Electron scattering, form factors, vector mesons

by A. Minten

Publisher: European Organization for Nuclear Research in Geneva

Written in English
Published: Pages: 60 Downloads: 611
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Subjects:

  • Scattering (Physics),
  • Vector mesons.,
  • Form factor (Nuclear physics)

Edition Notes

Statement[by] A. Minten.
SeriesCERN, 69-22, CERN (Series) ;, 69-22.
Classifications
LC ClassificationsQC770 .E82 1969, no. 22
The Physical Object
Paginationiii, 60 p.
Number of Pages60
ID Numbers
Open LibraryOL5730795M
LC Control Number70518027

use in electron scattering form factors calculations. The radial wave functions for the single-particle matrix elements have been calculated with the harmonic oscillator (HO) potential. The effect of core-polarization is found essential for the transition strengths (B(C2)) and the q-dependent form factors, and improves the agreement with.   For the parity-violating electron–proton scattering, the interest is on how the two-boson exchange (TBE), γ Z-exchange in particular, could affect the extraction of the long-sought strangeness form factors. Various calculations all indicate that the magnitudes of effect of TBE on the extraction of strangeness form factors is small, though. proton form factors via electron scattering. The two form factors are called F1, → 0.” This is a definition and meaningless. Sakurai’s book [6] shows that the form factors could be reproduced by the claimed static distribu-tions, in terms of VMD, vector meson dominance. The isoscalar and isovector mesons were predicted [11] by. SLAC-PUB Novem QCD Constituent Counting Rules for Neutral Vector Mesons Stanley J. Brodsky,1 Richard F. Lebed,2 and Valery E. Lyubovitskij3,4,5,6 1SLAC National Accelerator Laboratory, Stanford University, Stanford, CA , USA.

Elastic electron-deuteron scattering Tensor Polarization in Elastic electron-deuteron scattering e’-Why poalrziatoin? - Experimental techniques (t 20 vs T 20)-Resutls and separation of form factors-Frist measurement of i T 11 (e) - Physical interpretation (not a review!) - One interesting finding: the deuteron and χET-Conclusion. agreement with eD elastic scattering as well as a large body of other low energy data. The deuteron structure function A(q2) determined by forward electron scattering is dominated b the charge and quadrupole distributions. For the spin-one deuteron, Gros 2 . The electron-nucleon scattering form factor experiments performed by Hofstadter in the s [1] at low momentum transfer were successfully analyzed in the framework of Rosenbluth theory [2], which uses the one-photon-exchange approximation. In Akhiezer [3] and collaborators suggested that at Q2 higher than a few GeV2, a polarized. in electron–deuteron scattering, in neutrino–electron scattering, 49 in neutrino–nucleon scattering, Salam–Weinberg–Glashow model, et seq. neutral K mesons, see K0 mesons neutral pion colour factor in decay, lifetime, parity, 68 spin, 67 neutrino atmospheric, et seq. decoupling in early universe,

Stack Exchange network consists of Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share . is proportional to a photon propagator times form factors which depend only on the structure of the deuteron. In the case of electron-proton scattering this assumption has been tested by searching for effects that would arise from a two- internal vector mesons) which could cause the usual form factors . vector mesons interacting with the electromagnetic field. Although there exists no spin-one analog of the electron, nevertheless just as the proton interacting with the electro­ magnetic field can be treated as a Dirac particle plus form factors to take care of the strongly interacting pieces, it.   Status and plans for neutral weak form factors measurements.- Scalar mesons and the search for the 0++ glueball.- Nucleon deformation: A status report.- CP violation in B-meson decays.- Relativistic study of nucleon electroweak properties in a constituent-quark model.- Parity-violating electron scattering at MAMI: Strangeness in the nucleon

Electron scattering, form factors, vector mesons by A. Minten Download PDF EPUB FB2

Electron scattering occurs when electrons are deviated from their original is due to the electrostatic forces within matter interaction or, if an external magnetic field is present, the electron may be deflected by the Lorentz force.

