Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-08-07
Rev.Mod.Phys.67:893-976,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
This review article will be published in Reviews of Modern Physics in the fall, 1995. This file contains only the abstract and
Scientific paper
10.1103/RevModPhys.67.893
We review the experimental measurements and theoretical descriptions of leptonic and semileptonic decays of particles containing a single heavy quark, either charm or bottom. Measurements of bottom semileptonic decays are used to determine the magnitudes of two fundamental parameters of the standard model, the Cabibbo-Kobayashi-Maskawa matrix elements $V_{cb}$ and $V_{ub}$. These parameters are connected with the physics of quark flavor and mass, and they have important implications for the breakdown of CP symmetry. To extract precise values of $|V_{cb}|$ and $|V_{ub}|$ from measurements, however, requires a good understanding of the decay dynamics. Measurements of both charm and bottom decay distributions provide information on the interactions governing these processes. The underlying weak transition in each case is relatively simple, but the strong interactions that bind the quarks into hadrons introduce complications. We also discuss new theoretical approaches, especially heavy-quark effective theory and lattice QCD, which are providing insights and predictions now being tested by experiment. An international effort at many laboratories will rapidly advance knowledge of this physics during the next decade.
Burchat Patricia R.
Richman Jeffrey D.
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