Abstract We study the pion electromagnetic form factor in modulus squared dispersion relation, and do model independent extraction of chiral mass embedded sub-leading twist light-cone distribution amplitude. The motivation this work is recent measurement timelike resonant regions, which makes up piece lacking solid QCD-based calculation. With perturbative QCD calculation to next-to-leading-orde...

A Poincaré covariant Faddeev equation, which describes baryons as composites of confined-quarks and -nonpointlike-diquarks, is solved to obtain masses and Faddeev amplitudes for the nucleon and ∆. The amplitudes are a component of a nucleon-photon vertex that automatically fulfills the Ward-Takahashi identity for on-shell nucleons. These elements are sufficient for the calculation of a quark co...

The electromagnetic form factor is extracted from both components of the electromagnetic current: J+ and J− with a pseudo-scalar coupling of the quarks to the kaon. In the case of J+ there is no pair term contribution in the Drell-Yan frame (q+ = 0). However, J− component of the electromagnetic current the pair term contribution is different from zero and is necessary include it to preserve the...

First time a theoretical prediction of the neutron electromagnetic form factors behaviors in whole region their definition by use proton data only is demonstrated. This could be achieved framework unitary and analytic approach to description nucleon with canonical normalization conditions, QCD (up logarithmic correction) asymptotic specific transformation properties current isotopic space.

Germany bSchool of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK cInstitut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany dSchool of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, UK eJohn von Neumann-Institut für Computing NIC / DESY, 15738 Zeuthen, Germany f Theoretical Physics Division, Department of Mathematical S...

Electromagnetic form factors of the nucleon and its excitations (baryon resonances) provide a powerful tool to investigate the structure of the nucleon. These form factors can be measured in electroproduction as a function of the four-momentum squared q = −Q of the virtual photon. In this contribution we present a simultaneous study of the elastic form factors of the nucleon and the transition ...

magnetotelluric (mt) method is an electromagnetic technique that uses the earth natural field to map the electrical resistivity changes in subsurface structures. because of the high penetration depth of the electromagnetic fields in this method (tens of meters to tens of kilometers), the mt data is used to investigate the shallow to deep subsurface geoelectrical structures and their dimensions....