T. Aliev

Rare B{r_arrow}K{sup *}l{sup +}l{sup {minus}} decay in light cone QCD

We investigate the transition form factors for the B{r_arrow}K{sup *}l{sup +}l{sup {minus}} (l={mu},{tau}) 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{r_arrow}K{sup *}l{sup +}l{sup {minus}} lead to absolutely different q{sup 2} dependence. The invariant dilepton mass distributions for the B{r_arrow}K{sup *}{mu}{sup +}{mu}{sup {minus}} and B{r_arrow}K{sup *}{tau}{sup +}{tau}{sup {minus}} decays and final lepton longitudinal polarization asymmetry, which includes both short- and long-distance contributions, are also calculated. {copyright} {ital 1997} {ital The American Physical Society}

Lepton polarization and CP-violating effects in B→K∗τ+τ− decay in standard and two Higgs doublet models

Abstract The most general model independent expressions for the CP-violating asymmetry, longitudinal, transversal and normal polarizations of leptons are derived. Application of these general results to the concrete models such as Standard model and three different types of two Higgs doublet model is discussed.

Exclusive B→K∗ℓ+ℓ− decay with polarized K∗ and new physics effects

Using the most general, model independent effective Hamiltonian, the branching ratio of the (B -> K^* l^+ l^-) decay, when K^* meson is longitudinally or transversally polarized, is presented. The dependence of the branching ratio on the new Wilson coefficients, when K^* meson is polarized, is studied. It is observed that the branching ratio is very sensitive to the vector and tensor type interactions, which will be useful in search of new physics beyond the Standard Model.

Exclusive Λb→Λℓ+ℓ− decay beyond standard model

Using the most general, model independent form of the effective Hamiltonian, the exclusive, rare baryonic (Lambda_b -> Lambda l^+ l^- ~l=\mu,\tau) 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.

Λb→Λℓ+ℓ- decay in universal extra dimensions

We study the exclusive (Lambda_b -> \Lambda l^+ l^-) decay in the Appelquist, Chang, Dobrescu model within one universal extra dimension. We investigate the sensitivity of the branching ratio, lepton polarization and forward-backward asymmetry A_{FB} to the compactification parameter (1/R) We obtain that the branching ratio changed about 50% compared to the SM value, when (1/R=200 GeV) and zero position of the forward-backward asymmetry is shifted to the left compared to the SM result. Therefore measurement of the branching ratio of (Lambda_b -> Lambda l^+ l^-) decay and determination of zero position of A_{FB} are very useful in looking for new physics in the framework of the UED models.

Light cone QCD sum rule analysis of B → Kℓ+ℓ− decay

Abstract We calculate the transition formfactors for the B → K l + l − decay in the framework of the light cone QCD sum rules. The invariant dilepton mass distribution and the final lepton longitudinal polarization asymmetry are investigated. The comparison analysis of our results with traditional sum rules method predictions on the formfactors is performed.

Double-lepton polarization asymmetries in the

Abstract.General expressions for the double-lepton polarizations in the

B \to K \ell^ + \ell^-

B \to K \ell^ + \ell^-

decaybeyond the standard model

decay are obtained, using a model independent effective Hamiltonian, including all possible interactions. Correlations between the averaged double-lepton polarization asymmetries and the branching ratio, as well as the averaged single-lepton polarization asymmetry are studied. It is observed that a study of the double-lepton polarization asymmetries can serve as a good test for establishing new physics beyond the standard model.

Double-lepton polarization asymmetries in Λb→Λℓ+ℓ- decay in universal extra dimension model

Double-lepton polarization asymmetries in Λb→Λℓ+ℓ- decay are calculated in the universal extra dimension (UED) model. It is found that numerous double-lepton polarization asymmetries are very sensitive to the UED model and therefore can be a very useful tool for establishing new physics predicted by the UED model.