منابع مشابه
lνγ Form Factors at Two - loop
Within Chiral Perturbation Theory (CHPT) we compute the form factors A, V and γ = A/V in the π → lνγ decay to O(p 6).
متن کاملTwo-Loop Form Factors in QED
We evaluate the on shell form factors of the electron for arbitrary momentum transfer and finite electron mass, at two loops in QED, by integrating the corresponding dispersion relations, which involve the imaginary parts known since a long time. The infrared divergences are parameterized in terms of a fictitious small photon mass. The result is expressed in terms of Harmonic Polylogarithms of ...
متن کاملForm Factors for B → π and D → π Transitions
Armed with the information on the form factor f + (0) inferred from recent CLEO measurements of SU(3)-breaking effects in charmed meson decays, we have studied the form factor f + . In the heavy quark limit, f Bπ + (q ) is related to f + (q ) in the kinematic region close to zero recoil. Assuming pole dominance for its q dependence, f + (0) is estimated to be ≈ 0.39 . If the requirement of heav...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1997
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(97)00069-2