  The study of deeply bound kaon states is usually carried out or proposed
using $K^-$ or $\pi^+$ beams with fixed nuclear target or proton proton
interactions or, more recently, heavy ion collisions. The extension of the
measurements to different and new environments could allow to clarify their
possible existence. The high luminosity of 10$^{36}$cm$^{-2}$s$^{-1}$, which
will be achieved at future B-factories, both in Italy and in Japan, opens the
possibility to search for deeply bound kaon states in the vacuum, in the
glue-rich $\Upsilon(nS)$ decays. Here the opportunity to perform a measurement
of the simplest kaonic nuclear state, the $K^-pp$ and other bound states, at
B-factories is discussed.
