Calculation of spin-density matrix by diagrammatic perturbation theory

1985 ◽  
Vol 35 (10) ◽  
pp. 1138-1145
Author(s):  
S. Biskupič ◽  
V. Kvasnička
Keyword(s):  
Perturbation Theory ◽  
Density Matrix ◽  
Spin Density ◽  
Spin Density Matrix ◽  
Diagrammatic Perturbation Theory

Measurement of the spin density matrix of D∗ mesons produced in e+e− annihilations

1987 ◽  
Vol 199 (4) ◽  
pp. 585-590 ◽  
Author(s):  
S. Abachi ◽  
C. Akerlof ◽  
P. Baringer ◽  
D. Blockus ◽  
B. Brabson ◽  
...  
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
D Mesons ◽  
Spin Density Matrix

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.

Measurability of the spin density matrix

1968 ◽  
Vol 49 (3) ◽  
pp. 393-402 ◽  
Author(s):  
Roger G Newton ◽  
Bing-lin Young
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Spin Density Matrix

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 Measurement of spin-density matrix elements forϕ-meson photoproduction from protons and deuterons near threshold

2010 ◽  
Vol 82 (1) ◽  
Author(s):  
W. C. Chang ◽  
D. S. Ahn ◽  
J. K. Ahn ◽  
H. Akimune ◽  
Y. Asano ◽  
...  
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Spin Density Matrix ◽  
Matrix Elements ◽  
Meson Photoproduction ◽  
Near Threshold

Drell-Yan representation for vector-meson spin-density matrix elements in semi-inclusive electroproduction

JETP Letters ◽  
2002 ◽  
Vol 76 (3) ◽  
pp. 119-126
Author(s):  
G. I. Gakh ◽  
N. P. Merenkov
Keyword(s):  
Density Matrix ◽  
Vector Meson ◽  
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

Spin-Density-Matrix Analysis. Positivity Conditions and Eberhard-Good Theorem

1966 ◽  
Vol 151 (4) ◽  
pp. 1306-1318 ◽  
Author(s):  
Pierre Minnaert
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Matrix Analysis ◽  
Spin Density Matrix

scholarly journals Measurement of the spin-density matrix elements in exclusive electroproduction of $\rho^0$ mesons at HERA

2000 ◽  
Vol 12 (3) ◽  
pp. 393-410 ◽  
Author(s):  
J. Breitweg et al. ◽  
Keyword(s):  
Density Matrix ◽  
Spin Density ◽  
Spin Density Matrix ◽  
Matrix Elements
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