Measuring~~$|V_{ub}|$~~at~~the~~LEP/SLC

Abstract

We show that the observation of energetic charged leptons from semileptonic $B$-meson decays at the LEP and SLC $Z$--boson factories offers a unique opportunity to measure the quark mixing matrix element $|V_{ub}|$. We present various distributions of the $B$ decay products to show that the $b\to u$ decays can be cleanly separated from the $b\to c$ decays, with a signal of $O(100)$ events per million $Z$ bosons produced.

Comments: 7 pages, 2 figures (not included) available (kim@cskim.yonsei.ac.kr). Talk given by C.S. Kim, at the Int. Workshop on B-physics, Nagoya, Japan, on Oct. 26--28, 1994. Proceedings published by World Scientific, Singapore, edited by A. Sanda and S. Suzuki