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Strange Quark Contributions To Parity Violating Asymmetries In The Forward G0 Electron Proton Scattering Experiment
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Book Synopsis Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment by :
Download or read book Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured parity-violating asymmetries in elastic electron-proton scattering over the range of momentum transfers 0.12
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 Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment by :
Download or read book Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron-Proton Scattering by : Kazutaka Nakahara
Download or read book Measurement of the Strange Quark Contribution to Proton Structure Through Parity Violating Electron-Proton Scattering written by Kazutaka Nakahara and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 (G-Zero) forward angle experiment completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF) has measured the parity violating asymmetries in elastic electron-proton scattering over a Q2 range of 0.12
Book Synopsis Parity Violation in Elastic Electron Scattering by :
Download or read book Parity Violation in Elastic Electron Scattering 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 Experiment E04-115 (the G0 backward angle measurement) at Jefferson Lab is to investigate the contributions of strange quarks to the fundamental properties of the nucleon. The experiment measures parity-violating asymmetries in elastic electron scattering off hydrogen and quasielastic electron scattering off deuterium at backward angles at Q2 = 0.631 (GeV/c)2 and Q2 = 0.232 (GeV/c)2. The backward angle measurement represents the second phase of the G0 experiment. The first phase, Experiment E00-006 (the G0 forward angle experiment), measured parity-violating asymmetries in elastic electron scattering off hydrogen at forward angles over a Q2 range of 0.1-1.0 (GeV/c)2. The experiments used a polarized electron beam and unpolarized hydrogen and deuterium liquid targets. From these measurements, along with the electromagnetic form factors, one can extract the contribution of the strange quark to the proton's charge and magnetization distributions. This thesis represents a fi.
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.
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 Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering by :
Download or read book Measurement of the Strange Quark Contribution to Nucleon Structure Through Parity-Violating Electron Scattering written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The G0 backward angle experiment, completed in Hall C of the Thomas Jefferson National Accelerator Facility (TJNAF), measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2 = 0.22 and 0.63 (GeV/c)2. The asymmetries are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of lte 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. This was also the first measurement of the anapole moment effects in the axial-vector current at these four-momentum transfers.
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 Parity Violation in Forward Angle Elastic Electron Proton Scattering by :
Download or read book Parity Violation in Forward Angle Elastic Electron Proton Scattering written by and published by . This book was released on 1999 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: HAPPEX is a new experiment to probe the strange structure of the nucleon with parity violating electron scattering. We describe the physics motivation, provide an experimental overview and report on the results from the first data run. The asymmetry for the elastic scattering of 3.3 GeV electrons off target protons at a scattering angle of 12.5 degrees was measured to a precision of 15% of itself. The contribution from strange quark form factors was found to be zero within the experimental and theoretical uncertainties.
Book Synopsis From Parity Violation to Hadronic Structure and more by : Serge Kox
Download or read book From Parity Violation to Hadronic Structure and more written by Serge Kox and published by Springer Science & Business Media. This book was released on 2007-06-07 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost 50 years after the proposal of Lee and Young in 1956 to test the hypothesis of parity violation in weak interactions and the subsequent experimental verification of parity violation by C. S. Wu, parity violation has today become a useful property of weak interactions. This is due to the fact that the focus nowadays has changed: parity violation in weak interactions is no more a topic of investigation but is used as a tool in many different fields ranging from nuclear physics to the search for the hidden extra dimensions requested by string theory. For our first workshop which took place June 5-8, 2002, at the Institut fiir Ke- physik of the Johannes Gutenberg-Universitat Mainz, we concentrated on the in vestigation of the strangeness contribution in the nucleon. This book contains the refereed and selected papers of the second workshop "From Parity Violation to Hadron Structure and more (Part II)", which took place June 8-11, in the Labo- toire de Physique Subatomique et de Cosmologie, in Grenoble. These papers appear in EPJAdirect, the electronic-only part of EPJA, and they are accessible without restrictions. They will also appear in printed form and can be ordered through Springer. The excellent presentations show the dramatic and steady progress in the accuracy of measured parity violating asymmetries over the last few years.
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.
Book Synopsis Parity Violation In Atoms And In Polarized Electron Scattering by : Marie-anne Bouchiat
Download or read book Parity Violation In Atoms And In Polarized Electron Scattering written by Marie-anne Bouchiat and published by World Scientific. This book was released on 1999-07-13 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years there has been considerable progress in improving the accuracy of parity violation experiments in electron scattering at high energy and in atomic physics. Recent results are a challenge to the standard electroweak theory and our understanding of hadron structure. This book is an extensive review of the advances in this field. The theoretical framework is presented at a pedagogical level, experiments and future projects are reviewed, and the results and their interpretation are discussed in depth.
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 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 Strangeness Content of the Proton from Parity Violating Electron Scattering at JLab by :
Download or read book The Strangeness Content of the Proton from Parity Violating Electron Scattering at JLab written by and published by . This book was released on 1999 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have measured the parity violating asymmetry in the cross section for elastic scattering of longitudinally polarized electrons from protons at 3.36 GeV incident energy and 0.48 GeV2/c2 momentum transfer at JLab. From their 1998 run, this asymmetry is -14.5±2.2 ppm, consistent with the Standard Model with no contribution from strange quarks. They extract the combination of strange form factors G3{sub E} + 0.39G3{sub M}=0.023±0.034(stat)±0.022(syst)±0.026([delta]G{sup +n}{sub E}), where the last error arises from the neutron electric form factor.
Book Synopsis Parity Violating Asymmetries and Weak Neutral Currents by : Thomas Tsao
Download or read book Parity Violating Asymmetries and Weak Neutral Currents written by Thomas Tsao and published by . This book was released on 1980 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
