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The tree level semileptonic $\Lambda_{b}\to pl\nu$ and $\Lambda_{c}\to nl\nu$transitions are investigated using the light cone QCD sum rules approach infull theory. The spin--1/2, $\Lambda_{Q}$ baryon with $Q=b$ or $c$, isconsidered by the most general form of its interpolating current. The timeordering product of the initial and transition currents is expanded in terms ofthe nucleon distribution amplitudes with different twists. Considering two setsof independent input parameters entering to the nucleon wave functions, namely,QCD sum rules and Lattice QCD parameters, the related form factors and theirheavy quark effective theory limits are calculated and compared with theexisting predictions of other approaches. It is shown that our results satisfythe heavy quark symmetry relations for lattice input parameters and b caseexactly and the maximum violation is for charm case and QCD sum rules inputparameters. The obtained form factors are used to compute the transition ratesboth in full theory and heavy quark effective theory. A comparison of theresults on decay rate of $\Lambda_{b}\to pl\nu$ with those predicted by otherphenomenological methods or the same method in heavy quark effective theorywith different interpolating current and distribution amplitudes of the$\Lambda_{b}$ is also presented.

Semileptonic $\Lambda_{b,c}$ to Nucleon Transitions in Full QCD at Light Cone