Parton interactions in the Bjorken asymptotics

Parton interaction in super

We apply the effective action scheme to the leading parton interactions in N = 1 supersymmetric gauge theory. The effective interaction in the Bjorken asymp-totics at one loop is written in terms of parton superfield vertices explicitely symmetric with respect to superconformal transformations.

Parton interactions in the Bjorken limit of QCD 1

We consider the Bjorken limit in the framework of the effective action approach and discuss its similarities to the Regge limit. The proposed effective action allows for a rather simple calculation of the known evolution kernels. We represent the result in terms of two-parton interaction operators involving gluon and quark operators depending on light-ray position and helicity and analyze their...

Can We Measure Parton - Parton Cross Sections ?

Photon interactions in ultra-peripheral heavy-ion collisions in the ATLAS detector at the LHC

Two analyses involving photon interactions in ultra-peripheral lead-lead collisions in the ATLAS detector at the LHC are described, namely the study of dijet production in photo-nuclear ultra-peripheral collisions and a measurement of light-by-light scattering. The first, is an important way to probe and constrain nuclear parton distribution functions, which are known to exhibit suppression at ...

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN–TH/7216/94 April 1994 THE THEORY AND PHENOMENOLOGY OF POLARIZED DEEP INELASTIC SCATTERING

CONTENTS 1) Introduction 1.1) Notation 2) Polarized lepton-nucleon deep inelastic scattering – general aspects 2.1) General formalism in the one photon exchange approximation 2.1.1) Structure functions and Bjorken scaling 2.1.2) Cross-section differences 2.1.3) Experimental measurement of g 1 and g 2 on nucleon targets a) Longitudinally polarized target b) Transversely polarized target c) Combi...