GAMMA P --> PI0 P
Polarization
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Asymmetry of the cross section of the reaction $\gamma$P $\rightarrow$ P$\pi^{0}$ in the energy interval 0.9-1.65 GeV at $\theta _{\pi}^{0 cms}$ = 110°

Abramyan, L.O. ; Avakyan, R.O. ; Akopov, N.Z. ; et al.
JETP Lett. 23 (1976) 375-378, 1976.
Inspire Record 1393126 DOI 10.17182/hepdata.39803

None

2 data tables
Table 1

THE ERRORS INCLUDE THE 10 PCT ERROR IN THE EFFECTIVE PHOTON POLARIZATION.

Table 2

No description provided.


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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Measurement of Asymmetry in Photoproduction of pi0 Meson in the Resonance Region

Avakian, R.O. ; Avakian, E.O. ; Avetisian, A.E. ; et al.
Yad.Fiz. 26 (1977) 1014-1017, 1977.
Inspire Record 126317 DOI 10.17182/hepdata.19036

None

1 data table
Table 1

Axis error includes +- 10/10 contribution.


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

No description provided.

Table 3

No description provided.

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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

No description provided.

Table 3

No description provided.


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.


Pi0 and pi+ Production with Polarized Photons in the Resonance Region

Abrahamian, L.O. ; Avakian, R.O. ; Aganyants, Aleksandr O. ; et al.
EFI-136-75-YEREVAN, 1975.
Inspire Record 100164 DOI 10.17182/hepdata.43767

None

2 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////).


Pi0 and pi+ Production with Polarized Photons in the Energy Range 1-GeV - 2-GeV

Abrahamian, L.O. ; Avakian, R.O. ; Aganyants, Aleksandr O. ; et al.
Phys.Lett.B 48 (1974) 463-466, 1974.
Inspire Record 90760 DOI 10.17182/hepdata.43798

The asymmetry of π o and π + photoproduction from hydrogen has been measured. The π o -mesons were detected at 130° cms with E γ ranged from 0.9 to 1.65 GeV, and the π + -mesons at 40° cms with E γ ranged from 0.9 to 1.2 GeV. The results agree with model predictions of single pion photoproduction in the resonance region using fixed- t dispersion relations.

7 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////).

Table 3

Axis error includes +- 0.0/0.0 contribution (?////).

More…

Polarization of secondary protons from the gamma + p ---> pi0 + p reaction in the third resonance region

Derebchinskii, A.I. ; Tonapetyan, S.G. ; Konovalov, O.G. ; et al.
Zh.Eksp.Teor.Fiz. 66 (1974) 68-73, 1974.
Inspire Record 96653 DOI 10.17182/hepdata.39968

None

1 data table
Table 1

No description provided.


Recoil-proton polarization in neutral-pion photoproduction between 1000 and 1800 mev

Tanaka, N. ; Castro, M.M. ; Milburn, Richard H. ; et al.
Phys.Rev.D 8 (1973) 1-8, 1973.
Inspire Record 81985 DOI 10.17182/hepdata.22112

Measurements are presented of the recoil-proton polarization for π0 photoproduction angles near 64° in the c.m. system. The steep angular dependence observed by others at lower energies persists to at least 1500 MeV, and the polarization crosses through zero near 63° over the entire 900-1600-MeV energy interval. Summary fits are made to available recoil-proton polarization data, 950-1250 MeV, and are found to require terms of order cos3θ, but no higher.

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).