An Estimate of Twist-Four Contributions at Small xB and Low Q
نویسندگان
چکیده
We present a first study of gluonic twist-four corrections to the deep inelastic structure function F2 at small x and small Q2. The calculations are based upon the double logarithmic approximation of the coupled twist-four evolution equations of the gluonic twist-four operators that are expected to be dominant at small x. We first review the analytical results which are presently available and define the framework of our calculation. In the second part we discuss the connection with DIS diffractive dissociation which can be used to estimate the size of some of the twist-four corrections. In the final part we show, for three different choices of the input distributions, the relative magnitude of the leading-twist and the twist-four contributions.
منابع مشابه
An Estimate of Twist - Four Contributions at Small x B and Low Q 2 Jochen Bartels and Claas Bontus
We present a first study of gluonic twist-four corrections to the deep inelastic structure function F2 at small x and small Q 2. The calculations are based upon the double logarithmic approximation of the coupled twist-four evolution equations of the gluonic twist-four operators that are expected to be dominant at small x. We first review the analytical results which are presently available and...
متن کاملHigher twists in deep inelastic scattering
We perform an exploratory study of higher twist contributions to deep inelastic scattering. We estimate the size of two major sources of higher twist, namely absorptive corrections and the vector meson dominance (VMD) contribution. We find that they give a sizeable higher twist component of F2. For example at x = 0.01 it is about 8% (17%) at Q2 = 10 GeV2 (4 GeV2), reaching up to 27% at x = 10−4...
متن کاملSolution of Twist-3 Evolution Equation in Double Logarithmic Approximation in Qcd
The solution of DGLAP evolution equation for the twist-3 gluon operators is obtained in the Double Logarithmic Approximation of QCD perturbation theory. The method used for the solution is similar to the reggeon field theory. The asymptotics of the twist-3 parton correlation function for the small Bjorken variables xB is found. 1. The growth of the structure function f(xB, Q ) in the region of ...
متن کاملEffects of self-organized criticality in small−xB deep-inelastic scattering
It is pointed out that self-organized criticality (SOC) in systems of soft gluons manifest itself not only in large-rapidity gap (LRG) events, but also in normal events in small-xB deep-inelastic lepton-nucleon scattering processes. It is suggested that the following empirical facts are direct consequences of SOC in systems of interacting soft gluons which dominate the small-xB region: The stru...
متن کاملStudies of Higher Twist and Higher Order Effects in NLO and NNLO QCD Analysis
We report on the extraction of the higher twist contributions to F2 and R = σL/σT from global NLO and NNLO QCD fits to lepton nucleon scattering data over a wide range of Q 2. The NLO fits require both target mass and higher twist contributions at low Q 2. However, in the NNLO analysis, the data are described by the NNLO QCD predictions (with target mass corrections) without the need for any si...
متن کامل