Matrix Elements and the Determination of the Weak Mixing Angles
نویسندگان
چکیده
The main goal of this talk is to review a new method’ for predicting, from QCD, the weak matrix elements that are needed to describe the semileptonic decays; B -+ DePe,,B + D’ec, and Ab + A,eti,. The method also relates B + pe& semileptonic decay to D + pZuc semileptonic decay. Since these are exclusive decays involving hadronic states nonperturbative strong interaction physics plays a role. The basic idea is to examine QCD in the limit where the heavy charm and bottom quark masses to go infinity. In this limit, QCD has new symmetries that allow us to get a handle on the nonperturbative strong interaction physics that occurs in the semileptonic decays of hadrons containing a single heavy quark.
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