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New Precision Limit On The Strange Vector Form Factors Of The Proton
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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 Hadron Structure in Electroweak Precision Measurements by : Nathan L. Hall
Download or read book Hadron Structure in Electroweak Precision Measurements written by Nathan L. Hall and published by Springer. This book was released on 2015-07-24 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis examines the γZ box contribution to the weak charge of the proton. Here, by combining recent parity-violating electron-deuteron scattering data with our current understanding of parton distribution functions, the author shows that one can limit this model dependence. The resulting construction is a robust model of the γγ and γZ structure functions that can also be used to study a variety of low-energy phenomena. Two such cases are discussed in this work, namely, the nucleon’s electromagnetic polarizabilities and quark-hadron duality. By using phenomenological information to constrain the input structure functions, this important but previously poorly understood radiative correction is determined at the kinematics of the parity-violating experiment, QWEAK, to a degree of precision more than twice that of the previous best estimate. A detailed investigation into available parametrizations of the electromagnetic and interference cross-sections indicates that earlier analyses suffered from the inability to correctly quantify their model dependence.
Book Synopsis A Precision Measurement of the Proton Strange-quark Form Factors at Q2 by : Megan Lynn Friend
Download or read book A Precision Measurement of the Proton Strange-quark Form Factors at Q2 written by Megan Lynn Friend and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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.
Book Synopsis Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~ 0.1GeV^2 by :
Download or read book Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~ 0.1GeV^2 written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report new measurements of the parity-violating asymmetry A{sub PV} in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with ([theta]{sub lab}) H"6.0{sup o}. The 4He result is A{sub PV} = (+6.40 ± 0.23 (stat) ± 0.12 (syst)) x 10−6. The hydrogen result is A{sub PV} = ( -1.58 ± 0.12 (stat) ± 0.04 (syst)) x 10−6. These results significantly improve constraints on the electric and magnetic strange form factors G{sub E}{sup s} and G{sub M}{sup s}. We extract G{sub E}{sup s} = 0.002 ± 0.014 ± 0.007 at (Q2) = 0.077 GeV2, and G{sub E}{sup s} + 0.09 G{sub M}{sup s} = 0.007 ± 0.011 ± 0.006 at (Q2) = 0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976-06 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strange Quark Contribution to the Proton Spin, from Elastic $\vecep$ and $\nu P$ Scattering by : Stephen Pate
Download or read book Strange Quark Contribution to the Proton Spin, from Elastic $\vecep$ and $\nu P$ Scattering written by Stephen Pate and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The strangeness contribution to the vector and axial form factors of the proton is presented for momentum transfers in the range 0.45
Book Synopsis Measuring the Strangeness Radius of the Proton by :
Download or read book Measuring the Strangeness Radius of the Proton written by and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parity violation in elastic ep scattering determines the elastic weak neutral current form factors G^Z(sub)E(q^2) and G^Z(sub)M(q^2) which are directly analogous to the familiar electromagnetic elastic form factors. By using the Standard Model of electroweak interactions and invoking strong isospin for the nucleon, the weak neutral current form factors may be expressed in terms of their electromagnetic counterparts and the strange quark vector form factors G^(S)(sub)E(q^2) and G^(S)(sub)M(q^2). Previous authors have argued that it is feasible to measure G^(S)(sub)E(q^2=0) in this way. In this paper, we show one may also measure G^(S)(sub)E(q^2) at finite q^2 in a separate experiment. Within certain models, it should be possible to extract the.
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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Letters written by and published by . This book was released on 1998 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cooler Rings And Their Applications - Proceedings Of The 19th Ins Symposium by : T Katayama
Download or read book Cooler Rings And Their Applications - Proceedings Of The 19th Ins Symposium written by T Katayama and published by World Scientific. This book was released on 1991-08-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents:Status Report:The IUCF Cooler after Three Years (R E Pollock)The Heidelberg Heavy Ion Cooler Ring TSR (E Jaeschke)Storage and Cooling of Heavy Ions in the ESR up to 200 MeV/u (H Eickhoff et al)Present Status of CELSIUS (A Johansson & D Reistad); Cooler Synchrotron TARN II, Present and Future (T Katayama)Beam Cooling: Electron Cooling at TARN II (T Tanabe et al)Ion Trap: Penning Trap Experiments at the University of Washington and at NIST in Boulder (F L Moore) Electron Cooling and Trapped Antiprotons (H Kalinowsky)Nuclear and Particle Physics: High-Resolution Spectroscopy of Deeply-Bound Pionic Atoms in Heavy Nuclei by Pion-Transfer Reactions of Inverse Kinematics Using the GSI Cooler Ring ESR (T Yamazaki)Nuclear Physics with the Indiana Cooler (H O Meyer)The Anomalous Magnetic Moment of the Muon (V W Hughes)Particle Physics at CELSIUS (S Kullander et al)Accelerator: Advanced Stacking Methods Using Electron Cooling at the TSR Heidelberg (M Grieser et al)Accumulation of Radioactive Beam and Collision with Electron Beam in TARN II (A Ando & T Katayama)Internal Target: Internal Targets at the CELSIUS Storage Ring (C Ekström)A Thin Foil as an Internal Target for a Cooler Ring Experiment (K Noda et al)Atomic Physics: Radiative and Dielectronic Recombination: Measurements at UNILAC and ESR (A Müller et al)Electron-Ion Recombination Measurements with an Electron Cooler (L H Andersen)and other papers Readership: Atomic, nuclear and high energy physicists. keywords:
Download or read book High Energy Physics Index written by and published by . This book was released on 1987 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Baryons As Skyrme Solitons - Proceedings Of The International Workshop by : G Holzwarth
Download or read book Baryons As Skyrme Solitons - Proceedings Of The International Workshop written by G Holzwarth and published by World Scientific. This book was released on 1993-07-15 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revival of the Skyrme model for baryons has led to a large variety of investigations ranging from the foundations of effective meson theories and chiral soliton models, over numerous extensions of Skyrme's original concept, to many impressive results in applications to the meson-baryon system. Each author has made essential contributions to the field of his expertise, and the lectures collected in this proceedings review and asses the present status of these achievements and serve as guiding lines for future developments.
Book Synopsis Particle Physics: The Factory Era - Proceedings Of The Sixth Lake Louise Winter Institute by : Faqir C Khanna
Download or read book Particle Physics: The Factory Era - Proceedings Of The Sixth Lake Louise Winter Institute written by Faqir C Khanna and published by World Scientific. This book was released on 1991-10-09 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of proceedings comprises pedagogical lectures given by invited speakers and is intended for senior graduate students. The emphasis is on Heavy Quark Physics and Physics at the future Kaon, Tau-charm, Phi, and B-factories.
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1992 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
