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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 (?////).

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Pi+- and pi0 production by polarized photons in the resonance region

Alspector, J. ; Fox, D. ; Luckey, David ; et al.

Phys.Rev.Lett. 28 (1972) 1403-1406, 1972.

Inspire Record 75484 DOI 10.17182/hepdata.21872

We have measured the cross sections at 90° c.m. for π± and π0 photoproduction with polarized photons. The photon energies ranged from 0.8 to 2.2 GeV. We compare the resonant "bumps" in the cross section with theoretical models. The measured asymmetry agrees with a quark-model calculation though the predicted cross sections are low.

5 data tables

Table 1

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Table 2

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Table 3

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Pi+ photoproduction from hydrogen with polarized photons

Bar-Yam, Z. ; De Pagter, J. ; Dowd, J. ; et al.

Phys.Rev.Lett. 25 (1970) 1053-1056, 1970.

Inspire Record 62861 DOI 10.17182/hepdata.21600

The reaction γ⊥,∥p→π+n has been studied with linearly polarized photons of energy 3.0 GeV at −t values between 0.15 and 1.2 (GeVc)2. The asymmetry A+=(dσ⊥−dσ∥)(dσ⊥+dσ∥) is found to be positive throughout this four-momentum-transfer range, implying the dominance of natural parity exchange in the t channel. Comparison of dσ⊥(γ⊥p→π+n) and dσ⊥p→π−p) from a previous experiment indicates strong interference between the isoscalar and isovector photon amplitudes for photons polarized perpendicular to the production plane.

3 data tables

Table 1

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Table 2

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Table 3

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RECOIL PROTON POLARIZATION IN ETA PHOTOPRODUCTION

Heusch, C.A. ; Prescott, C.Y. ; Rochester, L.S. ; et al.

Phys.Rev.Lett. 25 (1970) 1381, 1970.

Inspire Record 61494 DOI 10.17182/hepdata.21581

We measured the polarization of the recoil proton in the process γp→pη0, at 90° in the center-of-mass system, at incoming photon energies from 0.8 to 1.1 GeV. Detection of all three particles in the final state pγγ permitted observation of this process with little background. Subsequent rescattering off carbon nuclei yielded sizable polarization values for the protons, indicating considerable S−P—wave interference in the production process.

1 data table

Table 1

No description provided.

RECOIL PROTON POLARIZATION IN pi0 PHOTOPRODUCTION

Bloom, Elliott D. ; Heusch, C.A. ; Prescott, C.Y. ; et al.

Phys.Rev.Lett. 19 (1967) 671, 1967.

Inspire Record 51327 DOI 10.17182/hepdata.21757

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1 data table

Table 1

No description provided.

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MEASUREMENT OF THE POLARIZATION OF CUMULATIVE PROTONS, EMITTED AT ANGLES OF 110-degrees AND 135-degrees IN THE LABORATORY SYSTEM IN REACTIONS pi- A ---> p X AT 1.5-GeV/c PION MOMENTA

POLARIZED CUMULATIVE PROTONS

Cross-Section Asymmetry of eta Mesons Photoproduction by Polarized Photons in the Resonance Region

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

Pi+- and pi0 production by polarized photons in the resonance region

Pi+ photoproduction from hydrogen with polarized photons

RECOIL PROTON POLARIZATION IN ETA PHOTOPRODUCTION

RECOIL PROTON POLARIZATION IN pi0 PHOTOPRODUCTION