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We present a general study on exclusive semileptonic decays of heavy (B, D,B_s) to light (pi, rho, K, K^*) mesons in the framework of effective fieldtheory of heavy quark. Transition matrix elements of these decays can besystematically characterized by a set of wave functions which are independentof the heavy quark mass except for the implicit scale dependence. Form factorsfor all these decays are calculated consistently within the effective theoryframework using the light cone sum rule method at the leading order of 1/m_Qexpansion. The branching ratios of these decays are evaluated, and the heavyand light flavor symmetry breaking effects are investigated. We also givecomparison of our results and the predictions from other approaches, amongwhich are the relations proposed recently in the framework of large energyeffective theory.Comment: 18 pages, ReVtex, 5 figures, added references and comparison of  results, and corrected signs in some formula

Heavy to light meson exclusive semileptonic decays in effective field theory of heavy quarks