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Author : Paul Moore McKee
Publisher :
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.X/5 (4 download)
Download or read book The Spin Structure Function of the Proton from SLAC Experiment E155 written by Paul Moore McKee and published by . This book was released on 2000 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (684 download)
Download or read book The Spin Structure Function of the Proton from SLAC Experiment E155 written by and published by . This book was released on 2004 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiment E155 at the Stanford Linear Accelerator Center (SLAC) measured the longitudinal and transverse deep inelastic structure functions of the proton and deuteron using a polarized, 48.3 GeV electron beam and solid polarized targets of ammonia (15NH3) for proton measurements and lithium deuteride (6Li2H) for deuteron measurements. Three electromagnetic spectrometers at angles of 2.75{sup o}, 5.5{sup o}, and 10.5{sup o} measured the scattered electrons. This work presents an analysis of the longitudinal structure function of the proton, g1{sup p}(x, Q2). Included is a re-analysis of the proton target polarization data that for the first time corrects a problem encountered which altered those measurements.
Author :
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ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (684 download)
Download or read book Spin Structure Functions of the Proton and Deuteron From SLAC Experiments E155 and E155X. written by and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments E155 and E155X at SLAC were polarized deep inelastic scattering measurements of the parallel and perpendicular scattering asymmetries. We extracted the polarized structure functions g1 and g2 of the proton and deuteron. Both experiments made precision measurements through a wide range in x and Q2. These data fall into the kinematic range between existing world data and have good consistency with them. In combination with the other world data, the results for g1 allow increased constraint on NLO QCD fits to the polarized structure functions. For g2 no significant world data existed before E155X. The E155X measurement provides information about the higher twist effects in the nucleon.
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (683 download)
Download or read book Spin Structure Functions G1 and G2 for the Proton and Deuteron written by and published by . This book was released on 1999 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experiment E155 at SLAC measured the spin structure functions g1 and g2 of the proton and deuteron. The experiment used deep inelastic scattering of 48.3 GeV longitudinally polarized electrons incident on polarized solid 15NH3 and 6LiD targets. The data taken by three independent spectrometers covered a kinematic range of 0.014
Author :
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (684 download)
Download or read book RESULTS AND INTERPRETATIONS OF THE SPIN STRUCTURE EXPERIMENTS AT SLAC. written by and published by . This book was released on 2003 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the recent experiments E154 and E155 at SLAC the spin-dependent structure functions g1(superscript n), g1{sup p}, and g1{sup d} of the neutron, proton, and deuteron were measured by scattering longitudinally polarized 48:3 GeV electrons off longitudinally polarized targets. We report on the measurement of g1(superscript n) by E154, and on the preliminary results on g1° from E155. The SLAC results provide the most precise determination to date of the polarized structure functions. We observe relatively large values of g1(superscript n) at low x that call into question the reliability of data extrapolation to x -> 0. Such divergent behavior disagrees with predictions of the conventional Regge theory, but is qualitatively explained by perturbative QCD. We perform a Next-to-Leading Order perturbative QCD analysis of the world data on the nucleon spin-dependent structure functions. Using the parameterizations of the helicity-dependent parton distributions obtained in the analysis, we evolve the data to Q2 = 5 GeV2, determine the first moments of the polarized structure functions of the proton and neutron, and find agreement with the Bjorken sum rule.
