Abstract
It is discussed how two models which were proposed to explain the lifetime difference betweenD0 andD+ mesons can be subjected to further tests. These two models are the “SU (4) 20-plet dominance” model and the “gluon bremstrahlung” model forW exchange. The tests can be performed by studying inclusive decays—e.g.,F+ lifetime or semi-leptonic branching ratio—or special exclusive modes in the non-leptonic and semileptonic decays. It is suggested thatF+ semi-leptonic decays can lead to glueball production. The decays of bottom mesons are discussed in this context, too.
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