Bound states of heavy quarks can serve as a laboratory for inquiry into the behaviour of the fundamental strong and electroweak interactions. This thesis examines observations of B 0 , B 0 , and B ± mesons produced in proton-antiproton collisions at centre-of-mass energies of √ s = 1.8 TeV. The B-meson decay products are recorded using the Collider Detector at Fermilab (CDF) located on the Tevatron collider at the Fermi National Accelerator Laboratory in Batavia, Illinois, USA.Four B-meson decays and their charge conjugates are studied: The indicated uncertainties are statistical and systematic, respectively. In ratios involving unlike B-meson species, equal production rates for B + and B 0 mesons have been assumed.Absolute branching fractions are extracted by normalizing the above ratio measurements to the world-average value, B(B + → J/ψ K + ) = (1.01 ± 0.14) × 10 −3 :