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Experimental Moments of the Nucleon Structure Function F2

Experimental Moments of the Nucleon Structure Function F2
Author:
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Release: 2007
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ISBN:

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Experimental data on the F2 structure functions of the proton and deuteron, including recent results from CLAS at Jefferson Lab, have been used to construct their n=12 moments. A comprehensive analysis of the moments in terms of the operator product expansion has been performed to separate the moments into leading and higher twist contributions. Particular attention was paid to the issue of nuclear corrections in the deuteron, when extracting the neutron moments from data. The difference between the proton and neutron moments was compared directly with lattice QCD simulations. Combining leading twist moments of the neutron and proton we found the d/u ratio at x-1 approaching 0, although the precision of the data did not allow to exclude the 1/5 value. The higher twist components of the proton and neutron moments suggest that multi-parton correlations are isospin independent.


Moments of F2 Structure Functions and Multiparton Correlations in Nuclei

Moments of F2 Structure Functions and Multiparton Correlations in Nuclei
Author:
Publisher:
Total Pages: 169
Release: 2002
Genre:
ISBN:

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The inclusive inelastic electron scattering o the proton was measured at five different beam energies 1.5, 2.5, 4.0, 4.2 and 4.4 GeV. The data were taken, during February-March 1999, on a liquid hydrogen target with the CLAS detector installed in Hall-B of the Thomas Jefferson National Accelerator Facility (TJNAF). The obtained high statistics and high precision data appear to be in good agreement with previously measured world data and permit to integrate experimental values of F2 over x at fixed Q2 , allowing for the first time the evaluation of its experimental moments at low and moderate values of Q2 . In a combined analysis of CLAS and world data, the Q2-evolution of the experimental moments was explored in the range from 0.3 up to 100 GeV2 . This offered a unique possibility to trace changes of the proton structure function from hard DIS down to the non-perturbative regime through the transition region, which is of particular interest for the TJNAF physics program. The obtained experimental moments allowed to perform a separation between the leading twist, calculable in the framework of the perturbative QCD (pQCD), and higher twists, treated effectively. A comparison with theoretical predictions based either on lattice QCD simulations or obtained within models of the nucleon structure may represent an important test of our understanding of the nucleon structure as observed at large wavelengths.


Moments of Nuclear and Nucleon Structure Functions at Low Q^2 and the Momentum Sum Rule

Moments of Nuclear and Nucleon Structure Functions at Low Q^2 and the Momentum Sum Rule
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Total Pages:
Release: 2005
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ISBN:

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New nuclear structure function data from Jefferson Lab covering the higher x and lower Q2 regime make it possible to extract the higher order F2 moments for iron and deuterium at low four-momentum transfer squared Q2. These moments allow for an experimental investigation of the nuclear momentum sum rule and a direct comparison of the non-singlet nucleon moment with Lattice QCD results.


Particle Physics on the Eve of LHC

Particle Physics on the Eve of LHC
Author: A. I. Studenikin
Publisher: World Scientific
Total Pages: 495
Release: 2009
Genre: Science
ISBN: 9812837582

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This proceedings volume is devoted to a wide variety of items, both in theory and experiment, of particle physics such as tests of the Standard Model and beyond, physics at the future accelerators, neutrino and astroparticle physics, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology. It is important that the papers in this volume reveal the present status and new developments in the above-mentioned items on the eve of a new era that starts with the Large Hadron Collider (LHC).


Particle Physics On The Eve Of Lhc - Proceedings Of The 13th Lomonosov Conference On Elementary Particle Physics

Particle Physics On The Eve Of Lhc - Proceedings Of The 13th Lomonosov Conference On Elementary Particle Physics
Author: Alexander I Studenikin
Publisher: World Scientific
Total Pages: 495
Release: 2009-01-05
Genre: Science
ISBN: 9814469041

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This proceedings volume is devoted to a wide variety of items, both in theory and experiment, of particle physics such as tests of the Standard Model and beyond, physics at the future accelerators, neutrino and astroparticle physics, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology. It is important that the papers in this volume reveal the present status and new developments in the above-mentioned items on the eve of a new era that starts with the Large Hadron Collider (LHC).


