\epsilon }^{\prime }$ improvement from right-handed currents