Badea, Anthony
[1.0, 2.0]
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Inclusive hadron photoproduction from longitudinally polarized protons and deuterons.

The E155 collaboration Anthony, P.L. ; Arnold, R.G. ; Averett, T. ; et al.
Phys.Lett.B 458 (1999) 536-544, 1999.
Inspire Record 495554 DOI 10.17182/hepdata.28074

We report measurements of the asymmetry A_parallel for inclusive hadron production on longitudinally polarized proton and deuteron targets by circularly polarized photons. The photons were produced via internal and external bremsstrahlung from an electron beam of 48.35 GeV. Asymmetries for both positive and negative signed hadrons, and a subset of identified pions, were measured in the momentum range 10<P<30 GeV at 2.75 and 5.5 degrees. Small non-zero asymmetries are observed for the proton, while the deuteron results are consistent with zero. Recent calculations do not describe the data well.

4 data tables
Table 1

The asymmetry for polarized photoproduction of inclusive hadrons from a polarized proton target. The errors are statistical only.

Table 2

The asymmetry for polarized photoproduction of inclusive identified pions from a polarized proton target. The errors are statistical only.

Table 3

The asymmetry for polarized photoproduction of inclusive hadrons from a polarized deuteron target. The errors are statistical only.

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Compton scattering by the proton through Theta(CMS) = 75-degrees and 90-degrees in the Delta resonance region

Hünger, A ; Peise, J ; Robbiano, A ; et al.
Nucl.Phys.A 620 (1997) 385-416, 1997.
Inspire Record 458618 DOI 10.17182/hepdata.36349

Differential cross sections for Compton scattering by the proton have been measured in the energy interval between 200 and 500 MeV at scattering angles of θ cms = 75° and θ cms = 90° using the CATS, the CATS/TRAJAN, and the COPP setups with the Glasgow Tagger at MAMI (Mainz). The data are compared with predictions from dispersion theory using photo-meson amplitudes from the recent VPI solution SM95. The experiment and the theoretical procedure are described in detail. It is found that the experiment and predictions are in agreement as far as the energy dependence of the differential cross sections in the Δ-range is concerned. However, there is evidence that a scaling down of the resonance part of the M 1+ 3 2 photo-meson amplitude by (2.8 ± 0.9)% is required in comparison with the VPI analysis. The deduced value of the M 1+ 3 2 - photoproduction amplitude at the resonance energy of 320 MeV is: |M 1+ 3 2 | = (39.6 ± 0.4) × 10 −3 m π + −1 .

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Photoproduction of $\pi^0$ from Hydrogen near the Second Pion-Nucleon Resonance

DeStaebler, H.C. ; Erickson, E.F. ; Hearn, Anthony C. ; et al.
Phys.Rev. 140 (1965) B336-B348, 1965.
Inspire Record 48749 DOI 10.17182/hepdata.26402

Angular distributions for π0 photoproduction from hydrogen at energies between 660 and 800 MeV and proton center-of-mass angles from 0° to 140° have been measured and analyzed. Some variation from a pure d32 state is seen in the resonance region. A possible high-momentum-transfer enhancement of the cross section is discussed.

13 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

Table 2

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

Table 3

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

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