Klimenko, S.G.
Polarization
[1.0, 2.0]
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Deeply virtual and exclusive electroproduction of omega mesons.

The CLAS collaboration Morand, L. ; Dore, D. ; Garcon, M. ; et al.
Eur.Phys.J.A 24 (2005) 445-458, 2005.
Inspire Record 681604 DOI 10.17182/hepdata.43499

The exclusive omega electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross sections were measured up to large values of the four-momentum transfer (-t < 2.7 GeV2) to the proton. The contributions of the interference terms sigma_TT and sigma_TL to the cross sections, as well as an analysis of the omega spin density matrix, indicate that helicity is not conserved in this process. The t-channel pi0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction gamma* p -> omega p, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.

85 data tables
Table 1

Total cross sections and interference terms (TT and TL).

Table 2

Differential cross sections DSIG/DT for Q**2 = 1.725 GeV**2 and W = 2.77 GeV.

Table 3

Differential cross sections DSIG/DT for Q**2 = 1.752 GeV**2 and W = 2.48 GeV.

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POLARIZATION OF RECOIL PROTONS FROM THE REACTION GAMMA P ---> PI0 P IN THE PHOTON ENERGY RANGE 450-MEV - 800-MEV

Bratashevsky, A.S. ; Gorbenko, V.G. ; Derebchinsky, A.I. ; et al.
Nucl.Phys.B 166 (1980) 525-533, 1980.
Inspire Record 157933 DOI 10.17182/hepdata.34552

Measurement of secondary-proton polarization from the reaction γ p → π 0 p have been performed in the proton energy range 500–800 MeV at c.m. pion emission angles 100°, 120°, 140°. The experiment was carried out using an optical spark chamber telescope at the output of the magnetic spectrometer. The obtained experimental data are included in a Walker-type analysis in order to verify the parameters of the resonances P 11 (1470), D 13 (1570) and S 11 (1535). Proton polarization in the reaction γ p → π 0 p was measured for a photon energy of 450 MeV at a c.m. pion emission angle of 105° using photons linearly polarized at 45° to the reaction plane. A liquid hydrogen target in the field of a superconducting magnet was used for the separation of the P x ′ and P z ′ components of the secondary-proton polarization vector.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Angular Dependence of Polarization of Secondary Protons from the Reaction gamma p --> pi0 p at Photon Energies of 650-MeV and 700-MeV

Zybalov, A.A ; Derebchinsky, A.I. ; Konovalov, O.G. ; et al.
Yad.Fiz. 28 (1978) 105-107, 1978.
Inspire Record 135481 DOI 10.17182/hepdata.18990

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Proton Polarization in gamma p --> pi0 p Reaction at an Angle of Theta (pi) = 100-Degrees in CMS in the Second pi n Resonance Region

Derebchinsky, A.I. ; Zybalov, A.A ; Konovalov, O.G. ; et al.
Yad.Fiz. 28 (1978) 265-266, 1978.
Inspire Record 135482 DOI 10.17182/hepdata.19013

None

1 data table
Table 1

No description provided.


Polarization of secondary protons from the gamma + p ---> pi0 + p reaction in the third resonance region

Derebchinskii, A.I. ; Tonapetyan, S.G. ; Konovalov, O.G. ; et al.
Zh.Eksp.Teor.Fiz. 66 (1974) 68-73, 1974.
Inspire Record 96653 DOI 10.17182/hepdata.39968

None

1 data table
Table 1

No description provided.


Polarization of protons produced in the gamma p ---> pi0 p reaction by 692-1028 mev photons at an angle of 90 degrees in the c.m.s

Goncharov, N.V. ; Derebchinskii, A.I. ; Zybalov, A.A. ; et al.
Zh.Eksp.Teor.Fiz. 64 (1973) 401-406, 1973.
Inspire Record 87241 DOI 10.17182/hepdata.39909

None

1 data table
Table 1

No description provided.


Investigation of polarization of the photoprotons from the c-12 nucleus at the gamma-quanta energy of 550-715 mev

Goncharov, N.V. ; Derebchinskii, A.I. ; Zybalov, A.A. ; et al.
Yad.Fiz. 14 (1971) 673-675, 1971.
Inspire Record 69410 DOI 10.17182/hepdata.19273

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.