Proceedings of the Workshop on Lepton Scattering, Hadrons and QCD

Proceedings of the Workshop on Lepton Scattering, Hadrons and QCD
Author: Wally Melnitchouk
Publisher: World Scientific
Total Pages: 352
Release: 2001
Genre: Science
ISBN: 9789812799708

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This volume is centered on recent developments in the exploration of hadronic structure through lepton scattering, in the description of hadron physics directly from lattice QCD and non-perturbative QCD models, and in efforts to strengthen the links between these activities. Specific topics that are covered include: parton distribution functions, polarized structure functions, generalized structure functions, nuclear effects, quark-hadron duality, electromagnetic form factors, structure functions and hadron properties from lattice QCD, and QCD models based on the DysonOCoSchwinger equations. Contents: Partonic Structure of Hadrons: Chiral Extrapolation of Lattice Structure Function Calculations (W Detmold); Exclusive Processes at HERMES (N Bianchi); Soft Pion Production Associated with Deeply Virtual Compton Scattering (L Mosse); Spin Structure of Hadrons: Polarized Structure Functions in QCD (J Kodaira); Single Spin Asymmetries and Quark Fragmentation (M Anselmino et al.); Perturbative OCo Nonperturbative QCD Transition: Lepton Scattering and Quark-Hadron Duality Studies at Jlab (R Ent); Estimating Low Energy Model Parameters from Deep Inelastic Scattering (L P Hoyt & A I Signal); Form Factors: Physical Hadron Properties from Lattice Data at Large Quark Masses (A W Thomas); Electromagnetic Interactions in Light Front Dynamics (J -F Mathiot); Nucleon Form Factors in the Covariant Diquark-Quark Model (R Alkofer & M Oettel); Hadron Excitations, Confinement and Chiral Symmetry Breaking: Experimental Studies of the Hadron Spectrum (J Napolitano); The Character of Goldstone Bosons (M B Hecht et al.); Deconfining by Winding (R Hofmann); Small- x Physics and Nuclear Medium Effects: Leading Nucleon Production at HERA (G Levman); Nuclear Medium Effects at HERMES (P di Nezza); Physics Motivation for a Polarized Electron-Ion Collider (J M Cameron & J T Londergan); and other papers. Readership: Theoretical and experimental researchers in nuclear and high energy physics."


Measurement of the Nucleon Structure Function F2 in the Nuclear Medium and Evaluation of Its Moments

Measurement of the Nucleon Structure Function F2 in the Nuclear Medium and Evaluation of Its Moments
Author:
Publisher:
Total Pages: 32
Release: 2010
Genre:
ISBN:

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We report on the measurement of inclusive electron scattering off a carbon target performed with CLAS at Jefferson Laboratory. A combination of three different beam energies 1.161, 2.261 and 4.461 GeV allowed us to reach an invariant mass of the final-state hadronic system W H"2.4 GeV with four-momentum transfers Q2 ranging from 0.2 to 5 GeV2. These data, together with previous measurements of the inclusive electron scattering off proton and deuteron, which cover a similar continuous two-dimensional region of Q2 and Bjorken variable x, permit the study of nuclear modifications of the nucleon structure. By using these, as well as other world data, we evaluated the F2 structure function and its moments. Using an OPE-based twist expansion, we studied the Q2-evolution of the moments, obtaining a separation of the leading-twist and the total higher-twist terms. The carbon-to-deuteron ratio of the leading-twist contributions to the F2 moments exhibits the well known EMC effect, compatible with that discovered previously in x-space. The total higher-twist term in the carbon nucleus appears, although with large systematic uncertainites, to be smaller with respect to the deuteron case for n


Frontiers of Particle Physics

Frontiers of Particle Physics
Author: A. I. Studenikin
Publisher: World Scientific
Total Pages: 367
Release: 2003
Genre: Science
ISBN: 9812383190

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Printbegrænsninger: Der kan printes 10 sider ad gangen og max. 40 sider pr. session.


Nucleon Structure at Large Bjorken X

Nucleon Structure at Large Bjorken X
Author: Claude Bourrely
Publisher: American Institute of Physics
Total Pages: 294
Release: 2005-03-03
Genre: Science
ISBN:

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Marseille, France, 26-28 July 2004


EPS - High Energy Physics '89

EPS - High Energy Physics '89
Author: R. Fernandez Alvarez-Estrada
Publisher: Elsevier
Total Pages: 729
Release: 2016-06-03
Genre: Science
ISBN: 1483257290

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EPS - High Energy Physics '89 presents the proceeding of the International Europhysics Conference on High Energy physics, held in Madrid, Spain, on September 6–13, 1989. This book outlines several topics on the interface between cosmology/astrophysics and particle physics. Organized into two parts encompassing 181 chapters, this compilation of papers begins with an overview of the implications of the cosmic light element abundances. This text then examines the various aspects of lattice field theory. Other chapters consider the theoretical evidence of a fundamental length in string theory and outline the main features of the higher order corrections to the heavy quark inclusive cross section. This book discusses as well the theory of heavy quark production in hadron collision. The final chapter deals with the idea of low-energy supersymmetry, which relates the scale of supersymmetry breaking to the origin and stability of the electroweak scale. This book is a valuable resource for astrophysicists, physicists, and scientists.