Relativistic description of exclusive semileptonic decays of heavy mesonsстатья
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Аннотация:Using the quasipotential approach, we study exclusive semileptonic decays of heavy mesons taking into account relativistic effects. Because of a more complete relativistic description of the s quark, more precise expressions for semileptonic form factors are obtained. Various differential distributions in exclusive semileptonic decays of heavy mesons are calculated. It is argued that a consistent account of relativistic effects and a heavy quark effective theory motivated choice of the parameters of the quark-antiquark potential allow one to get a reliable value for the ratio A(2)(0)/A(1)(0) in the D --> K*l nu(l) decay as well as the ratio Gamma(D --> K*l nu(l))lr(D --> Kl nu(l)). All calculated branching ratios are in accord with available experimental data.