12 research outputs found
New physics effects in the rare B_s --> \gamma \ell^+ \ell^- decays with polarized photon
Using the most general model independent form of the effective Hamiltonian,
the rare B_s --> \gamma \ell^+ \ell^- decays are studied by taking into account
the polarization of the photon. The total and the differential branching ratios
for these decays, when photon is in the positive and negative helicity states,
are presented. Dependence of these observables on the new Wilson coefficients
are studied. It is also investigated the sensitivity of "photon polarization
asymmetry" in B_s --> \gamma \ell^+ \ell^- decays to the new Wilson
coefficients. It has been shown that all these physical observables are very
sensitive to the existence of new physics beyond SM and their experimental
measurements can give valuable information about it.Comment: 17 pages, 14 figure
Double-Lepton Polarization Asymmetries and Branching Ratio of the B\rar \gamma l^+ l^- transition in Universal Extra Dimension
We study the radiative dileptonic B \rar \gamma l^+ l^- transition in the
presence of a universal extra dimension in the Applequist-Cheng-Dobrescu model.
In particular, using the corresponding form factors calculated via light cone
QCD sum rules, we analyze the branching ratio and double lepton polarization
asymmetries related to this channel and compare the results with the
predictions of the standard model. We show how the results deviate from
predictions of the standard model at lower values of the compactification
factor () of extra dimension.Comment: 20 Pages and 8 Figure
B to strange tensor meson transition in a model with one universal extra dimension
We analyze the semileptonic transition in universal
extra dimension model. In particular, we present the sensitivity of related
observables such as branching ratio, polarization distribution and
forward-backward asymmetry to the compactification factor (1/R) of extra
dimension. The obtained results from extra dimension model show overall a
considerable deviation from the standard model predictions for small values of
the compactification factor. This can be considered as an indication for
existence of extra dimensions.Comment: 10 Pges, 6 Figures and 2 Table
Constraint on compactification scale via recently observed baryonic channel and analysis of the 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 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 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.Comment: 32 Pages, 27 Figures and one Tabl
Polarized and unpolarized lepton pair forward–backward asymmetries in B ¯ → K ¯ 0 ∗ ( 1430 ) ℓ + ℓ - and B ¯ → K ¯ ℓ + ℓ - decays in two-Higgs-doublet model
Double-lepton polarization asymmetries in Lambda(b) -> Lambda l(+)l(-) decay in universal extra dimension model
Double-lepton polarization asymmetries in Lambda(b)->Lambda l(+)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
Double-lepton polarization asymmetries in (Lambda_b -> Lambda l^+ l^-) decay in universal extra dimension model
Double-lepton polarization asymmetries in (Lambda_b -> Lambda l^+ l^-) decay are calculated in universal extra dimension (UED) model. It is obtained that numerous double-lepton polarization asymmetries are very sensitive to the UED model and therefore can be very useful tool for establishing new physics predicted by the UED model.establishing new physics predicted by the UED model