scholarly journals POLARIZATION OBSERVABLES FROM THE PHOTOPRODUCTION OF ω-MESONS USING LINEARLY POLARIZED PHOTONS

2014 ◽  
Vol 26 ◽  
pp. 1460103
Author(s):  
◽  
DANNY MARTINEZ ◽  
PHILIP L. COLE
Keyword(s):  
Density Matrix ◽  
Energy Region ◽  
Spin Density Matrix ◽  
Angular Distributions ◽  
Matrix Elements ◽  
Meson Photoproduction ◽  
Beam Asymmetry ◽  
Linearly Polarized ◽  
Polarization Observables ◽  
Polarized Photons

We report on the extraction of Polarization Observables Spin Density Matrix Elements (SDMEs), and Beam Asymmetry Σ for ω meson photoproduction using a beam of linearly polarized photons in the photon energy region of Eγ = 1.3 to 1.7 GeV, by means of the angular distributions of the daughter pions from ω decay. These preliminary results are from the g8b dataset, which were collected with the CLAS detector in Hall B of Jefferson Lab.

scholarly journals Spin Density Matrix Elements in Exclusive Production of Omega Mesons at HERMES

2016 ◽  
Vol 40 ◽  
pp. 1660063
Author(s):  
Hrachya Marukyan
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Cross Section ◽  
Transverse Cross Section ◽  
Spin Density Matrix ◽  
Pion Pole ◽  
Matrix Elements ◽  
Unnatural Parity ◽  
Proton Data ◽  
Parity Exchange

Exclusive electroproduction of [Formula: see text] mesons on unpolarized hydrogen and deuterium targets is studied at HERMES in the kinematic region of [Formula: see text], [Formula: see text], and [Formula: see text]. The data were accumulated during the 1996-2007 running period using the [Formula: see text] longitudinally polarized electron or positron beams at HERA. The determination of the virtual-photon longitudinal-to-transverse cross-section ratio shows that a considerable part of the cross section arises from transversely polarized photons. Spin density matrix elements are derived and presented in projections of [Formula: see text] or [Formula: see text]. Violation of s-channel helicity conservation is observed for some of these elements. A sizable contribution from unnatural-parity-exchange amplitudes is found and the phase shift between those amplitudes that describe transverse [Formula: see text] production by longitudinal and transverse virtual photons is determined for the first time. Good agreement is found between the HERMES proton data and results of a pQCD-inspired phenomenological model that includes pion-pole contributions.

Study of charged-pseudoscalar-meson photoproduction from hydrogen and deuterium with 16-GeV linearly polarized photons

1979 ◽  
Vol 20 (7) ◽  
pp. 1553-1583 ◽  
Author(s):  
D. J. Quinn ◽  
J. P. Rutherford ◽  
M. A. Shupe ◽  
D. J. Sherden ◽  
R. H. Siemann ◽  
...  
Keyword(s):  
Pseudoscalar Meson ◽  
Meson Photoproduction ◽  
Linearly Polarized ◽  
Polarized Photons

Spin-Density Matrix Elements and Regge Cuts

1970 ◽  
Vol 1 (6) ◽  
pp. 1847-1848
Author(s):  
Robert L. Thews
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Spin Density Matrix ◽  
Matrix Elements

scholarly journals Spin density matrix elements in exclusive ρ 0 electroproduction on 1H and 2H targets at 27.5 GeV beam energy

2009 ◽  
Vol 62 (4) ◽  
pp. 659-695 ◽  
Author(s):  
A. Airapetian ◽  
◽  
N. Akopov ◽  
Z. Akopov ◽  
A. Andrus ◽  
...  
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Beam Energy ◽  
Spin Density Matrix ◽  
Matrix Elements
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