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The Strange Form Factors Of The Proton And The G0 Experiment
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Book Synopsis The Strange Form Factors of the Proton and the G0 Experiment by : J. W. Martin
Download or read book The Strange Form Factors of the Proton and the G0 Experiment written by J. W. Martin and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of parity violating asymmetries in elastic electron-nucleon scattering can be used to determine the contribution of strange quark-antiquark pairs to the form factors. It is the aim of the G0 experiment at Jefferson Lab to perform the complete separation of the electric and magnetic strange form factors over a broad range of Q2. The G0 forward-angle measurements were completed in 2004 and preliminary results will be presented. The first G0 backward-angle measurements will take place in late 2005. Preparations for those measurements are under way and will be discussed.
Download or read book The G0 Experiment written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In the G^0 experiment, parity violation asymmetries in elastic electron scattering from the nucleon will be measured. The primary purpose of the experiment is to separate the s quark contributions contributions (G^s_E(Q^2)) and (G^s_M(Q^2)) from the overall charge and magnetization densities of the proton. With this aim in view, a dedicated apparatus has been constructed and is currently being installed at JLAB/Hall C.
Book Synopsis The G0 Experiment at Jefferson Laboratory by : C. Furget
Download or read book The G0 Experiment at Jefferson Laboratory written by C. Furget and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G^0 experiment is dedicated to the determination of the strange quark's contribution to the electric and magnetic nucleon form factors, provided by parity-violating asymmetries of cross-sections measured with longitudinaly polarized electrons in elastic electron-proton scattering and quasi-elastic electron-deuteron scattering. Forward angle measurements, which have been performed in Hall C of Jefferson Laboratory, have provided a linear combination of electric and magnetic vector form factors for momentum transfers in the range 0.1 to 1 (GeV/c)^2. Backward angle measurements, which will be performed starting in 2006, will allow the complete separation of the form factors at Q^2 of 0.23 and 0.63 (GeV/c)^2.
Book Synopsis The Spin Structure of the Proton by : Steven D. Bass
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 - 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. Book jacket.
Book Synopsis The G0 Experiment At Jefferson Lab by :
Download or read book The G0 Experiment At Jefferson Lab written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electron-proton parity-violation G0 experiment at Jefferson Lab aims to make a determination of the 'strange' quark currents in the proton. Two new proton ground state matrix elements will be measured which are sensitive to point-like 'strange' quarks and hence to the quark-antiquark sea in the proton. The matrix elements of interest are the elastic-scattering vector weak neutral-current 'charge' and 'magnetic' form factors, GZE and GZM, respectively. By measuring the very small parity-violating asymmetries in elastic electron-proton scattering at momentum transfers between 0.1 and 1.0 GeV2, and combining these asymmetries with previously measured electromagnetic form factors, new information about the proton weak form factors can be obtained. This new high precision experiment is presently in the installation and commissioning phase.
Book Synopsis G0 Experiment Status by : G. Batigne
Download or read book G0 Experiment Status written by G. Batigne and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 project is a parity violation experiment dedicated to the measurement of the proton weak and axial form factors by means of elastic electron scattering. Combining these weak form factors with the known electromagnetic ones makes possible the extraction of the contribution of strange quarks to the charge and magnetization distributions in the nucleon. After introducing the physics case, this paper describes the G0 apparatus and the measurements planned. An engineering run of this experiment took place recently ; first results are presented.
Book Synopsis Asymmetries Analysis from the Forward Angle Part of the G0 Experiment by : Julie Roche
Download or read book Asymmetries Analysis from the Forward Angle Part of the G0 Experiment written by Julie Roche and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The possible role of the strange quarks in the spin structure of the nucleon has spawned a great deal of interest in the study of the contribution of strange quarks to the electromagnetic (EM) structure of the nucleon. Weak neutral form factors arising from the Z{sup 0} coupling of the electron to the proton, in addition to the usual electromagnetic form factors, give access to G{sub E}{sup s} and G{sub M}{sup s}: contributions of the strange quarks to the nucleon EM form factors. Various collaborations (SAMPLE at Bates, HAPPEX and G0 at Jefferson Lab, PVA4 at MAMI) have performed parity-violating electron scattering experiments in order to measure the strange quark form factors. In these high luminosity experiments, longitudinally-polarized electron beams are scattered off unpolarized targets of protons or deuterons; the resulting asymmetry in cross sections measured between the two beam helicity states is a simple function of G{sub E}{sup s} and G{sub M}{sup s}. Measurements at different angles and/or on different targets are necessary to separate the electric and magnetic strange quark form factors. The G0 collaboration has built a dedicated large acceptance apparatus which allows measurements of the asymmetry both at forward and backward angles off LH2 and LD2. As a result, the collaboration will be able to separately extract G{sub E}{sup s} and G{sub M}{sup s} over a range of four momentum transfer Q{sup 2} from 0.3 to 0.8 (GeV/c){sup 2} when the entire experimental program in Hall C at Jefferson Lab is completed. The first phase of the experiment (forward angle configuration) which is sensitive to linear combinations of the two strange quark form factors over the whole range of Q{sup 2}, was completed in May 2004; progress on the analysis set will be reported.
