B-meson production between the Υ(4S) and Υ(6S) and the possibility of detecting B-B¯ mixing

A study is made of the quark-pair-creation model, the quarkonium-hybrid mixing model, and the unitarized quark model in connection with their ability to reproduce R≡(${\sigma }_{\mathrm{had}/{\sigma }_{\mu \mu }}$) between Υ(4S) and Υ(6S) and at the same time be consistent with all known facts about Γ and ψ systems. Models which passed the above test are used to compute all partial cross sections for pair production of B mesons. This result is used to estimate the rate for the $B_d$-B${¯}_d$ and $B_s$-B${¯}_s$ mixing effect as a function of the c.m. energy. Our result can be eventually used to search for new physics beyond the standard model.