Spin Effects Qcd And Jefferson Laboratory With 12 Gev Electrons PDF Download
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| Release | : 2013 |
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Download SPIN Effects, QCD, and Jefferson Laboratory with 12 GeV Electrons Book in PDF, ePub and Kindle
QCD and Spin physics are playing important role in our understanding of hadron structure. I will give a short overview of origin of hadron structure in QCD and highlight modern understanding of the subject. Jefferson Laboratory is undergoing an upgrade that will increase the energy of electron beam up to 12 GeV. JLab is one of the leading facilities in nuclear physics studies and once operational in 2015 JLab 12 will be crucial for future of nuclear physics. I will briefly discuss future studies in four experimental halls of Jefferson Lab.
| Author | : Nilanga Liyanage |
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| Release | : 2003 |
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Download Jefferson Lab 12 GeV Spin Program Book in PDF, ePub and Kindle
Spin structure functions provide basic information about the spin of the quark distributions inside the nucleon. Experimental understanding of the nucleon spin in the kinematic region where the three basic ("valence") quarks dominate the nucleon wave function is still rather poor. Jefferson lab, with its high quality, high polarization continuous electron beam and state of the art polarized nucleon targets in each of its three experimental halls is ideally suited for spin structure measurements in the valence region. An experimental program is underway at Jefferson Lab to measure the spin structure of the nucleon in the valence region with unprecedented precision. The planed upgrade of Jefferson lab CEBAF accelerator to 12 GeV will significantly increase the accessible kinematic range and the precision of these measurements.
| Author | : J E J Oberski |
| Publisher | : World Scientific |
| Total Pages | : 906 |
| Release | : 1997-04-15 |
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| ISBN | : 9814546437 |
Download Spin 96 - Proceedings Of The 12th International Symposium On High-energy Spin Physics Book in PDF, ePub and Kindle
Experiments using highly polarized intense beams and targets, and theoretical studies of spin and polarization phenomena, are now providing us with numerous additional details of the electroweak and strong interactions and the structure of matter. The spin structure of the nucleon has been measured over wide ranges of kinematic variables, and the cross sections have been calculated to several orders in perturbative field theory. At present, the influence of the higher twist contributions, the gluon spin, and the quark orbital angular momentum are under scrutiny. Quantum chromodynamics (QCD) captures a lot of our experimental knowledge of hard polarized scattering processes. Can our understanding of such processes within QCD be further improved?Hyperons produced in high energy reactions show how puzzling strong interactions between hadrons still are. Spin observables in experiments at intermediate energy are used to test parity and charge symmetries. Will they also reveal, at low energy, a violation of time reversal symmetry? We are on the verge of using parity violation measurements at intermediate electron scattering energies to determine the amount of strange quark contributions to the neutral weak form factor of the nucleon. The polarization of the sea quarks is expected to be measured soon in W± decays produced in high energy polarized proton interactions. Will the jets in polarized Z⁰ decays show a definite handedness? These and many other topics are discussed in these proceedings.
| Author | : Xiaodong Jiang |
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| Release | : 2003 |
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Download Spin Physics in Deep-Inelastic Semi-Inclusive Reactions with an 11-GeV Electron Beam at Hall A of Jefferson Laboratory Book in PDF, ePub and Kindle
We outline the physics opportunities of semi-inclusive deep inelastic measurements with a polarized NH3 and a polarized 3He target in Jefferson Lab Hall A after the planned 12 GeV CEBAF machine upgrade. In this paper, we estimate statistical uncertainties associated with double-spin and single-spin asymmetries in (e, e'pi) type measurements.
| Author | : Jian-Ping Chen |
| Publisher | : AIP Conference Proceedings (Nu |
| Total Pages | : 196 |
| Release | : 2009-08-04 |
| Genre | : Science |
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Download Spin Structure at Long Distance Book in PDF, ePub and Kindle
Theoretical developments -- Experimental developments -- Future experiments and active analyses.
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| Release | : 2005 |
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Download Jefferson Lab's Results on the Q2-evolution of Moments of Spin Structure Functions Book in PDF, ePub and Kindle
We present the recent JLab measurements on moments of spin structure functions at intermediate and low Q2. The Bjorken sum and Burkhardt-Cottingham sum on the neutron are presented. The later appears to hold. Higher moments (generalized spin polarizabilities and d2(superscript n)) are shown and compared to chiral perturbation theory and lattice QCD respectively.
