9 papers · 1 filter
Minimal Lee-Wick Extension of the Standard Model
Christopher D. Carone, Richard F. Lebed
We consider a minimal Lee-Wick (LW) extension to the Standard Model in which the fields providing the most important contributions to the cancellation of quadratic divergences are…
Pion Form Factor in Improved Holographic QCD Backgrounds
Herry J. Kwee, Richard F. Lebed
We extend a recent numerical calculation of the pion electromagnetic form factor F_π(Q^2) in holographic QCD to study two important issues regarding the behavior of fields in the b…
An Identity on SU(2) Invariants
Herry J. Kwee, Richard F. Lebed
We prove an identity [Eq. (1) below] among SU(2) 6j and 9j symbols that generalizes the Biedenharn-Elliott sum rule. We prove the result using diagrammatic techniques (briefly revi…
Pion Form Factors in Holographic QCD
Herry J. Kwee, Richard F. Lebed
Using a holographic dual model of QCD, we compute the pion electromagnetic form factor F_pi(Q^2) in the spacelike momentum transfer region, as well as pion couplings to vector meso…
1/N_c Corrections in Meson-Baryon Scattering
Herry J. Kwee, Richard F. Lebed
Corrections to meson/ground-state baryon scattering amplitudes in the 1/N_c expansion of QCD have previously been shown to be controlled by the t-channel difference |I_t - J_t| of…
On Radiative Weak Annihilation Decays
Richard F. Lebed
We discuss a little-studied class of weak decay modes sensitive to only one quark topology at leading order in G_F: M --> m gamma, where M,m are mesons with completely distinct fla…