Bargholtz, Chr.
Polarization
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Pion production with polarized photons and test of vector dominance model

Geweniger, Chr. ; Heide, P. ; Kötz, U. ; et al.
Phys.Lett.B 28 (1968) 155-156, 1968.
Inspire Record 1392676 DOI 10.17182/hepdata.29098

Cross section asymmetries for the sum of single π + and π - production with polarized photons of 3.4 GeV have been measured. The results disagree with calculations based on the vector dominance model using experimental data of vector meson production in π beams.

1 data table
Table 1

No description provided.


Measurement of the Beam Asymmetry $\Sigma$ in the Forward Direction for pi0 Photoproduction

The CBELSA/TAPS collaboration Sparks, N. ; Crede, V. ; Anisovich, A.V. ; et al.
Phys.Rev.C 81 (2010) 065210, 2010.
Inspire Record 848088 DOI 10.17182/hepdata.55293

Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$\Sigma$ has been extracted for $115^\circ < \theta_{\rm c.m.} < 155^\circ$ of the $\pi^0$~meson and for $\theta_{\rm c.m.} < 60^\circ$. The new beam asymmetry data improve the world database for photon energies above 1.5~GeV and, by covering the very forward region, extend previously published data for the same reaction by our collaboration. The angular dependence of $\Sigma$ shows overall good agreement with the SAID parameterization.

23 data tables
Table 1

Photon beam asymmetry at incident photon energy 0.932 GeV.

Table 2

Photon beam asymmetry at incident photon energy 0.965 GeV.

Table 3

Photon beam asymmetry at incident photon energy 0.998 GeV.

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