Measuring Proton Spin Polarizabilities with Polarized Compton Scattering PDF Download
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Author: Philippe Paul Martel
Publisher:
ISBN:
Category : Compton effect
Languages : en
Pages : 208
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Author: Philippe Paul Martel
Publisher:
ISBN:
Category : Compton effect
Languages : en
Pages : 208
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 15203
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Book Description
Polarized Compton scattering off the proton is studied within the framework of subtracted dispersion relations for photon energies up to 300 MeV. As a guideline for forthcoming experiments, we focus the attention on the role of the proton's spin polarizabilities and investigate the most favorable conditions to extract them with a minimum of model dependence. We conclude that a complete separation of the four spin polarizabilities is possible, at photon energies between threshold and the $\Delta(1232)$ region, provided one can achieve polarization measurements with an accuracy of a few percent.
Author: Robert M. D. Materi
Publisher:
ISBN:
Category : Polarizability (Electricity)
Languages : en
Pages : 88
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Author: Frank Wissmann
Publisher: Springer Science & Business Media
ISBN: 9783540407423
Category : Science
Languages : en
Pages : 170
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A comprehensive summary of experiments on Compton scattering from the proton and neutron performed at the electron accelerator MAMI. The experiments cover a photon energy range from 30 MeV to 500 MeV. The reader is introduced to the theoretical concepts of Compton scattering, followed by a description of the experiments on the proton, their analysis and results.
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Category :
Languages : en
Pages :
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Wide-angle exclusive Compton scattering and single-pion photoproduction from the proton have been investigated via measurement of the polarization transfer from a circularly polarized photon beam to the recoil proton. The WACS polarization transfer was analyzed at an incident photon energy of 3.7 GeV at a proton scattering angle of [theta]Pcm = 70°. The longitudinal transfer KLL, measured to be 0.645 ± 0.059 ± 0.048, where the first error is statistical and the second is systematic, has the same sign as predicted for the reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton. However, the observed value is ~3 times larger than predicted by the GPD-based calculations, which indicates a significant unknown contribution to the scattering amplitude.
Author:
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Category :
Languages : en
Pages :
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Compton scattering from the proton was investigated at s = 6.9 GeV2 and t = -4.0 TeV2 via polarization transfer from circularly polarized incident photons. The longitudinal and transverse components of the recoil proton polarization were measured. The results are in excellent agreement with a prediction based on a reaction mechanism in which the photon interacts with a single quark carrying the spin of the proton and in disagreement with a prediction of pQCD based on a two-gluon exchange mechanism.
Author: Lu Ching-Fa
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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In the production of high energy photons from Compton scattering of particles by relativistic electrons, the inclusion of particle spin may significantly increase the scattering cross section and the degree of polarization. This paper studies the effect of various possible spin states on Compton scattering by relativistic electrons. The equation of differential cross section can be written according to the transition probability of particles. In the case of charged particles with longitudinal spin (spin parallel to direction of motion), an equation of energy distribution for secondary photons is derived. Calculation shows that the scattering cross section for the production of polarized high energy photons may be twice as large for particles with directional spin as for spinless particles. In the case of charged particles with transverse spin (spin perpendicular to direction of motion), the higher order approximations disappear in the relativistic case. Using a final state summation procedure, the scattering cross section equation for transverse spin charged particles can be easily reduced to the common Klein-Nishina formula for stationary electrons. Effected by the transverse spin, the scattered photons become partially or completely polarized despite the non-polarization of the primary photons. (Author).
Author: Nadiia Krupina
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 255
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In this thesis work, results of the analysis of the polarization transfers measured in real Compton scattering (RCS) by the Collaboration E07-002 at the Je fferson Lab Hall-C are presented. The data were collected at large scattering angle (theta_cm = 70deg) and with a polarized incident photon beam at an average energy of 3.8 GeV. Such a kind of experiments allows one to understand more deeply the reaction mechanism, that involves a real photon, by extracting both Compton form factors and Generalized Parton Distributions (GPDs) (also relevant for possibly shedding light on the total angular momentum of the nucleon). The obtained results for the longitudinal and transverse polarization transfers K_LL and K_LT, are of crucial importance, since they confirm unambiguously the disagreement between experimental data and pQCD prediction, as it was found in E99-114 experiment, and favor the Handbag mechanism. The E99-114 and E07-002 results can contribute to attract new interest on the great yield of the Compton scattering by a nucleon target, as demonstrated by the recent approval of an experimental proposal submitted to the Jefferson Lab PAC 42 for a Wide-angle Compton Scattering experiment, at 8 and 10 GeV Photon Energies. The new experiments approved to run with the updated 12 GeV electron beam at JLab, are characterized by much higher luminosities, and a new GEM tracker is under development to tackle the challenging backgrounds. Within this context, we present a new multistep tracking algorithm, based on (i) a Neural Network (NN) designed for a fast and efficient association of the hits measured by the GEM detector which allows the track identification, and (ii) the application of both a Kalman filter and Rauch-Tung-Striebel smoother to further improve the track reconstruction. The full procedure, id est NN and filtering, appears very promising, with high performances in terms of both association effciency and reconstruction accuracy, and these preliminary results will be discussed in detail in the last chapters.
Author: Loup Correa
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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