NEW APPROACH FOR MEASURING VERTICAL-BAR-V-UB-VERTICAL-BAR AT FUTURE B-FACTORIES

It is suggested that the measurements of hadronic invariant mass (mx) distributions in the inclusive B-->X(c(u))lv decays can be useful in e xtracting the CKM matrix element \V-ub\. We investigated hadronic inva riant mass distributions within the various theoretical models of HQET , FAC and the chiral Lagrangian as well as the ACCMM model. It is also emphasized that the mx distributions even at the region m(X)-->m(D) i n the inclusive b-->u are effective in selecting the events, experimen tally viable at the future asymmetric B factories, with better theoret ical understanding.