Download or read book Baryons 2002 written by Carl Carlson and published by World Scientific. This book was released on 2003 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the latest developments in the area of three-quark systems. Emphasis is given to the discussion of new experimental results in the areas of form factors, unpolarized and polarized structure functions, and baryon structure and spectroscopy. Of particular interest are the new theoretical developments in the area of generalized parton distributions and lattice quantum chromodynamics.
Book Synopsis Chiral Dynamics: Theory And Experiment Iii by : Aron M Bernstein
Download or read book Chiral Dynamics: Theory And Experiment Iii written by Aron M Bernstein and published by World Scientific. This book was released on 2001-12-04 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an authoritative, up to date, overview of the field of chiral dynamics, and also provides an excellent introduction to the field. The workshop is known for the interplay of theory and experiment and as a meeting place for most of the leading researchers in the field.
Book Synopsis Mesure Du Contenu E'strange Du Nucleon by :
Download or read book Mesure Du Contenu E'strange Du Nucleon written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 project is a parity violation experiment dedicated to the measurement of the proton weak and axial form factors by means of electron-proton scattering. Combining these weak form factors with the electromagnetic ones makes possible the extraction of the contribution of strange quarks to the charge and magnetization distribution in the nucleon. This thesis presents the strategy used for the G0 experiment, the different subsystems and the first results from its engineering run. The counting rate asymmetries, at the order of 10-5, are measured over a large range in transferred momentum (Q2 =0.1 to 1 (GeV/c)2) with expected precision at the level of 10-7. A deadtime correction program has been developed which allows to correct 90% of the counting losses and to reduce associated false asymmetries at the level of 10-8. A method has been defined to extract the measured values of Q2 with a precision of 1%. The first preliminary results of G0 on parity violation asymmetries are also shown.
Book Synopsis New Precision Limit on the Strange Vector Form Factors of the Proton by :
Download or read book New Precision Limit on the Strange Vector Form Factors of the Proton written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV2 and beam energy Eb = 3.48 GeV to be APV = -23.80 " 0.78 (stat) " 0.36 (syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors GEs + 0.517 GMs = 0.003 " 0.010 (stat) " 0.004 (syst) " 0.009 (ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.
Book Synopsis Results from the Forward G0 Experiment by :
Download or read book Results from the Forward G0 Experiment written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 experiment is dedicated to the determination of the strange quark contribution to the electric and magnetic nucleon form factors for a large range of momentum transfers between 0.1 to 1(GeV/c)2 . This information is provided by the asymmetries of cross-sections measured with longitudinally polarized electrons in elastic electron-proton scattering and quasi-elastic electron-deuteron scattering. A set of measurements at two different Q2 will allow the complete separation of the electric and magnetic weak, as well as axial nucleon form factors. This report summarizes the physics case, gives details about the dedicated set-up used, and shows the results of the combination of the strange quark contribution in the electric and magnetic form factors of the protons. The experiment was performed at the Jefferson Laboratory, during years 2003 and 2004, and will be completed after backward-angle measurements in 2006, 2007.
