  The kinematic edges of invariant mass distributions provide an important tool
for the possible measurements of superpartner masses in supersymmetric models
with a neutralino LSP. We examine the effect of lepton flavor dependence on the
kinematic endpoints of the di-lepton invariant mass distribution, with the
leptons being electrons and muons. In the presence of slepton mass splitting
and mixing, each of these distributions exhibits multiple edges, which are
likely to be close. Furthermore, flavor subtraction, which is usually employed
to eliminate backgrounds, dilutes the signal. We propose to extract the
endpoints from the flavor-added distribution, which is insensitive to the
slepton mixing. We also discuss the extraction of the slepton flavor parameters
in such scenarios. To demonstrate our results, we use an example with a small
slepton mass splitting of 3 GeV leading to a 6 GeV edge splitting, at both
small mixing and large mixing.
