Isobar formalism and one-pion-exchange partial-wave cross sections inπN→ππN

1977 ◽  
Vol 16 (1) ◽  
pp. 50-61 ◽  
Author(s):  
Ronald Aaron ◽  
R. D. Amado ◽  
Richard A. Arndt ◽  
Yogesh Goradia ◽  
Doris C. Teplitz ◽  
...  
Keyword(s):  
Partial Wave ◽  
Cross Sections ◽  
Pion Exchange

scholarly journals Resonant states 0+ of the Boron isotope 8B from the Jost-matrix analysis of the partial cross-sections

2019 ◽  
Vol 28 (10) ◽  
pp. 1950083
Author(s):  
S. A. Rakityansky ◽  
S. N. Ershov ◽  
T. J. Tshipi
Keyword(s):  
Experimental Data ◽  
Riemann Surface ◽  
Partial Wave ◽  
Coulomb Interaction ◽  
Cross Sections ◽  
Matrix Analysis ◽  
Analytic Structure ◽  
Square Root ◽  
Excitation Energies ◽  
Resonant States

The available [Formula: see text]-matrix parametrization of experimental data on the excitation functions for the elastic and inelastic [Formula: see text] scattering at the collision energies up to 3.4[Formula: see text]MeV is used to generate the corresponding partial-wave cross-sections in the states with [Formula: see text]. Thus, obtained data are fitted using the semi-analytic two-channel Jost matrix with a proper analytic structure and some adjustable parameters. Then the spectral points are sought as zeros of the Jost matrix determinant (which correspond to the [Formula: see text]-matrix poles) at complex energies. The correct analytic structure makes it possible to calculate the fitted Jost matrix on any sheet of the Riemann surface whose topology involves not only the square-root but also the logarithmic branching caused by the Coulomb interaction. In this way, two overlapping [Formula: see text] resonances at the excitation energies [Formula: see text] and [Formula: see text][Formula: see text]MeV have been found.

TO SEARCH FOR THE EXOTIC TENSOR MESON IN THE ρ+ρ+ AND ρ−ρ− CHANNELS IN HADRON COLLISIONS AT INTERMEDIATE ENERGIES

1992 ◽  
Vol 07 (18) ◽  
pp. 4313-4333 ◽  
Author(s):  
N.N. ACHASOV ◽  
G.N. SHESTAKOV
Keyword(s):  
Cross Sections ◽  
Central Region ◽  
Meson Production ◽  
Pion Exchange ◽  
Exchange Reactions ◽  
Resonance States ◽  
Tensor Meson ◽  
Intermediate Energies ◽  
The Cross

It is shown that reactions with one-pion exchange, reactions of meson production in the central region and reactions of nucleon-antinucleon annihilation can be good laboratories to search, in the ρ+ρ+ and ρ−ρ−channels, for the exotic resonance states E++ and E−− with IG(JP)=2+(2+), the signs of the neutral partner of which were discovered probably in the reactions γγ→ρρ. Detailed estimates are presented for the cross sections of the reactions π+p→E++n→ρ+ρ+n, π−ρ→E−−Δ++→ρ−ρ−∆++, ρρ→n(E++)n→n(ρ+ρ+)n and similar ones at intermediate energies.

Measurement and pion exchange analysis of the inclusive spectra np→pX0 between 1.4 and 1.9 GeV/c and determination of the differential cross sections np→pΔ330

1976 ◽  
Vol 108 (2) ◽  
pp. 189-213 ◽  
Author(s):  
G. Bizard ◽  
F. Bonthonneau ◽  
J.L. Laville ◽  
F. Lefebvres ◽  
J.C. Malherbe ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Pion Exchange ◽  
Differential Cross Sections

scholarly journals Partial Wave Analysis of the l8O(p, a0)15N Reaction

1979 ◽  
Vol 32 (3) ◽  
pp. 187 ◽  
Author(s):  
LWJ Wild ◽  
BM Spicer
Keyword(s):  
Least Squares ◽  
Partial Wave ◽  
Cross Sections ◽  
Differential Cross ◽  
Partial Wave Analysis ◽  
Differential Cross Sections ◽  
Wave Analysis ◽  
Least Squares Fitting ◽  
Analytic Expression ◽  
Bombarding Energy

A partial wave analysis of the differential cross sections for the 180(p,OCO)15N reaction has been carried out by applying the formalism of .Blatt and Biedenharn (1952), made specific for this reaction. The differential cross sections, measured at 200 keV intervals from 6�6 to 10�4 MeV bombarding energy, were subjected to least-squares fitting to this specific analytic expression. Two resonances were given by the analysis, the 19p states being at 14�71 �0�07 MeV (1/2-) and 14�80�0�07 MeV (1/2 +).

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