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

Daiki Ueda; Kei Yamamoto; Motoi Endo; Satoshi Mishima

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

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arxiv 1608.01444 v1 pith:VBTHRJA5 submitted 2016-08-04 hep-ph hep-ex

Motoi Endo , Satoshi Mishima , Daiki Ueda , Kei Yamamoto This is my paper · ORCID

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keywords epsiloncharginocontributionsdiscrepancyexperimentalvacuumconstraintconstraints

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abstract

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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Correlating $\epsilon^\prime/\epsilon$ to hadronic $B$ decays via $U(2)^3$ flavour symmetry
hep-ph 2019-09 conditional novelty 6.0 of 10

A U(2)^3 flavour-symmetric effective field theory can consistently explain the epsilon'/epsilon anomaly and hadronic B decay CP asymmetries, with a global fit about 3 sigma better than the Standard Model.

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