Extraction Of Structure Function Research Articles

Extraction of structure functions for lepton-nucleus scattering in the quasi-elastic region

Extraction of structure functions for lepton-nucleus scattering in the quasi-elastic region

QCD PRECISION MEASUREMENTS AND STRUCTURE FUNCTION EXTRACTION AT A HIGH STATISTICS, HIGH ENERGY NEUTRINO SCATTERING EXPERIMENT: NuSOnG

We extend the physics case for a new high-energy, ultra-high statistics neutrino scattering experiment, NuSOnG (Neutrino Scattering On Glass) to address a variety of issues including precision QCD measurements, extraction of structure functions, and the derived Parton Distribution Functions (PDF's). This experiment uses a Tevatron-based neutrino beam to obtain a sample of Deep Inelastic Scattering (DIS) events which is over two orders of magnitude larger than past samples. We outline an innovative method for fitting the structure functions using a parametrized energy shift which yields reduced systematic uncertainties. High statistics measurements, in combination with improved systematics, will enable NuSOnG to perform discerning tests of fundamental Standard Model parameters as we search for deviations which may hint of "Beyond the Standard Model" physics.

Extraction of Structure Function and Gluon DistributionFunction at Low-x from Cross Section Derivative by Regge Behavior

An approximation method based on Regge behavior is presented.This new method relates the reduced cross section derivative andthe structure function Regge behavior at low x. With theuse of this approximation method, the C and λ parametersare calculated from the HERA reduced cross section data taken atlow-x. Also, we calculate the structure functionsF2(x,Q2) even for low-x values, which have not beeninvestigated. To test the validity of calculated structurefunctions, we find the gluon distribution function in the Leadingorder approximation based on Regge behaviour of structure functionand compare to the NLO QCD fit to H1 data and NLO partondistribution function.

An Alternative Approach to the Extraction of Structure Functions in Deep Inelastic e-p Scattering at 5 to 20 GeV

Two structure functions and are determined by using the cross sections measured in the deep inelastic electron-proton scattering experiments at Stanford Linac in the energy range of 5 to 20 GeV. In this paper an alternative mathematical approach have been used in such determination, resulting in a larger number of points in the graphs of the structure functions.

Phase shift analysis and extraction of structure functions for Coulomb distortion on (e, e'p) reactions at high electron energies

In this paper we improve our approximate phase shifts of the electron wave functions by including Coulomb distortion effects from medium and heavy nuclei on exclusive (e, e'p) reactions in the quasielastic region. The new phase shifts are parameterized for the elastic electron scattering and work very well at incident electron energies greater than 300 MeV. The structure functions with the new phase shifts for the electron wave functions are extracted. We use a relativistic single-particle model as applied to 208Pb and to recently measured data at CEBAF on 16O(e, e'p) to investigate the electron Coulomb distortion effects and to extract the structure functions with the new phase shifts.

High-momentum-transfer processes with polarized deuterons

On the basis of the nuclear core hypothesis we predict that cross sections for high-energy (e, e'), (e, e'N), (h, N) inclusive reactions and the cross section for the high-momentum-transfer e+D → { e+ N+ N} reaction off polarized deuterons should strongly depend on the deuteron polarization in the kinematics forbidden for the scattering off a free nucleon. A problem of the polarized neuteron structure function extraction from e D data is analysed. We demonstrate also that the measurement of the D+N → p +X reaction is sufficient to reconstruct the spin-density matrix of a rapid deuteron. On the basis of the perturbative QCD the rule of the minimal change of helicity for leading hadron production in high-energy inclusive hadron processes is suggested.

Lepton pair production: Where the simple Drell-Yan picture breaks down

We point out that over an experimentally important kinematic region lepton pair production arises from the annihilation of a quark and antiquark within the same hadron. This renders incorrect the conventional extraction of structure functions from data in this region. Instead it now becomes possible to obtain information on the correlation between a quark and antiquark within the same proton. We carefully quantify this kinematic region of interest and illustrate it with a discussion of the validity of some recent structure function analyses.