[citation needed] This scattering typically happens with solids such as metals, semiconductors and insulators; and is a limiting factor in Electric Charge: −1 e, −(35)×10−19. 2 Form Factors from Scattering Experiments Form Factors are an intuitive and simple tool used to describe the scattering vector mesons book from extended targets.

Here we will show how the Form Factor comes about in the context of the scattering of spinless electrons. A discussion of the more rig-File Size: KB. We calculate the stress tensor, or energy-momentum tensor, form factors of the pion and of axial vector mesons in the chiral limit of a hard wall AdS/CFT form factors of QCD.

VMD PHENOMENOLOGY AT WORK: PION FORM FACTOR A well-known demonstration of the degree to which VMD works is the pion form factor F~(q2). It is measured to high accuracy in the spacelike region q2 electron scattering experiments [3] and in the timelike region q2 > 0 by e+e - --* 7r+Tr.

The. The infinite sums over vector meson states appearing in the mathematical description of form factors were approximated by including the first 60 (!) vector mesons states in the numerical computations. The theory of unstable mesons is discussed and formulas are then derived for the emission and propagation of these mesons.

The connection with electromagnetic form factors is then given, particularly for the simple case of infinite bare mass. The results are very similar to. Pion and kaon form factors and heavy vector mesons☆.

Author links open overlay panel N. Zovko ∗. Show more. Electron-Nucleus Scattering XIII, June, Marciana Marina, Isola d’Elba published in PRD89, () and PRD89, form factors Alfred Stadler, University of Évora The Pion Form Factor in the Covariant Spectator Theory Elba XIII, The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic Q2 behavior of perturbative QCD.

Specifically, the vector dominance model (GKex). In physics, the atomic form factor, or atomic scattering factor, is a measure of the scattering amplitude of a wave by an isolated atom.

The atomic form factor depends on the type of scattering, which in turn depends on the nature of the incident radiation, typically X-ray, electron or common feature of all form factors is that they involve a Fourier transform of a spatial density.

elastic electron scattering. In this article we focus on the first four, the electric and magnetic form factors of the proton and the neutron. Clearly having a detailed understanding of all of the form factors of the nucleon constitutes a major goal in physics. These are central to our understanding of.

We discuss the feasibility of a weak charged current experiment using a low energy electron beam. A first goal is to measure the Q 2 dependence of the axial-vector form factor g a (Q 2).It can be measured model-independently and as robustly as for electromagnetic form factors from typical electron scattering experiments, in contrast to the methods used so far to measure g a (Q 2).

Summary I Introduction: photon-hadron scattering I The Sakai-Sugimoto model I The ρmeson form factors in the Sakai-Sugimoto model I The ρmeson structure functions I Conclusions and perspectives Carlos Alfonso Ballon Bayona, Durham University Electromagnetic scattering of vector mesons in the Sakai-Sugimoto model.

JuneParis. Form factors, polarizabilities and excitation spectra are di erent aspects of many- vector mesons in and above the threshold region. There are strong indications of a resonance structure near threshold, and violating electron scattering,N(~e;e 0)N.

Abstract. The structures observed between 1 and 2 Gev in the pion form factor as well as in the e(+)e(-) annihilation into many hadrons are analyzed in two different manners: (1) by postulating the existence of higher vector mesons or (2) by using a new rho meson propagator which incorporates in a simple way the effects of an energy dependant width and of a strong inelasticity.

The new experimental data for the proton form factor ratio are in excellent agreement with a phenomenological model of the nucleon put forward in [10] wherein the external photon couples both to an intrinsic structure and to a meson cloud through the intermediate vector mesons (‰,!, and ’).

The linear drop in the proton form factor. 3 form factors. However vector FFs are not independent, they can be expressed in terms of ones from elastic electron-nucleon scattering. This relation originates from conserved vector current hypotheses (CVC) [2]: F a(Q2)=Fep a (Q 2) Fen a (Q 2); a =1;2: () So far as this work is just a generalization of the theory of e N elastic scattering.

