Finding out about B mesons and B-B0 mixing on the ϒ‴ resonance

We point out that existing data on the resonance shape of ?? provide useful bounds on the B meson mass: M(??)? 2 M(B) = 9_?6⁺¹² MeV if one uses the quark pair creation model. From the upper limits on $\text{B}{}^1\text{B}\text{+}\text{B}\text{B}{}^1$ production one gets M(??) ? 2M(B) < 37 MeV. We show how measurements of inclusive semileptonic B decays allow us to determine the electromagnetic mass splitting M(B⁰) ? M(B^?) without having to identify exclusive B decays. As byproducts one obtains information on the B⁰-B^? lifetime ratio and on $\text{B}{}^0\text{-}\text{B}{}^0$ mixing.