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Download Strangeness Contributions to Nucleon Form Factors Book in PDF, ePub and Kindle
We review a recent theoretical determination of the strange quark content of the electromagnetic form factors of the nucleon. These are compared with a global analysis of current experimental measurements in parity-violating electron scattering.
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Release | : 2007 |
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Download Progress in the Calculation and Experimental Determination of the Strangeness Contributions to Nucleon Form Factors Book in PDF, ePub and Kindle
The progress in lattice QCD, especially the capacity to calculate at ever lower quark masses, combined with modern techniques of chiral extrapolation, means that one can now determine the strange quark contribution to the vector form factors of the nucleon with remarkable precision. We review these recent landmark calculations and compare them with the most recent global analysis of the experimental situation using parity violating electron scattering.
Author | : Phiala Elisabeth Shanahan |
Publisher | : Springer |
Total Pages | : 224 |
Release | : 2016-05-11 |
Genre | : Science |
ISBN | : 3319314386 |
Download Strangeness and Charge Symmetry Violation in Nucleon Structure Book in PDF, ePub and Kindle
This thesis discusses two key topics: strangeness and charge symmetry violation (CSV) in the nucleon. It also provides a pedagogical introduction to chiral effective field theory tailored to the high-precision era of lattice quantum chromodynamics (QCD). Because the nucleon has zero net strangeness, strange observables give tremendous insight into the nature of the vacuum; they can only arise through quantum fluctuations in which strange–antistrange quark pairs are generated. As a result, the precise values of these quantities within QCD are important in physics arenas as diverse as precision tests of QCD, searches for physics beyond the Standard Model, and the interpretation of dark matter direct-detection experiments. Similarly, the precise knowledge of CSV observables has, with increasing experimental precision, become essential to the interpretation of many searches for physics beyond the Standard Model. In this thesis, the numerical lattice gauge theory approach to QCD is combined with the chiral perturbation theory formalism to determine strange and CSV quantities in a diverse range of observables including the octet baryon masses, sigma terms, electromagnetic form factors, and parton distribution functions. This thesis builds a comprehensive and coherent picture of the current status of understanding of strangeness and charge symmetry violation in the nucleon.
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Total Pages | : 82 |
Release | : 2010 |
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Download A Global Analysis of the Strange Vector and Axial Form Factors of the Nucleon and Their Uncertainties Book in PDF, ePub and Kindle
We studied the strange contributions to the elastic vector and axial form factors of the nucleon using all available elastic electroweak scattering data. Specifically, we combine elastic nu-p and nubar-p scattering cross-section data from the Brookhaven E734 experiment with elastic ep and quasi-elastic ed and e-4He scattering parity-violating asymmetry data from the SAMPLE, HAPPEx, PVA4 and G0 experiments. We not only determined these form factors at individual values of momentum-transfer (Q2), as other groups have done recently, but also fit the Q2-dependence of these form factors using simple functional forms. I present an overview of the G0 backward-angle experiment as well as the results of these fits using existing data, along with some expectations of how we can improve our knowledge of these form factors if the MicroBooNE collaboration completes their experiment.
Author | : C. Furget |
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Release | : 2006 |
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Download The G0 Experiment at Jefferson Laboratory Book in PDF, ePub and Kindle
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.
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Release | : 2007 |
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Download Recent Developments Concerning the Role of Strangeness in the Nucleon Book in PDF, ePub and Kindle
The contributions of strange quarks to the electric and magnetic form factors of the nucleon provide unique insights into the nature of nonperturbative QCD. We present recent results on both the theoretical understanding and the experimental determination of the contribution of strangeness to the low momentum form factors.
Author | : Markus Diehl |
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Total Pages | : 22 |
Release | : 2007 |
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Download Form Factors and Other Measures of Strangeness in the Nucleon Book in PDF, ePub and Kindle
Author | : Steven D. Bass |
Publisher | : World Scientific |
Total Pages | : 212 |
Release | : 2008 |
Genre | : Science |
ISBN | : 9812709487 |
Download The Spin Structure of the Proton Book in PDF, ePub and Kindle
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.
Author | : Charlotte Elster |
Publisher | : Springer Science & Business Media |
Total Pages | : 406 |
Release | : 2013-06-29 |
Genre | : Science |
ISBN | : 3662097125 |
Download Refereed and selected contributions from International Conference on Quark Nuclear Physics Book in PDF, ePub and Kindle
This volume contains the refereed and selected contributions from the International Conference on Quark Nuclear Physics (QNP2002), held from 9 to 14 June 2002 in Jülich, Germany.
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Total Pages | : 55203 |
Release | : 2008 |
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Download Strangeness in the Nucleon Book in PDF, ePub and Kindle
We present an introduction to accurate measurements of the weak neutral current in the elastic scattering of longitudinally polarized electrons off hadronic targets, and show how they can provide new and stringent limits on the contribution of strange quarks to the nucleon form factors. Such a contribution is of particular interest for the study of nucleon structure, since strange quarks do not contribute to the valence state and give us a direct insight into the dynamics of quarkâ antiquark fluctuations. We discuss the latest published results of Happex and G0 experiments as well as the perspectives of high precision measurements of parity violating asymmetries.