Polarization Parameters in Positive Pion Photoproduction

Bussey, P.J. ; Raine, C. ; Rutherglen, J.G. ; et al.
Nucl.Phys.B 154 (1979) 205-225, 1979.
Inspire Record 140382 DOI 10.17182/hepdata.43832

Measurements have been made of the polarisation parameters Σ , T and P for the process γ p → π + n in the photon energy range 520–2250 MeV at c.m. angles between 30° and 120°. These data were obtained in a double polarisation experiment, using the polarised photon beam from the Daresbury electron synchrotron incident on a polarised proton target. The data are compared with predictions from current theoretical analyses.

1 data table match query

No description provided.


Measurement of the reaction gamma p ---> K0 Sigma+ at photon energies up to 2.6-GeV

Lawall, R. ; Barth, J. ; Bennhold, C. ; et al.
Eur.Phys.J.A 24 (2005) 275-286, 2005.
Inspire Record 680746 DOI 10.17182/hepdata.43595

The reaction gamma p --> K0 Sigma+ was measured in the photon energy range from threshold up to 2.6 GeV with the SAPHIR detector at the electron stretcher facility, ELSA, in Bonn. Results are presented on the reaction cross section and the polarization of the Sigma+ as a function of the kaon production angle in the centre-of-mass system, cos(Theta_K^{c.m.}), and the photon energy. The cross section is lower and varies less with photon energy and kaon production angle than that of gamma p --> K+ Sigma0. The Sigma+ is polarized predominantly at cos(Theta_K^{c.m.}) \approx 0. The data presented here are more precise than previous ones obtained with SAPHIR and extend the photon energy range to higher values. They are compared to isobar model calculations.

1 data table match query

Polarization parameter of the SIGMA+ as a function of angle in two photon energy ranges.


Polarization of Recoil Protons Produced in Elastic Scattering at 307 Mev

Grigorev, E.L. ; Mitin, N.A. ;
Sov.Phys.JETP 10 (1960) 295-301, 1960.
Inspire Record 1096726 DOI 10.17182/hepdata.12

Results are presented of an investigation of the polarization of recoil protons appearing in elastic 1r+ -p scattering through an angle of 140 ± 8° in the c.m.s. at an energy of 307 ± 5 Mev. A polarization value P 1 = -0.19 ± 0.17 has been deriver from the data on the magnitude of the left-right asymmetry in elastic scattering of recoil protons on photographic emulsion nuclei. Phase shifts satisfying the indicated polarization value and consistent with the differential cross section for elastic scattering of 71"+ -mesons by protons are given by Eq. (1). Problems connected with the use of various phase shift sets for analysis of the experimental data are discussed.

1 data table match query

No description provided.


PION-NUCLEON SCATTERING AT 310-MeV: NEUTRON POLARIZATION IN pi- p ---> pi0 n AND PHASE SHIFT ANALYSIS

Hill, Roger Eugene ;
PhD Thesis, 1964.
Inspire Record 44241 DOI 10.17182/hepdata.18615
1 data table match query

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ASYMMETRY IN SINGLE pi0 PHOTOPRODUCTION BY POLARIZED gamma RAYS ON PROTONS

Bologna, G. ; Fabbri, F.L. ; Spillantina, P. ; et al.
1970.
Inspire Record 1105046 DOI 10.17182/hepdata.37903
1 data table match query

No description provided.


The polarization of the proton from the process γ+p→p+$\pi^{0}$ in the region of the higher resonances

Querzoli, R. ; Salvini, G. ; Silverman, A. ;
Nuovo Cim. 19 (1961) 53-76, 1961.
Inspire Record 1185001 DOI 10.17182/hepdata.37767

The polarization of the recoil proton in the photoproduction process γ+p→p+π0 has been measured with the beam of the Frascati electrosynchrotron at an angle of 90° in the c.m. system, in the energy interval (500÷900) MeV. A counter technique has been used, and the polarization of the proton was revealed by the left to right asymmetry in the elastic scattering of the protons in a carbon target. The experimental results are given in Table III and in Fig. 10. A definite polarization is found, always of the same sign and equal to −0.4±.14, −0.63±.23, −0.6±.25, −0.57±.12, −0.38±.09, −0.5±.17, −0.5±.22 at the γ-ray energies of 560, 610, 650, 700, 750, 800, 850 MeV respectively. The discussion of these experimental results, together with the data of angular dstributions, allows to conclude that they are in agreement with the hypothesis that the second resonance is a transition (E 1,d 3/2) and the third one is a transition (E 2,f 3/2).

1 data table match query

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Polarization of the recoil proton from the process gamma n ---> p pi- in deuterium for (theta pi)c.m.=90 degrees in the second-resonance region

Beneventano, M. ; D' Angelo, S. ; De Notaristefani, F. ; et al.
Lett.Nuovo Cim. 3S1 (1970) 840-844, 1970.
Inspire Record 64710 DOI 10.17182/hepdata.37344
1 data table match query

No description provided.


Measurement of the polarization of the recoil protons from the reaction $\gamma + \rho \rightarrow \rho + \pi^0$ in the region of the second resonance at low pion center of mass angles

Trines, Dieter ; Althoff, K.H. ;
PhD Thesis, Bonn U., Math. Inst., 1972.
Inspire Record 1396209 DOI 10.17182/hepdata.37154
1 data table match query

No description provided.


Measurement of the Polarization Parameter in $\pi^- p$ Scattering at 291.5-{MeV} and 308-{MeV}

Alder, J.C. ; Perroud, J.P. ; Tran, M.T. ; et al.
Lett.Nuovo Cim. 23 (1978) 381, 1978.
Inspire Record 130236 DOI 10.17182/hepdata.37401
2 data tables match query

No description provided.

No description provided.


Asymmetry Measurements for $\pi^0$ and $\pi^+$ Photoproduction by Linearly Polarized $\gamma$ Rays in the Energy Range 400-{MeV} - 900-{MeV}

Zdarko, R.W. ; Dally, E.B. ;
Nuovo Cim.A 10 (1972) 10, 1972.
Inspire Record 74908 DOI 10.17182/hepdata.37786

The asymmetry ratioA = (σ⊥ -σ∥)/(σ⊥ +σ∥) has been measured by means of linearly polarized γ-rays for π0 and π+ photoproduction. For the reaction γ + p → n + π+, measurements were taken for θc.m. = 135° at γ-ray energies ranging from 390 to 909 MeV. For the reaction γ + p → p + π0, measurements were taken for θc.m. = 60° and 90° at γ-ray energies ranging from 426 to 918 Mev.

2 data tables match query

No description provided.

No description provided.