Download or read book Virtual Compton Scattering on the Proton Below Pion Threshold written by Paul S. Bourgeois and published by . This book was released on 2005 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compton Scattering from the Proton Below Pion Threshold written by Bruce Everett MacGibbon and published by . This book was released on 1995 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Compton scattering cross section on the proton was measured at laboratory angles of 90$spcirc$ and 135$spcirc$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$spcirc$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, $bar alpha - barbeta$, while the 90$spcirc$ cross section is sensitive to the electric polarizability $bar alpha$. Using the model independent sum rule constraint for $bar alpha$ + $bar beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$bar alpha = (12.5 pm 0.6 pm 0.8 pm 0.6) times 10sp{-4} fmsp3cr bar beta = (1.8 mp 0.6 mp 0.8 mp 0.6) times 10sp{-4} fmsp3$$where the errors shown are statistical, systematic, and model, respectively.
Download or read book Measurement of Virtual Compton Scattering Below Pion Threshold at Invariant Four momentum Transfer Squared Q2 written by Christophe Jutier and published by . This book was released on 2001 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering at Q2 written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Virtual Compton Scattering is studied at the Thomas Jefferson National Accelerator Facility in the energy domain below pion threshold and in the Delta(1232) resonance region. The data analysis is based on the Dispersion Relation (DR) approach. The electric and magnetic Generalized Polarizabilities (GPs) of the proton and the structure functions Pll-Ptt/epsilon and Plt are determined at four-momentum transfer squared Q2=0.92 and 1.76 GeV2. The DR analysis is consistent with the low-energy expansion analysis. The world data set indicates that neither the electric nor magnetic GP follows a simple dipole form.
Download or read book Virtual Compton Scattering written by L. Van Hoorebeke and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Virtual Compton Scattering o013 the proton has been studied at Q 2 -values of 1:0 and 1:9 (GeV=c) 2 in Hall A at the Thomas Je013erson National Accelerator Facility (JLab). Data were taken below and above the pion production threshold as well as in the resonance region. Results obtained below pion threshold at Q 2 = 1:0 (GeV=c) 2 are presented in this paper.
Download or read book Measurement of the Generalized Polarizabilities of the Proton in Virtual Scattering at Q2 written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Virtual Compton Scattering is studied at the Thomas Jefferson National Accelerator Facility at low Center-of-Mass energies, below pion threshold. Following the Low Energy Theorem for the ep --> ep gamma process, we obtain values for the two structure functions Pll-Ptt/epsilon and Plt at four-momentum transfer squared Q2=0.92 and 1.76 GeV2.
Download or read book Virtual Compton Scattering written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Virtual Compton Scattering process off the proton has been studied at Q2-values of 1.0 and 1.9 (GeV/c)2 using the Hall A facilities of JLab. Data were taken below and above the pion production threshold as well as in the resonance region. Preliminary results, especially in relation with the Generalised Polarisabilities, will be presented.
Download or read book The Virtual Compton Scattering at TJNAF written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Virtual Compton Scattering is a powerful tool to probe the internal structure of the proton. A VCS experiment (E93050) was performed in Hall A at JLAB below and above the pion threshold. In the resonance region, cross sections of pion and photon electroproduction have been produced; below the pion threshold, evidence of the effect of the polarisabilities on the cross sections has been proved.
Download or read book Virtual Compton Scattering and Neutral Pion Electro production from the Proton in the Nucleon Resonance Region written by Luminita Todor and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The experiment (E93-050) at Jefferson Lab measured the ep {yields} ep{gamma} and ep {yields} ep{pi}{sup 0} cross sections in the nucleon resonance region, from the threshold to W = 1.9 GeV at Q{sup 2} = 1 GeV{sup 2} for backward emission of the {gamma} or {pi}{sup 0}.
