S. Kartal

Constraint on compactification scale via recently observed baryonic Λb → Λℓ+ℓ− channel and analysis of the Σb → Σℓ+ℓ− transition in SM and UED scenario

We obtain a lower limit on the compactification scale of extra dimension via comparison of the branching ratio in the baryonic Λb → Λμ+μ− decay channel recently measured by CDF collaboration and our previous theoretical study. We also use the newly available form factors calculated via light cone QCD sum rules in full theory to analyze the flavour changing neutral current process of the Σb → Σl+l− in universal extra dimension scenario in the presence of a single extra compact dimension. We calculate various physical quantities like branching ratio, forward-backward asymmetry, baryon polarizations and double lepton polarization asymmetries defining the decay channel under consideration. We also compare the obtained predictions with those of the standard model. PACS number(s): 12.60-i, 13.30.-a, 13.30.Ce, 14.20.Mr e-mail: kazizi@dogus.edu.tr e-mail: sehban@istanbul.edu.tr e-mail: nkatirci@dogus.edu.tr e-mail: a.t.olgun@gmail.com.tr e-mail: z.tavukoglu@gmail.com.trA bstractWe obtain a lower limit on the compactification scale of extra dimension via comparison of the branching ratio in the baryonic Λb → Λμ+μ− decay channel recently measured by CDF collaboration and our previous theoretical study. We also use the newly available form factors calculated via light cone QCD sum rules in full theory to analyze the flavour changing neutral current process of the Σb → Σℓ+ℓ− in universal extra dimension scenario in the presence of a single extra compact dimension. We calculate various physical quantities like branching ratio, forward-backward asymmetry, baryon polarizations and double lepton polarization asymmetries defining the decay channel under consideration. We also compare the obtained predictions with those of the standard model.

Analysis of the semileptonic

We comparatively analyze the flavor changing neutral current process of the

\Lambda_b\rightarrow \Lambda \ell^+ \ell^-

\Lambda_b \rightarrow \Lambda \ell^+ \ell^-

transition in the topcolor-assisted technicolor model

in the standard model as well as topcolor-assisted technicolor model using the form factors calculated via light cone QCD sum rules in full theory. In particular, we calculate the decay width, branching ratio and lepton forward-backward asymmetry related to this decay channel. We compare the results of the topcolor-assisted technicolor model with those of the standard model and debate how the results of the topcolor-assisted technicolor model depart from the standard model predictions. We also compare our results on the differential branching ratio with recent experimental data provided by CDF and LHCb Collaborations.

Analysis of the semileptonic Λ b → Λ ℓ + ℓ − transition in the topcolor-assisted technicolor model

We comparatively analyze the flavor changing neutral current process of the

Comparative analysis of the semileptonic Λ b → Λℓ + ℓ − transition in SM and different SUSY scenarios using form factors from full QCD

\Lambda_b \rightarrow \Lambda \ell^+ \ell^-

Radiative Σb→Σγ decay in SM and BSM

in the standard model as well as topcolor-assisted technicolor model using the form factors calculated via light cone QCD sum rules in full theory. In particular, we calculate the decay width, branching ratio and lepton forward-backward asymmetry related to this decay channel. We compare the results of the topcolor-assisted technicolor model with those of the standard model and debate how the results of the topcolor-assisted technicolor model depart from the standard model predictions. We also compare our results on the differential branching ratio with recent experimental data provided by CDF and LHCb Collaborations.

Radiative

A bstractWe work out the semileptonic Λb → Λℓ+ℓ− transition in standard as well as different supersymmetric models. In particular, considering the parametrization of the matrix elements entered the low energy effective Hamiltonian in terms of form factors in full QCD, we calculate the amplitude and differential decay rate responsible for this decay channel in supersymmetric models. We then use the form factors calculated via light cone QCD sum rules in full theory to analyze the differential branching ratio and lepton forward-backward asymmetry of this decay channel in different supersymmetric models and compare the obtained results with those of the standard model. We also discuss how the results of different supersymmetric models deviate from the standard model predictions and which SUSY scenarios are favored.

{{\Sigma }_{b}}\to \Sigma \gamma

Using transition form factors calculated via light cone QCD sum rules in full theory, we comparatively analyze the rare radiative decay in the standard model (SM) and models with one or two universal extra dimensions, such as beyond the SM scenarios. We estimate the total decay width and branching ratio associated with this decay channel in the SM and compare the obtained results with those of scenarios with one or two universal extra dimensions. We discuss how the results of universal extra dimensional models approach the SM predictions when the compactification factor of extra dimension is increased.

decay in SM and BSM

Using transition form factors calculated via light cone QCD sum rules in full theory, we comparatively analyze the rare radiative decay in the standard model (SM) and models with one or two universal extra dimensions, such as beyond the SM scenarios. We estimate the total decay width and branching ratio associated with this decay channel in the SM and compare the obtained results with those of scenarios with one or two universal extra dimensions. We discuss how the results of universal extra dimensional models approach the SM predictions when the compactification factor of extra dimension is increased.