Book Synopsis Strange Quark Contributions to Nucleon Electric and Magnetic Form Factors from Parity-violating Electron Scattering Asymmetries in the Backward Angle G0 Experiment by : Mathew O. Muether
Download or read book Strange Quark Contributions to Nucleon Electric and Magnetic Form Factors from Parity-violating Electron Scattering Asymmetries in the Backward Angle G0 Experiment written by Mathew O. Muether and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 collaboration has measured parity-violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at Q^2 = 0.22, 0.63 GeV^2. These asymmetries are sensitive to strange quark contributions to electric and magnetic properties of the nucleon, as well as to the axial current of the nucleon. The measurements were made using the polarized beam at Jefferson Laboratory by detecting electrons scattered at ~110 degrees from liquid targets. Together with previous results from the G0 forward angle measurement, the form factors which characterize the strange electric, strange magnetic and axial contributions were found to be G^{s}_{E}(0.221 GeV^2)= -0.0142305 +/- 0.035562 +/- 0.0181952 +/-0.0176497 G^{s}_{M}(0.221 GeV^2)=0.0833777 +/- 0.18337 +/- 0.0854892 +/- 0.0780912 G^{e}_{A}(0.221 GeV^2)=-0.501236 +/- 0.317127 +/- 0.193005 +/- 0.0878386 G^{s}_{E}(0.628 GeV^2)=0.110227 +/-0.0488068 +/- 0.0296044 +/- 0.0236998 G^{s}_{M}(0.628 GeV^2)=-0.12354 +/- 0.10953 +/- 0.0614285 +/- 0.0316972 G^{e}_{A}(0.628 GeV^2)=-0.197329 +/- 0.425414 +/- 0.256755 +/- 0.0948741 with statistical, point-to-point systematic and global systematic uncertainties given respectively. These results indicate small (
Book Synopsis Measurement of the Strange Quark Contribution to the Vector Structure of the Proton by :
Download or read book Measurement of the Strange Quark Contribution to the Vector Structure of the Proton written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the G0 experiment is to determine the contribution of the strange quarks in the quark-antiquark sea to the structure of the nucleon. To this end, the experiment measured parityviolating asymmetries from elastic electron-proton scattering from 0.12 ≤ Q2 ≤ 1.0 (GeV/c)2 at Thomas Jefferson National Accelerator Facility. These asymmetries come from the interference of the electromagnetic and neutral weak interactions, and are sensitive to the strange quark contributions in the proton. The results from the forward-angle measurement, the linear combination of the strange electric and magnetic form factors GsE +[eta]GsM, suggest possible non-zero, Q2 dependent, strange quark contributions and provide new information to understand the magnitude of the contributions. This dissertation presents the analysis and results of the forward-angle measurement. In addition, the G0 experiment measured the beam-normal single-spin asymmetry in the elastic scattering of transversely polarized 3 GeV electrons from unpolarized protons at Q2 = 0.15, 0.25 (GeV/c)2 as part of the forward-angle measurement. The transverse asymmetry provides a direct probe of the imaginary component of the two-photon exchange amplitude, the complete description of which is important in the interpretation of data from precision electron-scattering experiments. The results of the measurement indicate that calculations using solely the elastic nucleon intermediate state are insufficient and generally agree with calculations that include significant inelastic hadronic intermediate state contributions. This dissertation presents the analysis and results of this measurement.
Book Synopsis From Parity Violation to Hadronic Structure and more by : K. de Jager
Download or read book From Parity Violation to Hadronic Structure and more written by K. de Jager and published by Springer Science & Business Media. This book was released on 2008-06-21 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the third international workshop on From Parity Violation to Hadronic Structure and More. The many applications of parity violation are way beyond the scope of what Lee and Yang could have imagined fifty years after their proposal. For the physics topics discussed during this workshop, the application of parity violation has become a standard work horse allowing for the extraction of many physics topics in different experiments.
Book Synopsis A Measurement of the Strange Quark Contributions to the Electromagnetic Form Factors of the Nucleon by :
Download or read book A Measurement of the Strange Quark Contributions to the Electromagnetic Form Factors of the Nucleon written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: G0 is a parity violating electron scattering program at the Thomas Jefferson National Accelerator Facility, and its forward angle measurement is reported in this thesis. In this experiment, parity violating asymmetries of elastic electron-proton scattering were measured over a range of four-momentum transfer from 0.12 to 1.0 (GeV/c)2. From the asymmetries, linear combinations of the strange electric and magnetic form factors of the nucleon, G$s\atop{E}$ + [eta]G$s\atop{M}$, are extracted over the same kinematic range. These results, combined with existing data from other experiments, indicate that both G$s\atop{E}$ and [eta]G$s\atop{M}$ are non-zero and dependent on the four-momentum transfer, with imply non-trivial strange quark contributions to the low energy electromagnetic properties of the nucleon.
Book Synopsis Symmetries And Fundamental Interactions In Nuclei by : Wick C Haxton
Download or read book Symmetries And Fundamental Interactions In Nuclei written by Wick C Haxton and published by World Scientific. This book was released on 1995-10-18 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shows the usefulness of the nucleus as a laboratory for learning about basic symmetries and fundamental interactions. It is aimed at advanced graduate students and beginning researchers, but should be useful to advanced researchers as well. Nuclear and particle physicists will find it particularly useful.
