Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

Hamilton, D.

doi:10.1103/physrevlett.94.242001

Cited by 27 publications

(10 citation statements)

References 29 publications

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“…Much more detail concerning the Compton measurement and connected theories can be found in the articles and theses by D. Hamilton [51,52], A. Danagoulian [53,54] and V. Mamyan [55].…”

Section: Previous Results and Experimentsmentioning

confidence: 99%

“…Table 2.1: The Kinematic points. 3E (bold) was the point used for the polarization transfer analysis [52] and 4A* along with 3A* (italics) are the points used for the HRS optics calibration. The kinematic points are grouped into 2-, 3-, 4-and 5-pass data given by the number of turns around the accelerator necessary to reach the desired energy.…”

Section: The Continuous Electron Beam Accelerator Facilitymentioning

confidence: 99%

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Pion photoproduction cross section at large momentum transfer

Sjögren¹

2015

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The Real Compton Scattering experiment was performed in Hall A at the Thomas Jefferson National Accelerator Facility. It was designed to measure, for Compton scattering and π 0-photoproduction, the differential cross section over a range of kinematic points and the polarisation transfer to the proton at a single kinematic point. The full range of the experiment in Mandelstam variables t and s was 1.64−6.46 GeV 2 and 4.82−10.92 GeV 2 respectively with beam energies of 2−6 GeV. The motivation for the experiment is to test the cross section and polarisation transfer predictions of perturbative QCD versus that of predictions from Generalised Parton Distribution models. This thesis will give an overview of the pertinent theory, experimental setup in Hall A and the extracting of the π 0-photoproduction cross section.

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“…Much more detail concerning the Compton measurement and connected theories can be found in the articles and theses by D. Hamilton [51,52], A. Danagoulian [53,54] and V. Mamyan [55].…”

Section: Previous Results and Experimentsmentioning

confidence: 99%

Section: The Continuous Electron Beam Accelerator Facilitymentioning

confidence: 99%

Pion photoproduction cross section at large momentum transfer

Sjögren¹

2015

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“…scattering angle of 70 deg [41] and at s ¼ 6.9 GeV 2 and θ ¼ 120° [ 42]. These kinematical settings do not respect the requirement of large Mandelstam variables; either −t or −u is too small.…”

Section: B Spin Effectsmentioning

confidence: 99%

“…According to [30] the uncertainties of the parameters (41) and (42) are large, of order of 30%. We are now in the position to evaluate the photoproduction cross section defined by…”

Section: Predictions For Photoproduction Of Pseudoscalar Mesonsmentioning

confidence: 99%

Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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We investigate wide-angle π 0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the π 0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

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“…THe BigCal electromagnetic calorimeter provided position and energy measurements of the scattered electrons and photons. It consisted of 1744 lead glass blocks and was divided into two sections.The upper section (RCS) was from the Yerevan Physics Institute and was previously used during the RCS experiment[60]. Consisting of 4×4×40 cm 3 lead-glass blocks, the RCS blocks were arranged in a 30 × 24 array.…”

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confidence: 99%

Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces

Armstrong¹

2015

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The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function g 2 in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element d p 2 (an integral of g 2 weighted by x 2) is most sensitive. The data was taken from Q 2 equal to 2.5 GeV 2 up to 6.5 GeV 2. In this polarized electron scattering off a polarized hydrogen target experiment, two double spin asymmetries, A and A ⊥ were measured using the BETA (Big Electron Telescope Array) Detector. BETA consisted of a scintillator hodoscope, gasČerenkov counter, lucite hodoscope and a large lead glass electromagnetic calorimeter. With a unique open geometry, a threshold gasČerenkov detector allowed BETA to cleanly identify electrons for this inclusive experiment. A measurement of d p 2 is compared to lattice QCD calculations.

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Polarization Transfer in Proton Compton Scattering at High Momentum Transfer

Cited by 27 publications

References 29 publications

Pion photoproduction cross section at large momentum transfer

Pion photoproduction cross section at large momentum transfer

Twist-3 contributions to wide-angle photoproduction of pions

Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces

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