Diagonal input for the evolution of off - diagonal partons
نویسنده
چکیده
We show that a knowledge of diagonal partons at a low scale is sufficient to determine the off-diagonal (or skewed) distributions at a higher scale, to a good degree of accuracy. We quantify this observation by presenting results for the evolution of off-diagonal distributions from a variety of different inputs.
منابع مشابه
ar X iv : h ep - p h / 99 05 51 7 v 1 2 7 M ay 1 99 9 1 Initial conditions and evolution of off - diagonal distributions
We briefly discuss the problem of specifying initial conditions for evolution of off-diagonal (skewed) parton distributions. We present numerical results to show that evolution rapidly washes out differences of input. Off-diagonal (or skewed) parton distributions provide important information about the nonper-turbartive structure of the nucleon [ 1]. They can in principle be measured in such pr...
متن کاملInitial conditions and evolution of off - diagonal distributions
Off-diagonal (or skewed) parton distributions provide important information about the nonperturbartive structure of the nucleon [1]. They can in principle be measured in such processes as deeply virtual Compton scattering, diffractive vector meson production or diffractive high-pT jet production. Just as for the ordinary (diagonal) parton distributions, the QCD evolution equations [2] play an i...
متن کاملOff - diagonal distributions fixed by diagonal partons at small x and ξ
We show that the off-diagonal (or skewed) parton distributions are completely determined at small x and ξ by the (conventional) diagonal partons. We present predictions which can be used to estimate the off-diagonal distributions at small x and ξ at any scale.
متن کاملQuantitative Non-diagonal Regulator Design for Uncertain Multivariable System with Hard Time-domain Constraints
In this paper a non-diagonal regulator, based on the QFT method, is synthesized for an uncertain MIMO plant whose output and control signals are subjected to hard time-domain constraints. This procedure includes the design of a non-diagonal pre-controller based on a new simple approach, followed by the sequential design of a diagonal QFT controller. We present a new formulation for the latter s...
متن کاملThe effect of off-diagonal parton distributions in diffractive vector meson electroproduction
We present a simple physical description of the off-diagonal gluon distribution g(x, x′, Q2) and splitting function Pgg(x, x ′) which enter the amplitude for diffractive vector meson production. We study the off-diagonal effects both on the evolution in Q2 and on the input distribution. We predict the ratio R of the off-diagonal to the diagonal gluon density, x′g(x, x′, Q2)/xg(x,Q2), as a funct...
متن کامل