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| Release | : 2007 |
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Download Spin Physics With Clas At Jefferson Laboratory Book in PDF, ePub and Kindle
Inelastic scattering using polarized nucleon targets and polarized charged lepton beams allows the extraction of spin structure functions that provide information about the spin structure of the nucleon. A program designed to study such processes at low and intermediate Q2 for the proton and deuteron has been pursued by the CLAS Collaboration at Jefferson Lab since 1998. The data with high statistical precision and extensive kinematic coverage allows us to better constrain the polarized parton distributions and to accurately determine various moments of g1 as a function of Q2. The latest results are presented, illustrating our contribution to the world data, with comparisons of the data with NLO global fits, phenomenological models, chiral perturbation theory, the GDH and Bjorken sum rules, and tests of global duality.
| Author | : Peter Bosted |
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| Release | : 2004 |
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Download A Planned Jefferson Lab Experiment on Spin-Flavor Decomposition Book in PDF, ePub and Kindle
Experiment E04-113 at Jefferson Lab Hall C plans to measure the beam-target double-spin asymmetries in semi-inclusive deep-inelastic {rvec p}(e, e{prime}h)X and {rvec d}(e, e{prime}h)X reactions (h = {pi}{sup +}, {pi}{sup -}, K{sup +} or K{sup -}) with a 6 GeV polarized electron beam and longitudinally polarized NH{sub 3} and LiD targets. The high statistic data will allow a spin-flavor decomposition in the region of x = 0.12 {approx} 0.41 at Q{sup 2} = 1.21 {approx} 3.14 GeV{sup 2}. Especially, leading-order and next-to-leading order spin-flavor decomposition of {Delta}u{sub v}, {delta}d{sub v} and {delta}{bar u} - {Delta}{bar d} will be extracted based on the measurement of the combined asymmetries A{sub 1N}{sup {pi}{sup +}-{pi}{sup -}}. The possible flavor asymmetry of the polarized sea will be addressed in this experiment.
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| Release | : 2014 |
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Download Study of Double Spin Asymmetries in Inclusive Ep Scattering at Jefferson Lab Book in PDF, ePub and Kindle
The spin structure of the proton has been investigated in the high Bjorken x and low momentum transfer Q^2 region. We used Jefferson Lab's polarized electron beam, a polarized target, and a spectrometer to get both the parallel and perpendicular spin asymmetries Apar and Aperp. These asymmetries produced the physics asymmetries A_1 and A_2 and spin structure functions g_1 and g_2. We found Q^2 dependences of the asymmetries at resonance region and higher-twist effects. Our result increases the available data on the proton spin structure, especially at resonance region with low Q^2. Moreover, A_2 and g_2 data show clear Q^2 evolution, comparing with RSS and SANE-BETA. Negative resonance in A_2 data needs to be examined by theory. It can be an indication of very negative transverse-longitudinal interference contribution at W ~ 1.3 GeV. Higher twist effect appears at the low Q^2 of 1.9 GeV^2, although it is less significant than lower Q^2 data of RSS. Twist03 matrix element d_2 was calculated using our asymmetry fits evaluation at Q^2 - 1.9 GeV^2. D-bar_2 = -0.0087"0.0014 was obtained by integrating 0.47 d"x d"0.87.
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| Release | : 2002 |
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Download Hadron Spin Dynamics Book in PDF, ePub and Kindle
Spin effects in exclusive and inclusive reactions provide an essential new dimension for testing QCD and unraveling hadron structure. Remarkable new experiments from SLAC, HERMES (DESY), and Jefferson Lab present many challenges to theory, including measurements at HERMES and SMC of the single spin asymmetries in ep[yields] e[prime][pi]X where the proton is polarized normal to the scattering plane. This type of single spin asymmetry may be due to the effects of rescattering of the outgoing quark on the spectators of the target proton, an effect usually neglected in conventional QCD analyses. Many aspects of spin, such as single-spin asymmetries and baryon magnetic moments are sensitive to the dynamics of hadrons at the amplitude level, rather than probability distributions. I will illustrate the novel features of spin dynamics for relativistic systems by examining the explicit form of the light-front wavefunctions for the two-particle Fock state of the electron in QED, thus connecting the Schwinger anomalous magnetic moment to the spin and orbital momentum carried by its Fock state constituents and providing a transparent basis for understanding the structure of relativistic composite systems and their matrix elements in hadronic physics. I also present a survey of outstanding spin puzzles in QCD, particularly A[sub NN] in elastic pp scattering, the J/[psi][yields][rho][pi] puzzle, and J/[psi] polarization at the Tevatron.