The chapter further explains the axial form factors, and the names given to the three axial form factors are—g 1 The K e4 decay is especially interesting because it enables to study in pure form the scattering of pions on pions. The chapter also discusses relations between the amplitudes for leptonic decays of baryons.

the vector form. In high energy physics, a vector meson is a meson with total spin 1 and odd parity (usually noted as J P = 1 −).Vector mesons have been seen in experiments since the s, and are well known for their spectroscopic pattern of masses.

The vector mesons contrast with the pseudovector mesons, which also have a total spin 1 but instead have even vector and pseudovector mesons are. s is the scattering density of the matrix, may be very small for biological samples X-rays neutrons • X-rays: scattering factor increases with atomic number, no difference between H and D • Neutrons: scattering factor is irregular, may be negative, huge difference.

In the ies the first measurements of the electromagnetic form factors of the nucleons in electron-scattering experiments were performed. The interpretation of the form-factor measurements was the second path that led to the existence of vector mesons.

Based on a picture of the nucleon as a core surrounded by a pion cloud. The strange-quark vector current {rho}-to-{pi} meson transition form factor is computed at one-loop order using strange meson intermediate states.

A comparison is made with a {phi}-meson dominance model estimate. They find that one-loop contributions are comparable in magnitude to those predicted by {phi}-meson dominance.

The single scattering law for projected angle scattering is taken to be the Rutherford scattering law for projected angle scattering modified at small angles by electron shielding and at large angles by a nuclear form factor F{sub n}({phi}/{phi}{sub o}) which gives the effect of the finite nuclear size.

As seen on the atomic scattering factors, the scattering density of the depends not only on the number of electrons, but as well on the distribution of these electrons around the atom.

This electron density can be defind as follows: b j j dV j With the dV j as the volume element surrounding the scattering center. X-ray scattering. Abstract. We present elastic e-d scattering observables obtained from the recent N-N interaction models proposed by the Bonn and Nijmegen groups.

In particular, we discuss the pertinent results for the electric and magnetic structure functions as well as the deuteron tensor polarization and charge form factor, especially with respect to their dependence on the choice of the nucleon form factors.

obtained with elastic magnetic electron scattering, mak-ing use of the magnetic form factor of the neutron [7, 8]. However, most experimental methods use hadron in-duced reactions such as for example, proton, pion or kaon scattering from nuclei.

The analysis of such reac-tions requires scattering theories for strongly interacting. An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker.

Audio. An illustration of a " floppy disk. Electron-positron annihilation into phi f_{0}() and clues for a new 1^{--} resonance Item Preview. Electromagnetic nucleon form factors have been determined from Rosenbluth plots and, independently, by fitting a dispersion ansatz to electron-nucleon scatte.

Relativistic electron diffraction depends on linear and quadratic terms in the electric potential, the latter being neglected in the frequently used relativistically corrected Schrödinger equation. Conventional tabulations for electron scattering and its large-angle extrapolations can be amended in closed form by a universal correction based on the screened Coulomb potential squared.

where Q25q22v2, uis the scattering angle of electron. The PV response functions WAV T,L arise from electron axial vector ~A. 3 hadronic vector current ~V. interactions, while WVA T8 is generated by the V(e)3A(had.) interaction. At tree level in the standard model, the electron vector coupling to.

Studies of electron scattering from nuclei are a beautcful example of this very point, and we will learn m~ueh more about this from Dr. Walecka later on. The form factor is measured by elastic scattering.+ + F(q) = J d3r p(r) el”’ (1).scalar, vector-pseudoscalar and vector-vector mesons are presented.

Numerical Since the vector coupling of Z” to the electron is close to zero (sin28w = dependence of the form factor is controlled by the hard scattering amplitude 2’ ~ which is computed by .The longitudinal response functions for quasielastic electron scattering on 12C, 40Ca and 56Fe have been calculated in r.