منابع مشابه
Strangeness and Unitarity
The strange-quark vector current form factors of the nucleon are analyzed within the framework of dispersion relations. Particular attention is paid to contributions made by KK̄ intermediate states to the form factor spectral functions. It is shown that, when the KK̄ → NN̄ amplitude is evaluated in the Born approximation, the KK̄ contributions are identical to those arising from a one-loop calculat...
متن کاملΓγ and Unitarity *
Agreement between the experimental value Γ(KS → γγ) and the number predicted via a one-loop chiral perturbation theory calculation has been cited as a success for the latter. On the other hand the one-loop prediction for the closely related process KL → π0γγ has been found to be a factor three below the experimental value. Using the inputs of unitarity and dispersion relations, we demonstrate t...
متن کاملAnd Ckm Unitarity
The Cabibbo-Kobayashi-Maskawa (CKM) [1,2] three-generation quark mixing matrix written in terms of the Wolfen-stein parameters (λ, A, ρ, η) [3] nicely illustrates the orthonor-mality constraint of unitarity and central role played by λ. V CKM = ⎛ ⎝ V ud V us V ub V cd V cs V cb V td V ts V tb ⎞ ⎠ = ⎛ ⎝ 1 − λ 2 /2 λ Aλ 3 (ρ − iη) −λ 1 − λ 2 /2 Aλ 2 Aλ 3 (1 − ρ − iη) −Aλ 2 1 ⎞ ⎠ +O(λ 4). (1) That...
متن کاملunitarity triangle as one
The quark mixing matrix with manifest Cabibbo substructure and an angle of the unitarity triangle as one of its parameters Abstract The quark mixing matrix is parameterised such that its " Cabibbo substructure " is emphasised. One can choose one of the parameters to be an arbitrarily chosen angle of the unitarity triangle, for example the angle β (also called Φ 1).
متن کاملImplications of CKM Unitarity
Three generation CKM Unitarity in the Standard Model predicts |Vud |2 + |Vus| + |Vub| = 1. Nuclear, K`3 and b → u decays currently give |Vud |2 + |Vus| + |Vub| = 0.9991(8). The good agreement between theory and experiment can be used to constrain “new physics” effects at the tree and quantum loop level. Examples considered are: exotic muon decays, heavy quark or lepton mixing, high scale induce...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 1994
ISSN: 0556-2821
DOI: 10.1103/physrevd.49.2346