Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer
Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer

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Published: 2004

Total Pages: 153

ISBN-13:

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The Jefferson Lab Hall A experiment E99-114 comprised a series of measurements to explore proton Compton scattering at high momentum transfer. For the first time, the polarisation transfer observables in the p ($ ec{γ}$, ?' ec{p}$) reaction were measured in the GeV energy range, where it is believed that quark-gluon degrees of freedom begin to dominate. The experiment utilised a circularly polarised photon beam incident on a liquid hydrogen target, with the scattered photon and recoil proton detected in a lead-glass calorimeter and a magnetic spectrometer, respectively.

Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer
Polarisation Transfer in Proton Compton Scattering at High Momentum Transfer

Author:

Publisher:

Published: 2004

Total Pages:

ISBN-13:

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The Jefferson Lab Hall A experiment E99-114 comprised a series of measurements to explore proton Compton scattering at high momentum transfer. For the first time, the polarisation transfer observables in the p (~ 0 ~ p) reaction were measured in the GeV energy range, where it is believed that quark-gluon degrees of freedom begin to dominate. The experiment utilised a circularly polarised photon beam incident on a liquid hydrogen target, with the scattered photon and recoil proton detected in a lead-glass calorimeter and a magnetic spectrometer, respectively.

Polarization Transfer in Proton Compton Scattering at High Momentum Transfer
Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

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Publisher:

Published: 2004

Total 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.

Exclusive Processes at High Momentum Transfer
Exclusive Processes at High Momentum Transfer

Author: A. V. Radyushkin

Publisher: World Scientific

Published: 2002

Total Pages: 416

ISBN-13: 9812382550

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This book focuses on the physics of exclusive processes at high momentum transfer and their description in terms of generalized parton distributions, perturbative QCD, and relativistic quark models. It covers recent developments in the field, both theoretical and experimental. Contents: Perspectives on Exclusive Processes in QCD (S J Brodsky); High-t Meson Photo- and Electroproduction: A Window on Partonic Structure of Hadrons (J-M Laget); Nucleon Hologram with Exclusive Leptoproduction (A Belitsky & D Muller); QCD Factorization for the Pion Diffractive Dissociation into Two Jets (D Yu Ivanov); GPDs, Form Factors and Compton Scattering (P Kroll); Real Compton Scattering from the Proton (A Nathan); Resonance Exchange Contributions to Wide-Angle Compton Scattering: The D-Term (T Oppermann); Proton-Antiproton Annihilation into Two Photons at Large s (C Weiss); Quark--Hadron Duality Studies at Jefferson Lab; An Overview of New and Exisiting Results (C Keppel); Novel Hard Semiexclusive Processes and Color Singlet Clusters in Hadrons (M Strikman et al.); and other papers. Readership: Theoretical and experimental researchers in nuclear and elementary particle physics.

Exclusive & Semi-exclusive Processes At High Momentum Transfer
Exclusive & Semi-exclusive Processes At High Momentum Transfer

Author: Carl Carlson

Publisher: World Scientific

Published: 2000-07-20

Total Pages: 359

ISBN-13: 9814542830

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This book constitutes the proceedings of a workshop on 'Exclusive and Semi-exclusive Processes at High Momentum Transfer', sponsored by the Institute for Nuclear Theory (Seattle) and the Thomas Jefferson National Accelerator Facility (Jefferson Laboratory). The workshop was inspired by recent progress in the field, particularly in the uses of off-forward or skewed parton distributions to elucidate nucleon structure. This book contains the written versions of 41 scientific talks, on subjects including the aforementioned skewed parton distributions, and also on deeply virtual Compton scattering, semi-exclusive (or semi-inclusive) reactions, and hard elastic and transition form factors.

Exclusive Reactions At High Momentum Transfer Iv - Proceedings Of The 4th Workshop
Exclusive Reactions At High Momentum Transfer Iv - Proceedings Of The 4th Workshop

Author: Anatoly Radyushkin

Publisher: World Scientific

Published: 2011-02-25

Total Pages: 486

ISBN-13: 9814462500

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The Proceedings include talks given at the 4th Workshop on Exclusive Reactions at High Momentum Transfer at Jefferson Lab, Newport News, VA USA, the world's leading facility performing research on nuclear, hadronic and quark-gluon structure of matter. Exclusive reactions are becoming one of the major sources of information about the deep structure of the nucleons and other hadrons. The workshop focused on the application of a variety of exclusive reactions at high momentum transfer, utilizing unpolarized and polarized beams and targets, to obtain information about nucleon ground state and excited state structure at short distances. This is a subject which is central to the programs of current accelerators and especially planned future facilities. The topics include: generalized parton distributions, deeply virtual Compton scattering, deeply virtual meson production (DVMP), transverse structure of hadrons (TMD), hadron form factors — elastic and transition, quantum chromodynamics (perturbative, non-perturbative, lattice calculations), and physics to study at an Electron Ion Collider.

The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer
The Two-Photon Exchange Contribution to Elastic Electron-Nucleon Scattering at Large Momentum Transfer

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Published: 2005

Total Pages:

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We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide angle scattering processes. We find that the interference of one- and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.