New physics effects in Λb → Λl+l− decay with lepton polarizations
نویسنده
چکیده
We study lepton polarization asymmetries in the Λb → Λl+l− decay using the most general model independent effective Hamiltonian. The dependence of the lepton polarizations and their combinations on the new Wilson coefficients are studied in detail. It is observed that there is a region for the new Wilson coefficients for which the branching ratio coincides with the standard model prediction, while lepton polarizations show considerable departure from standard model. PACS numbers: 12.60.–i, 13.30.–a, 14.20.Mr e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]
منابع مشابه
The Effects of Fourth Generation on the Total Branching Ratio and the Lepton Polarization in Λ b → Λ l + l − decay
This study investigates the influence of the fourth generation quarks on the total branching ratio and the single lepton polarizations in Λb → Λl+l− decay. Taking |Vt′sVt′b| ∼ {0.01− 0.03} with phase just below 90◦, which is consistent with the b → sl+l− rate and the Bs mixing parameter ∆mBs , we obtain that the total branching ratio and the single lepton(μ, τ) polarizations are quite sensitive...
متن کاملThe Effects of Fourth Generation in Single Lepton Polarization on Λ b → Λ l + l − decay
This study investigates the influence of the fourth generation quarks on the single lepton polarizations in Λb → Λl+l− decay. Taking |Vt′sVt′b| ∼ {0.01 − 0.03} with phase just below 90◦, which is consistent with the b → sl+l− rate and the Bs mixing parameter ∆mBs , we obtain that single lepton(μ, τ) polarizations are quite sensitive to the existence of fourth generation. It can serve as a good ...
متن کاملDouble–lepton polarization asymmetries in Λb → Λl+l− decay
Double–lepton polarization asymmetries in Λb → Λl+l− decay are calculated using a general, model independent form of the effective Hamiltonian. The sensitivities of these asymmetries to the new Wilson coefficients are studied in detail. Furthermore, the correlations between averaged double–lepton polarization asymmetry and branching ratio are analyzed. It is shown that there exist certain regio...
متن کاملDouble–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 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. PACS numbers: 12.60.–i, 13.30.–a, 14.20.Mr e-mail: [email protected] permanent ad...
متن کاملForward–backward asymmetries in Λb → Λl+l− decay beyond the standard model
We study the doubly–polarized lepton pair forward–backward asymmetries in Λb → Λl+l− decay using a general, model independent form of the effective Hamiltonian. We present the general expression for nine double–polarization forward– backward asymmetries. It is observed that, the study of the forward–backward asymmetries of the doubly–polarized lepton pair is a very useful tool for establishing ...
متن کامل