Photoproduction
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PHOTOPRODUCTION OF pi0 WITH PLANE POLARIZED 3-Gev PHOTONS

Bellenger, D. ; Bordelon, R. ; Cohen, K. ; et al.
Phys.Rev.Lett. 23 (1969) 540, 1969.
Inspire Record 55099 DOI 10.17182/hepdata.21666

The cross section for photoproduction of π0 mesons was measured at a photon energy of 3 GeV and squared four-momentum transfer (t) of -0.1 to -1.2 (GeV/c)2 using plane-polarized photons. The asymmetry was found to be consistent with +1.0 for t values above -0.4 and below -1.1. For −0.4<~t<~−1.0 there is a dip in the asymmetry and at t=−0.6 it drops to 0.55 ± 0.15. This result precludes a simple Regge model with ω0 and B; a theoretical description requires Regge cuts or an ω′ exchange.

2 data tables
Table 1

No description provided.

Table 2

MIT PREP (1967).


PROTON POLARIZATION IN THE PHOTODISINTEGRATION OF THE DEUTERON BY LINEARLY POLARIZED 400-MEV AND 500-MeV GAMMA RAYS

Bratashevsky, A.S. ; Gorbenko, V.G. ; Gushchin, V.A. ; et al.
JETP Lett. 35 (1982) 605-607, 1982.
Inspire Record 184506 DOI 10.17182/hepdata.16942

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Polarized Target Asymmetry in pi0 Photoproduction Between 0.4-GeV and 1.0-GeV Around 100-Degrees

Feller, P. ; Fukushima, M. ; Horikawa, N. ; et al.
Phys.Lett.B 55 (1975) 241-244, 1975.
Inspire Record 90929 DOI 10.17182/hepdata.35716

The polarized target asymmetry in the reaction γp→π°p has been measured at c.m. angles around 100° for photon energies between 0.4 and 1.0 GeV by detecting both the recoil proton and the π°. The result is compared with recent analyses.

1 data table
Table 1

No description provided.


Target asymmetry for neutral pi meson photoproduction on polarized protons at 4 GeV in the forward direction

Bienlein, H. ; Braunschweig, W. ; Dinter, H. ; et al.
Phys.Lett.B 46 (1973) 131-134, 1973.
Inspire Record 84690 DOI 10.17182/hepdata.28065

The asymmetry A = (σ + −σ − ) (σ + +σ − ) of the reaction γ p↑↓ → π 0 p was measured at the Deutsches Elektronen Synchrotron DESY, Hamburg at a mean photon energy of 4.0 GeV in the four-momentum transfer range 0.2 (GeV/ c ) 2 ⩽ −t ⩽ 1.1 (GeV/ c ) 2 in steps of approximately 0.08 (GeV/ c ) 2 . The π 0 -meson and the proton were detected in coincidence. The asymmetry is compatible with zero in the t -range 0.2 (GeV/ c ) 2 ⩽ − t ⩽ 0.4 (GeV/ c ) 2 and negative in the t -range ⩾ 0.5 (GeV/ c ) 2 .

1 data table
Table 1

No description provided.


Measurement of Asymmetries in Polarized gamma + n --> pi + n, with E(gamma) from 600-MeV to 900-MeV

Knies, G. ; Oberlack, H. ; Rittenberg, A. ; et al.
Phys.Rev.D 10 (1974) 2778, 1974.
Inspire Record 90220 DOI 10.17182/hepdata.24943

We report on the measurement of asymmetries in the single-pion photoproduction reactions γp→nπ+, γp→pπ0, and γn→pπ−, induced by linearly polarized photons of energies from 610 to 940 MeV. The experiment was carried out using the back-scattered laser beam and the 82-in. dubble chamber at SLAC. We compare the new data with predictions from a partial-wave analysis.

13 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurements of the Double Polarization Parameters $G$ and $H$ in Neutral Pion Photoproduction

Bussey, P.J. ; Rutherglen, J.G. ; Booth, P.S.L. ; et al.
Nucl.Phys.B 159 (1979) 383-396, 1979.
Inspire Record 141663 DOI 10.17182/hepdata.34624

Measurements have been made of the double polarisation parameters G and H in the photoproduction of neutral pions from protons, for incident photon energies between 1300 MeV and 2300 MeV and for pion c.m. angles between 50δ and 80δ. The results are compared with predictions from a recent comprehensive analysis of earlier photoproduction data.

11 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurements of the Polarization Parameters in G and $H$ in Positive Pion Photoproduction

Bussey, P.J. ; Rutherglen, J.G. ; Booth, P.S.L. ; et al.
Nucl.Phys.B 169 (1980) 403-414, 1980.
Inspire Record 152385 DOI 10.17182/hepdata.43803

Measurements have been made of the polarisation parameters G and H for the process γ p→ π + n in the photon energy range 600–1875 MeV and pion c.m. angles between 30° and 100°. These data were obtained in a double polarisation experiment, in which the polarised photon beam from the Daresbury electron synchrotron was incident upon a polarised proton target. Theoretical predictions from a current analysis are compared with the data.

7 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of asymmetry in spin dependent e p resonance region scattering.

Baum, Guenter ; Bergstrom, M.R. ; Clendenin, J.E. ; et al.
Phys.Rev.Lett. 45 (1980) 2000, 1980.
Inspire Record 154062 DOI 10.17182/hepdata.20698

The first measurements are reported of the asymmetry in resonance-region scattering of longitudinally polarized electrons by longitudinally polarized protons. Data have been obtained at Q2=0.5 and 1.5 (GeV/c)2 in the missing-mass range W=1.1−1.9 GeV. Results are compatible with a multipole analysis of single-pion electroproduction. The spin-dependent behavior is consistent with a duality mechanism as in the unpolarized case.

4 data tables
Table 1

ELECTRON ASYMMETRY AT Q**2 ABOUT 0.5 GEV**2.

Table 2

ELECTRON ASYMMETRY AT Q**2 ABOUT 1.5 GEV**2.

Table 3

PHOTON ASYMMETRY AT Q**2 ABOUT 0.5 GEV**2.

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PRODUCTION OF POSITIVE PIONS ON POLARIZED PROTONS BY LINEARLY POLARIZED PHOTONS IN THE ENERGY REGION 300-MEV - 420-MEV. (IN RUSSIAN)

Getman, V.A. ; Gorbenko, V.G. ; Grushin, V.F. ; et al.
Yad.Fiz. 32 (1980) 1008-1019, 1980.
Inspire Record 159789 DOI 10.17182/hepdata.18891

None

6 data tables
Table 1

SEE ABBREVIATIONS IN CR.

Table 2

SEE ABBREVIATIONS IN CR.

Table 3

SEE ABBREVIATIONS IN CR.

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MEASUREMENT OF POLARIZATION OF PROTONS IN THE REACTION GAMMA P ---> P PI0 IN A PHOTON LINEARLY POLARIZED BEAM. (IN RUSSIAN)

Avakian, R.O. ; Avakian, E.O. ; Avetisian, A.E. ; et al.
Yad.Fiz. 36 (1982) 393-399, 1982.
Inspire Record 183654 DOI 10.17182/hepdata.17730

None

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////ERROR IN POLARIZATION OF INITIAL GAMMAS IS NOT GIVEN).