منابع مشابه
D-brane form factors at high energy
We study the high energy, fixed angle, asymptotics of D-brane form factors to all orders in string perturbation theory, using the Gross-Mende saddle point techniques. The effective interaction size of all D-branes grows linearly with the energy as αE/n, where n is the order of perturbation theory, except for the D-instanton, whose form factor is dominated by end-point contributions, and remains...
متن کاملNucleon Form Factors in the Space- and Timelike Regions
Dispersion relations provide a powerful tool to describe the electromagnetic form factors of the nucleon both in the spacelike and timelike regions with constraints from unitarity and perturbative QCD. We give a brief introduction into dispersion theory for nucleon form factors and present results from a recent form factor analysis. Particular emphasis is given to the form factors in the timeli...
متن کاملMoving NRQCD for B Form Factors at High Recoil
We derive the continuum and lattice tree-level moving NRQCD (mNRQCD) through order 1/m. mNRQCD is a generalization of NRQCD for dealing with hadrons with nonzero velocity uμ. The quark’s total momentum is written as P = Mu + k where k ≪ Mu is discretized and Mu is treated exactly. Radiative corrections to couplings on the lattice are discussed. mNRQCD is particularly useful for calculating B → ...
متن کاملBaryon Form Factors at High Momentum Transfer and Gpd’s
Nucleon elastic and transition form factors at high momentum transfer −t are treated in terms of generalized parton distributions in a two-body framework. In this framework the high −t dependence of the form factors give information about the high k⊥ , or short distance b⊥ correlations of nucleon model wave functions. Applications are made to elastic and resonance nucleon form factors, and real...
متن کاملThe fourth dimension of the nucleon structure: spacetime analysis of the timelike electromagnetic proton form factors
As well known, spacelike proton form factors expressed in the Breit frame may be interpreted as the Fourier transform of static space distributions of electric charge and current. In particular, the electric form factor is simply the Fourier transform of the charge distribution F (q) = ∫ e ρ(r)dr. We don’t have an intuitive interpretation of the same level of simplicity for the proton timelike ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1995
ISSN: 0556-2821
DOI: 10.1103/physrevd.51.15