Measurement Of The Nucleon Structure Function F2 In The Nuclear Medium And Evaluation Of Its Moments PDF Download
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Total Pages | : 32 |
Release | : 2010 |
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Download Measurement of the Nucleon Structure Function F2 in the Nuclear Medium and Evaluation of Its Moments Book in PDF, ePub and Kindle
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
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Release | : 2007 |
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Download Experimental Moments of the Nucleon Structure Function F2 Book in PDF, ePub and Kindle
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.
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Total Pages | : 169 |
Release | : 2002 |
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Download Moments of F2 Structure Functions and Multiparton Correlations in Nuclei Book in PDF, ePub and Kindle
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.
Author | : John Gerard McNicholas |
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Total Pages | : 166 |
Release | : 1982 |
Genre | : Deep inelastic collisions |
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Download A Measurement of the Nucleon Structure Function F2 in Deep Inelastic Muon-deuterium Scattering Book in PDF, ePub and Kindle
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Release | : 2005 |
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Download Moments of Nuclear and Nucleon Structure Functions at Low Q^2 and the Momentum Sum Rule Book in PDF, ePub and Kindle
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.
Author | : Robert D. Kennedy |
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Total Pages | : 488 |
Release | : 1992 |
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Download Measurement of the Ratio of the Neutron and Proton Structure Functions F2 in Inelastic Muon Scattering Book in PDF, ePub and Kindle
Author | : Peter B. R. Björkholm |
Publisher | : Coronet Books Incorporated |
Total Pages | : 124 |
Release | : 1995 |
Genre | : Science |
ISBN | : 9789155435707 |
Download Measurement of the Nucleon Structure Functions F2 and R in Deep Inelastic Muon Scattering Book in PDF, ePub and Kindle
Author | : Sigfrido Boffi |
Publisher | : Clarendon Press |
Total Pages | : 522 |
Release | : 1996 |
Genre | : Science |
ISBN | : 9780198517740 |
Download Electromagnetic Response of Atomic Nuclei Book in PDF, ePub and Kindle
This book covers the structure and dynamics of atomic nuclei in terms of nucleons, pions, and quarks, all within a unified treatment of the nuclear response to an electromagnetic probe. The basic formalism is presented to describe the electromagnetic field and its interaction with nuclear matter for both real and virtual photons. Nuclear response is then analyzed in terms of structure functions in the case of inclusive and semi-inclusive inelastic electron scattering. The discussion covers pion production and one- or two-nucleon emission and compares the results with available data. The formalism is also extended to incident polarized electrons, polarized targets and nuclear recoil polarization. It contains a comprehensive description of photonuclear reactions at intermediate energies and a review of experimental data and previous theoretical approaches.
Author | : Peter Daniel Meyers |
Publisher | : |
Total Pages | : 376 |
Release | : 1983 |
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Download Measurement of the Nucleon Structure Function Using High Energy Muons Book in PDF, ePub and Kindle
Author | : Antonio Dobado |
Publisher | : Springer Science & Business Media |
Total Pages | : 615 |
Release | : 2008-11-07 |
Genre | : Science |
ISBN | : 3540725164 |
Download The IVth International Conference on Quarks and Nuclear Physics Book in PDF, ePub and Kindle
The QNP series of international conferences on Quarks and Nuclear Physics is by now a well established and highly respected forum where the most recent developments in the field are discussed and communicated. QNP 2006 is the forth edition of this biennial meeting. Selected and refereed original contributions of QNP 2006 have been published in The European Physical Journal A - Hadrons and Nuclei (EPJ A), while the present proceedings book, in addition to reprinting the articles published in EPJ A, further includes all other contributions selected and accepted by the organizing committee for publication and archiving.