Download or read book Nstar 2001 Proceedings Of The Workshop On The Physics Of Excited Nucleons written by Dieter Drechsel and published by World Scientific. This book was released on 2001-08-28 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of N∗s can provide us with critical insights into the nature of QCD in the confinement domain. The keys to progress in this domain are the identification of its important degrees of freedom and the effective forces between them. The nucleon is the simplest system in which the nonabelian character of QCD is manifest. There are Nc quarks in a baryon because there are Nc colors, and as a consequence Gell-Mann and Zweig were forced to introduce the quarks in order to describe the octet and decuplet baryons.This volume gives a status report on the recent experimental and theoretical results in the field of nucleon resonance physics. A wealth of new high precision data was presented from facilities around the world, such as BES, BNL, ELSA, GRAAL, JLab, MAMI, MIT/Bates, SPring8, and Yerevan. Particular emphasis was laid on polarization degrees of freedom and large acceptance detectors as precision tools for studying small but important transition amplitudes, and the helicity (spin) structure of the nucleon. There were new results describing the nucleon resonance structure on the basis of quantum chromodynamics, either directly in terms of quarks and gluons by means of lattice gauge theory, or in terms of hadrons in the framework of chiral field theories. A status report on duality showed the surprising connections between the physics of the low energy nucleon resonance region and the realm of quark structure functions in deep inelastic scattering. Finally, this volume contains a summary report of the BRAG workshop, devoted to the analysis of baryon resonances.
Download or read book Virtual Compton Scattering and Neutral Pion Electro production from the Proton in the Nucleon Resonance Region written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The experiment (E93-050) at Jefferson Lab measured the ep [yields] ep[gamma] and ep [yields] ep[pi][sup 0] cross sections in the nucleon resonance region, from the threshold to W = 1.9 GeV at Q[sup 2] = 1 GeV[sup 2] for backward emission of the [gamma] or [pi][sup 0].
Download or read book Perspectives In Hadronic Physics Proceedings Of The Second International Conference written by Boffi Sigfrido and published by #N/A. This book was released on 1999-12-29 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses theoretical and experimental activities in the investigation of nucleon and nuclear structure by electromagnetic and hadronic probes at intermediate and high energies. The focus is on laboratory activities, recent progress concerning the structure of hadrons, relativistic many-body approaches, deep inelastic scattering and correlations in nuclei.
Download or read book Gdh 2000 The Gerasimov drell hearn Sum Rule The Nucleon Spin Structure In The Resonance Region written by Dieter Drechsel and published by World Scientific. This book was released on 2001-02-05 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The history of spin in general, and of the nucleon spin structure in particular, has been full of surprises. For the past 25 years deep inelastic lepton scattering has been studied to determine the carriers of the nucleon spin. However, it was realized only recently that a full understanding of the nucleon spin will also require detailed information on the helicity structure in the resonance region, i.e. in the realm of nonperturbative QCD.This volume gives a status report on the spin structure in the nucleon resonance region, focusing on: new experimental results from SLAC and HERMES; a first glance at the JLab experiments to map out the spin structure functions at low and intermediate four-momentum transfers; the pioneering experiment at MAMI (Mainz) to determine the Gerasimov-Drell-Hearn sum rule for real photons; and recent theoretical concepts and investigations to describe the spin structure in the frameworks of higher twist expansion, phenomenological models and chiral perturbation theory.
Download or read book Baryons 95 written by Benjamin F. Gibson and published by World Scientific. This book was released on 1996 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perspectives In Hadronic Physics Proceedings Of The Conference written by Sigfrido Boffi and published by World Scientific. This book was released on 1997-12-16 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electronuclear Physics With Internal Targets And The Blast Detector Proceedings Of The Second Workshop written by Ricardo Alarcon and published by World Scientific. This book was released on 1999-07-06 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Second Workshop on Electronuclear Physics with Internal Targets and the Bates Large Acceptance Spectrometer Toroid (BLAST) took place at the Massachusetts Institute of Technology in May 1998. A total of 75 physicists from 26 institutions located in seven countries participated in a lively meeting focused on the unique and important advantages of polarized gas targets internal to an electron storage ring in the study of hadron structure. This meeting has reaffirmed the contributions that BLAST will make in the area of few-body physics.The BLAST detector is designed to measure the spin-dependent electromagnetic response of light nuclei in the momentum transfer range up to 0.8 (GeV/c)2. It will use the 1 GeV longitudinally polarized beam of the Bates South Hall Ring and polarized internal targets. BLAST is scheduled to be completed in 2001.
Download or read book Proton Compton Scattering and pion production with Polarized Photons written by Hong Zhang and published by . This book was released on 1995 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
