Higher-twist Effects in Deep-inelastic Scattering*
نویسنده
چکیده
Non-scaling, non-factorizing 1 Q2 I contributions to cross sections are derived for semi-inclusive deep-inelastic scattering, RN+ R'?TX. These higher twist terms are dominant at large z=p; pN /Q l pN. They provide unusual (l-y) terms in the cross section, as well as asymmetries in the azimuthal angle dependence. Calculations are also presented for the quark to pion fragmentation function (Submitted to Phys. Rev. Lett) * Work supported by the Department of Energy under contract number DE-AC03-76SF00515. t Permanent address,
منابع مشابه
Q Evolution of Parton Distributions at Small X. a Study of Higher-twist Effects
We investigate the Q evolution of parton distributions at small x values, obtained in the case of flat initial conditions. The contributions of twist-two and (renormalontype) higher-twist operators of the Wilson operator product expansion are taken into account. The results are in excellent agreement with deep inelastic scattering experimental data from HERA. Key-words: Quantum Chromodynamics, ...
متن کاملHigher Twist Contributions to Deep-Inelastic Structure Functions
In wide kinematic regions the deeply inelastic structure functions can be described by their leading twist contributions within Quantum Chromodynamics (QCD). Higher twist corrections [1] emerge both in the region of large [2,3] and small values [4,5] of the Bjorken variable x. The leading twist sector, both for unpolarized and polarized deeply inelastic scattering, is well explored within pertu...
متن کاملDeep Inelastic Scattering — Theory and Phenomenology A
Recent developments in theory and phenomenology relevant to deep inelastic lepton scattering are reviewed, concentrating on the following topics: predicted behaviour of non-singlet and polarized structure functions at small x; theoretical studies of saturation and unitarity effects at small x in quarkonium scattering; renormalons and higher twist contributions; next-to-leading-order calculation...
متن کاملSmall X Behavior of Parton Distributions with Flat Initial Conditions. a Study of Higher-twist Effects
We study the Q evolution of parton distributions at small x values, obtained in the case of flat initial conditions. The contributions of twist-two and (renormalontype) higher-twist operators of the Wilson operator product expansion are taken into account. The results are in good agreement with deep inelastic scattering experimental data from HERA.
متن کاملAzimuthal and single spin asymmetry in deep-inelastic lepton-nucleon scattering
We derive a general framework for describing semi-inclusive deep-inelastic lepton-nucleon scattering in terms of the unintegrated parton distributions and other higher twist parton correlations. Such a framework provides a consistent approach to the calculation of inclusive and semi-inclusive cross sections including higher twist effects. As an example, we calculate the azimuthal asymmetries to...
متن کامل