نتایج جستجو برای: l model
تعداد نتایج: 2651627 فیلتر نتایج به سال:
The branching ratio, forward–backward asymmetry and CP violating asymmetry for B → Xd l+l− decay, in framework of the general two Higgs doublet model, with extra phase angle in the charged–Higgs–fermion coupling, are calculated. It is shown that studying the CP violating asymmetry is an efficient tool for establishing new
We study the polarized lepton pair forward–backward asymmetries inB → K∗l+l− decay using the most general, model independent form of the effective Hamiltonian. We present the general expression for nine double–polarization forward–backward asymmetries. It is shown that, the study of the forward–backward asymmetries of the doubly–polarized lepton pair is a very useful tool for establishing new p...
Leaf area information is required in various horticultural and physiological studies and it will be more useful if done via non-destructive methods. The objective of this study was to establish equations to estimate leaf area (LA) using length (L), width (W), fresh weight (FW), dry weight (DW), length × length (L2), width × width (W2), length × width (L×W), length + width (L+W), fresh weight × ...
The presence of humic acid (HA) in water treatment processes is very harmful and the cause of undesirable color, taste, and smell. Drinking water containing high concentrations of humic substances can be the cause of many health problems. Therefore, the removal of these compounds from water resources is a very important topic. In this research, response surface methodology (RSM) has been used t...
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
Background and Objective: The concentration of nitrate, factors affecting the balance sheet, and the changes in an aquifer is of utmost importance. Because modeling is an efficient method to predict the concentration of ions in water resources, in this study using lumped-parameter model and Monte Carlo simulation model, the nitrate concentrations in groundwater resources of Qazvin Plain were es...
We investigate the influence of the fourth generation quarks on the branching ratio and the CP-asymmetry in B → πℓ + ℓ − decay. Taking the |V t ′ d V t ′ b | ∼ 0.001 with phase about 10 • , which is consistent with the sin2φ 1 of the CKM and the B d mixing parameter ∆m B d , we obtain that for both (µ, τ) channels the branching ratio, the magnitude of CP-asymmetry and lepton polarization depict...
The general analysis of lepton polarization asymmetries in rare B → K∗l+l− decay is investigated. Using the most general, model independent effective Hamiltonian, the general expressions of the longitudinal, normal and transversal polarization asymmetries for l and l+ and combinations of them are presented. The dependence of lepton polarizations and their combinations on new Wilson coefficients...
We briefly review the status of rare radiative and semileptonic b → s(γ, ll), (l = e, μ) decays. We discuss possible signatures of new physics in these modes and emphazise the role of the exclusive channels. In particular, measurements of the Forward-Backward asymmetry in B → Kll decays and its zero provide a clean test of the Standard Model, complementary to studies in b → sγ decays. Further, ...
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