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Chargino contributions in light of recent $\epsilon'/\epsilon$ · Around

2016

Chargino contributions in light of recent $\epsilon'/\epsilon$

Endo, Motoi, Mishima, Satoshi, Ueda, Daiki et al.

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Recently, the standard model prediction of $\epsilon'/\epsilon$ 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.

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