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Revisiting Kaon Physics in General $Z$ Scenario
- Source :
- Phys.Lett.B771 (2017) 37-44
- Publication Year :
- 2016
-
Abstract
- New physics contributions to the $Z$ penguin are revisited in the light of the recently-reported discrepancy of the direct CP violation in $K\to\pi\pi$. Interference effects between the standard model and new physics contributions to $\Delta S = 2$ observables are taken into account. Although the effects are overlooked in the literature, they make experimental bounds significantly severer. It is shown that the new physics contributions must be tuned to enhance $\mathcal{B}(K_L \to \pi^{0} \nu \bar{\nu})$, if the discrepancy of the direct CP violation is explained with satisfying the experimental constraints. The branching ratio can be as large as $6 \times 10^{-10}$ when the contributions are tuned at the 10 % level.<br />Comment: 18 pages, 6 figures; v2: references added, some contributions included in light of gauge invariance; v3: to be published in Phys. Lett. B
- Subjects :
- High Energy Physics - Phenomenology
High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys.Lett.B771 (2017) 37-44
- Publication Type :
- Report
- Accession number :
- edsarx.1612.08839
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.physletb.2017.05.026