Beauty Without Charm in B-Meson Decays

摘要

Experiments evidencing weak decays of beauty mesons without production ofparticles carrying the charm quantum number are discussed. The establishment of charmless semileptonic decays of B mesons is reported. The value of R = (V(sub ub))/(V(sub cb)) is found to be approximately 0.1--(the precise value depending on the theoretical model used in the analysis)--and definitively different from zero. A further improvement is expected and possibly a confirmation of the present determination of R from the observation of exclusive charmless semileptonic B decays such as B to rho(l)nu or B to pi(l)nu.