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We search for the flavor-changing neutral current decays D0 ! μ+μ− and D0 ! e+e−, and for the
lepton-flavor violating decays D0 ! e±μ using 660 fb−1 of data collected with the Bell...
We review the physics of purely leptonic decays of $\pi^\pm$, $K^\pm$, $D^{\pm}$, $D_s^\pm$, and $B^\pm$ pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-i...