Where are theBB¯mixing effects observable in theΥregion?

Abstract

We estimate the $B_d$-B${¯}_d$ and $B_s$-B${¯}_s$ mixing effects using computed production cross sections for $B_q$B${¯}_q$, $B_q$B${¯}_q^{\mathrm{*}}$+c.c., $B_q^{\mathrm{*}}$B${¯}_q^{\mathrm{*}}$ (q=d,s) in the region from Υ(4S) to Υ(7S). It is shown that the mixing signal of same-sign leptons will peak at Υ(5S) under the assumption of standard model estimates, and if the total integrated luminosity of 1000 ${\mathrm{pb}}^{\mathrm{-}1}$ is achieved, it will be observable.