Lawall, R.
GAMMA P --> PI0 P
Polarization
[1.743]
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Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton

The CBELSA & TAPS collaborations Elsner, D. ; Bantes, B. ; Bartholomy, O. ; et al.
Eur.Phys.J.A 39 (2009) 373-381, 2009.
Inspire Record 799078 DOI 10.17182/hepdata.50479

At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear polarisation can be deliberately chosen by accurate positioning of the crystal with a goniometer. The degree of polarisation is determined by the form of the scattered electron spectrum. Good agreement between experiment and expectations on basis of the experimental conditions is obtained. Polarisation degrees of P = 40% are typically achieved at half of the primary electron energy. The determination of P is confirmed by measuring the beam asymmetry, \Sigma, in pi^0 photoproduction and a comparison of the results to independent measurements using laser backscattering.

20 data tables
Table 1

Beam asymmetry as a function of the PI0 centre of mass scattering angle.

Table 2

Beam asymmetry as a function of the PI0 centre of mass scattering angle.

Table 3

Beam asymmetry as a function of the PI0 centre of mass scattering angle.

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The Polarized Target Asymmetry for Neutral Pion Photoproduction from Protons in the Photon Energy Range 0.7-GeV-1.45-GeV

Booth, P.S.L. ; Carroll, L.J. ; Court, G.R. ; et al.
Nucl.Phys.B 121 (1977) 45-57, 1977.
Inspire Record 111591 DOI 10.17182/hepdata.35454

Measurements have been made of the target asymmetry parameter for photoproduction of π 0 mesons from protons, using a butanol polarised target with a 3 He cryostat. Results were obtained at 14 incident photon energies between 0.7 GeV and 1.45 GeV over an angular range ∼40° to 145° c.m. The recent analysis of Barbour and Crawford provides a very good fit to the data.

14 data tables
Table 1

No description provided.

Table 2

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Table 3

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Angular Dependence of the Polarization of the Recoil Proton from the Reaction gamma p --> pi0 p in the Region of the Third Resonance

Blum, P. ; Brockmann, R. ; Mohr, W. ;
Z.Phys.A 278 (1976) 275, 1976.
Inspire Record 108304 DOI 10.17182/hepdata.16615

The polarization of the recoil proton from the reactionγp→π0p has been measured for photon energies between 900–1,350 MeV and pion c.m. angles between 70° and 150°. There are significant deviations from recent analysis.

3 data tables
Table 1

No description provided.

Table 2

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Table 3

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Angular Dependence of the Polarization of the Recoil Proton from the Reaction gamma p --> pi0 p in the Region of the Second Resonance

Blum, P. ; Brinckmann, P. ; Brockmann, R. ; et al.
Z.Phys.A 277 (1976) 311, 1976.
Inspire Record 108242 DOI 10.17182/hepdata.16619

The polarization of the recoil proton from the reactionγp→π0p has been measured for photon energies between 600 and 1,200 MeV and pion c.m. angles between 90° and 150°.

1 data table
Table 1

No description provided.


The recoil proton polarization in the reaction gamma p ---> pi0 p in the third resonance region

Prentice, M.N. ; Railton, R. ; Rutherglen, J.G. ; et al.
Nucl.Phys.B 41 (1972) 353-364, 1972.
Inspire Record 75162 DOI 10.17182/hepdata.32916

Measurements have been made of the polarization of the recoil proton in the process γ p → π o p for photon energies of 850 - 1250 MeV and centre-of-mass angles of 80° - 125°. The results, which are to a typical accuracy of ±0.09, show a marked disagreement with previous phenomenological analyses above 1000 MeV.

5 data tables
Table 1

No description provided.

Table 2

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Table 3

No description provided.

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Angular dependence of the recoil proton polarization from the reaction $\gamma p \to \pi^0 p$ for photon energies between 360-MeV and 1200-MeV

Blum, P. ; Brinckmann, P. ; Brockmann, R. ; et al.
BONN-PI-1-105, 1970.
Inspire Record 1085812 DOI 10.17182/hepdata.70500

None

6 data tables
Table 1

No description provided.

Table 2

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Table 3

No description provided.

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