Author : Steven D. Bass
Publisher : World Scientific
ISBN 13 : 9812709487
Total Pages : 212 pages
Book Rating : 4.8/5 (127 download)
Download or read book The Spin Structure of the Proton written by Steven D. Bass and published by World Scientific. This book was released on 2008 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main challenges in nuclear and particle physics in the last 20 years has been to understand how the proton''s spin is built up from its quark and gluon constituents. Quark models generally predict that about 60% of the proton''s spin should be carried by the spin of the quarks inside, whereas high energy scattering experiments have shown that the quark spin contribution is small OCo only about 30%. This result has been the underlying motivation for about 1000 theoretical papers and a global program of dedicated spin experiments at BNL, CERN, DESY and Jefferson Laboratory to map the individual quark and gluon angular momentum contributions to the proton''s spin, which are now yielding exciting results. This book gives an overview of the present status of the field: what is new in the data and what can be expected in the next few years. The emphasis is on the main physical ideas and the interpretation of spin data. The interface between QCD spin physics and the famous axial U(1) problem of QCD (eta and etaprime meson physics) is also highlighted. Sample Chapter(s). Chapter 1: Introduction (159 KB). Contents: Spin Experiments and Data; Dispersion Relations and Spin Sum Rules; g 1 Spin Sum Rules; Fixed Poles; The Axial Anomaly, Gluon topology and g (0) A; Chiral Symmetry and Axial U(1) Dynamics; QCD Inspired Models of the Proton Spin Problem; The Spin-Flavour Structure of the Proton; QCD Fits to g 1 Data; Polarized Quark Distributions; Polarized Glue o g(x, Q 2 ); Transversity; Deeply Virtual Compton Scattering and Exclusive Processes; Polarized Photon Structure Functions; Conclusions and Open Questions: How Does the Proton Spin?. Readership: Academics, as well as physicists working on particle and nuclear physics at the interface of theory and experiment.
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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (871 download)
Download or read book Measurement of the Proton and Deuteron Spin Structure Functions G1 and G2 written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The SLAC experiment E155 was a deep-inelastic scattering experiment that scattered polarized electrons off polarized proton and deuteron targets in the effort to measure precisely the proton and deuteron spin structure functions. The nucleon structure functions g1 and g2 are important quantities that help test our present models of nucleon structure. Such information can help quantify the constituent contributions to the nucleon spin. The structure functions g1{sup p} and G1{sup d} have been measured over the kinematic range 0.01 ≤ x ≤ 0.9 and 1 ≤ Q2 ≤ 40 GeV2 by scattering 48.4 GeV longitudinally polarized electrons off longitudinally polarized protons and deuterons. In addition, the structure functions g2{sup p} and g2{sup d} have been measured over the kinematic range 0.01 ≤ x ≤ 0.7 and 1 ≤ Q2 ≤ 17 GeV2 by scattering 38.8 GeV longitudinally polarized electrons off transversely polarized protons and deuterons. The measurements of g1 confirm the Bjorken sum rule and find the net quark polarization to be [Delta][Sigma] = 0.23 ± 0.04 ± 0.6 while g2 is found to be consistent with the g2{sup WW} model.
Author : Bernard Frois
Publisher : World Scientific
ISBN 13 : 9814545406
Total Pages : 702 pages
Book Rating : 4.8/5 (145 download)
Download or read book The Spin Structure Of The Nucleon written by Bernard Frois and published by World Scientific. This book was released on 1998-02-24 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: From its early beginnings at SLAC in the 1970's, the study of nucleon spin structure using polarized lepton beams and polarized nucleon targets has become increasingly important in nuclear and particle physics, with current experiments at several of the world's high energy and nuclear physics laboratories (CERN, DESY, SLAC and Jefferson Lab) and with enormous related theoretical studies. The understanding of the fascinating but complicated problem of nucleon spin structure has progressed substantially, but fundamental questions remain and it can be confidently predicted that future activity will be high.The Erice Course on The Spin Structure of the Nucleon covered both the experimental and theoretical aspects of the subject, and this volume includes the lectures given at the School. In many cases the lecture material has been extended and updated by the authors. In addition, several recent publications on experimental work have been added in an appendix.
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ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (684 download)
Download or read book Spin Physics Experiments at SLAC. written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results from E155 and E155x on the g1 and g2 spin structure functions of the proton and neutron are presented. Plans for future experiments using polarized photon beams are discussed.
