Form Factors for Exclusive Semileptonic $B$--Decays
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We developed the new parton model approach for exclusive semileptonic decays of $B$-meson to $D,~D^*$ by extending the inclusive parton model, and by combining with the results of the HQET, motivated by Drell-Yan process. Without the nearest pole dominance ansätze, we {\bf derived} the dependences of hadronic form factors on $q^2$. We also calculated numerically the slope of the Isgur-Wise function, which is consistent with the experimental results.
20 pages, RevTex, 2 ps figure files(uuencoded in seperate file)
20 pages, RevTex, 2 ps figure files(uuencoded in seperate file)