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As fundamental observables in quantum field theory and string theory, scattering amplitudes have played a central role in fundamental physics. During recent years tremendous progress has been made in ...
Long distance chiral corrections in beta meson amplitudes
Long distance physics meson area of computational physics quality
2014/12/20
We discuss the chiral corrections to fB and BB with particular emphasis on determining the portion of the correction that arises from long distance physics. For very small pion and kaon masses all of ...
Oscillatory critical amplitudes in hierarchical models and the tail of the Harris random variable
hierarchical models iteration of polynomial maps oscillatory critical amplitudes Harris random variable geometry of Julia set
2012/6/27
Oscillatory critical amplitudes have been repeatedly observed in hierarchical models and, in the cases that have been taken into consideration, these oscillations are so small to be hardly detectable....
Light Meson Distribution Amplitudes
Light Meson Distribution Amplitudes High Energy Physics
2011/1/6
We calculated the first two moments of the light-cone distribution amplitudes for the pseudoscalar mesons ($\pi$ and $K$) and the longitudinally polarised vector mesons ($\rho$, $K^*$ and $\phi$) as p...
Light Meson Distribution Amplitudes
Light Meson Distribution Amplitudes High Energy Physics
2011/1/6
We calculated the first two moments of the light-cone distribution amplitudes for the pseudoscalar mesons ($\pi$ and $K$) and the longitudinally polarised vector mesons ($\rho$, $K^*$ and $\phi$) as p...
The anti-quark--quark potential from Bethe-Salpeter amplitudes on lattice
The anti-quark--quark potential Bethe-Salpeter amplitudes
2011/1/6
Potentials of quark--anti-quark pairs are studied from the anti-q--q Nambu-Bethe-Salpeter (NBS) wave functions in quenched lattice QCD. With the use of a method which has been recently developed in th...
The anti-quark--quark potential from Bethe-Salpeter amplitudes on lattice
The anti-quark--quark potential Bethe-Salpeter amplitudes
2011/1/6
Potentials of quark--anti-quark pairs are studied from the anti-q--q Nambu-Bethe-Salpeter (NBS) wave functions in quenched lattice QCD. With the use of a method which has been recently developed in th...
Gluon Scattering Amplitudes in Finite Temperature Gauge/Gravity Dualities
Gluon Scattering Amplitudes Temperature Gauge/Gravity Dualities
2010/12/24
We examine the gluon scattering amplitude in N=4 super Yang-Mills at finite temperature with nonzero R-charge densities, and in Non-Commutative gauge theory at finite temperature. The gluon scattering...
On KLT and SYM-supergravity relations from 5-point 1-loop amplitudes
KLT SYM-supergravity relations 5-point 1-loop amplitudes
2010/12/23
We derive a new non-singular tree-level KLT relation for the $n=5$-point amplitudes, with manifest $2(n-2)!$ symmetry, using information from one-loop amplitudes and IR divergences, and speculate how...
Lattice Results for Low Moments of Light Meson Distribution Amplitudes
Low Moments of Light Meson Distribution Amplitudes
2011/1/14
As part of the UKQCD and RBC collaborations’ Nf = 2+1 domain-wall fermion phenomenology
programme, we calculate the first two moments of the light-cone distribution amplitudes of the
pseudoscalar me...
The QCDSF collaboration has investigated the distribution amplitudes and wavefunction normalization constants of the nucleon and its parity partner, the $N^* (1535)$. We report on recent progress in t...
In this paper, we study the tree amplitudes with gluons coupled to gravitons. We first study the relations among the mixed amplitudes. With BCFW on-shell recursion relation, we will show the color-ord...
Lattice Results for Low Moments of Light Meson Distribution Amplitudes
Lattice Results Low Moments Light Meson Distribution Amplitudes
2011/1/7
As part of the UKQCD and RBC collaborations' N_f=2+1 domain-wall fermion phenomenology programme, we calculate the first two moments of the light-cone distribution amplitudes of the pseudoscalar meson...
Writing CFT correlation functions as AdS scattering amplitudes
Writing CFT correlation functions AdS scattering amplitudes
2010/12/23
We explore the Mellin representation of conformal correlation functions recently proposed by Mack. Examples in the AdS/CFT context reinforce the analogy between Mellin amplitudes and scattering amplit...
Efficient Tree-Amplitudes in N=4: Automatic BCFW Recursion in Mathematica
Efficient Tree-Amplitudes in N=4 Automatic BCFW Recursion Mathematica
2010/12/27
We describe an efficient implementation of the BCFW recursion relations for tree-amplitudes in N=4 super Yang-Mills, which can generate analytic formulae for general N^kMHV colour-ordered helicity-amp...