K→πvv:New Contributions from Unit-Charged Scalars in Topcolor-Assisted Technicolor Models

摘要

We calculate the new contributions to the rare K-decays K^(+)→π^(+)vv and K_(L)→π^(0)vv from the unit-charged scalars appearing in the topcolor-assisted technicolor models.By using the square-root ansatz for the mixing matrices D_(L)and D_(R),we find that:(a)the new contributions from top-pionsπ^(~±)and b-pions^(~H±)dominate over that from ordinary technipionsπ1 andπs;(b)for aR^(ts*)aR^(td)=-1/4,the enhancements to the ratios B(K^(+)→π^(+)vv)and B(K_(L)→π^(0)vv)from new scalars can be as large as a factor 7 and 11,respectively;(c)the theoretical predictions are still consistent with the data after including the new contributions.