Year: 2006
Type: article
Abstract: We analyze the impact of Higgs-mediated amplitudes on the rare decays ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ in the MSSM with large $\mathrm{tan}\ensuremath{\beta}$ and general flavor mixing. We point out that, going beyond the minimal flavor violation hypothesis, $Z$-penguin amplitudes generated by charged-Higgs exchange can induce sizable modifications of $K\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ rates. Interestingly, these effects scale as ${tan}^{4}\ensuremath{\beta}$ at the amplitude level. For large values of $\mathrm{tan}\ensuremath{\beta}$, this mechanism allows deviations from the SM expectations even for tiny (Cabibbo-Kobayashi-Maskawa--type) off-diagonal mixing terms in the right-handed squark sector.
Authors: Gino Isidori, Paride Paradisi
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2594129502