
\subsection*{Tau Physics}
\vskip-8pt
It is not unlikely that the most exciting results on New Physics in the flavor sector at \superb\ will be found in $\tau$ decays. With 75 ab$^{-1}$ \superb\ can cover a significant portion of the parameter space of most New Physics scenarios predictions for lepton flavor violation (LFV) in tau decays.

The sensitivity in radiative processes such as ${\cal B}(\tau\rightarrow\mu\gamma)$ ($2\times 10^{-9}$) and in ${\cal
B}(\tau\rightarrow\mu\mu\mu)$ decays ($2\times 10^{-10}$) gives \superb\ a real chance to observe these LFV decays. These
measurements are complementary to searches for $\mu\rightarrow e\gamma$ decay. In fact, the ratio
$\BR(\tau\rightarrow\mu\gamma)/\BR(\mu\rightarrow e\gamma)$ is an important diagnostic of SUSY-breaking scenarios. 
If LFV decays such us $\tau\rightarrow\mu\gamma$ and $\tau\rightarrow\mu\mu\mu$ are found, the polarized electron beam of \superb provides us with a means of determining the helicity structure of the LFV coupling, a most exciting prospect. The polarized beam also provides a novel additional handle on backgrounds to these rare processes.

The longitudinally polarized high energy ring electron beam, which is a unique feature of \superb, is also the key to searching for \CP violation in tau production or decay. An asymmetry in production would signal a $\tau$ EDM, with a sensitivity of $\sim 10^{-19}\ e$cm, while an unexpected \CP-violating asymmetry in decay would be a clear signature of New Physics.

The polarized beam and the ability to procure a data sample of sufficient size to find lepton flavor-violating events, as opposed to setting limits on LFV processes are unique to \superb.