Download or read book Recent SLAC Measurements of the Spin Dependent Structure Functions for the Proton and Neutron written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results from SLAC experiments E142 and E143 for the spin dependent structure functions of the proton g[sub 1][sup p](x, Q[sup 2]) and neutron g[sub 1][sup n](x, Q[sup 2]) measured in deep inelastic scattering of polarized electrons from a polarized target. Experiment E142 measures[integral][sub 0][sup 1] g[sub 1][sup n](x)dx=[minus]0.022[+-] 0.011 atQ[sup 2]= 2 (GeV/c)[sup 2] using a polarized[sup 3]He target. Experiment E143 measures[integral][sub 0][sup 1] g[sub 1][sup p](x)dx= 0.129[+-] 0.011 atQ[sup 2]= 3 (GeV/c)[sup 2] using a polarized NH[sub 3] target. These results are combined at Q[sup 2]= 3 (GeV/c)[sup 2] to yield[integral][sub 0][sup 1][g[sub 1][sup p](x)[minus] g[sub 1][sup n](x)]dx= 0.151[+-] 0.015. The Bjorken sum rule predicts 0.171[+-] 0.008.
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (727 download)
Download or read book Experiments on Nucleon Spin-dependent Structure Functions written by and published by . This book was released on 1991 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this presentation, the earlier measurements of the spin-dependent structure function of the proton in experiments at SLAC and at CERN are reviewed. In addition several new deep inelastic scattering experiments to measure the spin-dependent structure functions of the nucleon, both proton and neutron, will be discussed.
Author : Don G. Crabb
Publisher : World Scientific
ISBN 13 : 9812382739
Total Pages : 338 pages
Book Rating : 4.8/5 (123 download)
Download or read book Testing QCD Through Spin Observables in Nuclear Targets written by Don G. Crabb and published by World Scientific. This book was released on 2003 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the invited talks and contributed papers presented at the workshop on ?Testing QCD Through Spin Observables in Nuclear Targets?, held at the University of Virginia in April 2002.The workshop was proposed in the context of the large number of experiments that have used polarized deuterons or polarized 3He to extract information about the spin parameters of the neutron. The motivation for this workshop was to study the effects of the nuclear medium on the spin properties of the bound nucleon and to explore issues in QCD that might be resolved through spin observables in nuclear targets: What is the effect of the nuclear medium on the measured asymmetries? How have the latest results on the spin structure of the nucleon and the nucleon form factors changed our thinking? What advances are anticipated in the development of polarized targets?
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Author : Tingjun Liu
Publisher :
ISBN 13 :
Total Pages : 362 pages
Book Rating : 4.:/5 (647 download)
Download or read book Measurements of Spin Structure Function G[p]1 and G[d]1 for Proton and Deuteron at SLAC E143 written by Tingjun Liu and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frank R. Wesselmann
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.:/5 (466 download)
Download or read book Precision Measurement of the Spin Structure of the Proton and the Deuteron written by Frank R. Wesselmann and published by . This book was released on 2000 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (467 download)
Download or read book Sala São Paulo written by and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Last Experimental Results Obtained at SLAC on the Nucleon Spin Structure written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent precise measurements of the spin structure function g[sub 1] for proton and for deuteron using deep inelastic scattering of polarized electrons from polarized ammonia targets are presented. The integrals[Gamma][sub 1]=[integral][sub 0][sup 1] g[sub 1](x)dx evaluated at the average experimental Q= 3(GeV/c)[sup 2] are in agreement with previous results and well below the Ellis-Jaffe sumrule prediction, while the Bjoerken sumrule prediction on[Gamma][sub 1][sup p] -[Gamma][sub 1][sup n] is satisfied. The analysis of the results in term of Quark Parton Model implies that the quark carry about a third of the nucleon helicity.
Download or read book Measurement of Spin Structure Function G(1) for Proton and Deuteron in the Resonance Region written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiment E143 at SLAC measured the proton and deuteron spin structure functions g[sub 1][sup p], g[sub 2][sup p], g[sub 1][sup d] and g[sub 2][sup d] using polarized electrons at beam energies of 29, 16, and 9.7 GeV incident on polarized [sup 15]NHY[sub 3] and [sup 15]ND[sub 3] targets. Two spectrometers detected the scattered electrons at the angles 4.5[sup o] and 7.0[sup o], covering a kinematic range of x> 0.03 and 0.3
