The radiative dileptonic decays B s (B d )→l ϩ l Ϫ ␥ (lϭe,) are investigated within the standard model. The transition form factors are calculated in the framework of the light cone QCD sum rule method and it is found that the branching ratios areA comparison of our results with the constituent quark model predictions on the branching ratios is presented.

Taking into account the à baryon distribution amplitudes and the most general form of the interpolating current of the à b , the semileptonicÀ transition is investigated in the framework of the light cone QCD sum rules. Sum rules for all 12 form factors responsible for the à b ! Ã' þ ' À decay are constructed. The obtained results for the form factors are used to compute the branching fraction. A comparison of the obtained results with the existing predictions of the heavy quark effective theory is presented. The results of the branching ratio shows the detectability of this channel at the Large Hadron Collider beauty in the near future is quite high.

We investigate the transition form factors for the B→K*l ϩ l Ϫ (lϭ,) decay in light cone QCD. It is found that the light cone and three-point QCD sum rule analyses for some of the form factors for the decay B→K*l ϩ l Ϫ lead to absolutely different q 2 dependence. The invariant dilepton mass distributions for the B→K* ϩ Ϫ and B→K* ϩ Ϫ decays and final lepton longitudinal polarization asymmetry, which includes both short-and long-distance contributions, are also calculated.

The nucleon electromagnetic form factors are calculated in light cone QCD sum rules framework using the most general form of the nucleon interpolating current. Using two forms of the distribution amplitudes (DA's), predictions for the form factors are presented and compared with existing experimental data. It is shown that our results describe remarkably well the existing experimental data.

The coupling constant g ρσγ is determined from light cone QCD sum rules. A comparison of our result with the ones existing in literature is presented.

We calculate the mass and residue of the heavy spin-1/2 baryons containing two heavy b or c quarks in the framework of QCD sum rules. We use the most general form of the interpolating current in its symmetric and anti-symmetric forms with respect to the exchange of heavy quarks, to calculate the two-point correlation functions describing the baryons under consideration. A comparison of the obtained results with existing predictions from various approaches is also made.

Using the most general, model independent form of the effective Hamiltonian, the exclusive, rare baryonic Λ b → Λℓ + ℓ − (ℓ = µ, τ ) decay is analyzed. We study sensitivity of the branching ratio and lepton forward-backward asymmetry to the new Wilson coefficients. Is is shown that these physical quantities are quite sensitive to the new Wilson coefficients. Determination of the position of zero value of the forward-backward asymmetry can serve as a useful tool for establishing new physics beyond the standard model, as well as fixing the sign of the new Wilson coefficients.

The radiative B c → ℓνγ decay is investigated in the Standard Model in framework of the light cone QCD. The transition form factors and decay width are calculated.A comparison of light cone QCD and constituent quark model predictions on these quantities is presented. *