scholarly journals MEASUREMENT OF NUCLEON--NUCLEON TOTAL CROSS SECTION RATIOS AT ISABELLE.

1971 ◽  
Author(s):  
K. Goulianos
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Nucleon Nucleon

scholarly journals ISOSPIN DEPENDENCE OF THE η' MESON PRODUCTION IN NUCLEON-NUCLEON COLLISIONS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 458-461
Author(s):  
◽  
J. PRZERWA ◽  
P. MOSKAL ◽  
A. BUDZANOWSKI ◽  
E. CZERWIŃSKI ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Total Cross Section ◽  
Cross Section ◽  
Meson Production ◽  
Nucleon Nucleon ◽  
Preliminary Results ◽  
Isospin Dependence ◽  
Insight Into

A comparison of the close–to–threshold total cross section for the η' production in pp → ppη' and pn → pnη' reactions constitutes a tool to investigate the η' meson structure and the reaction mechanism in the channels of isospin I = 0 and I = 1 and may provide insight into the flavour-singlet (perhaps also into gluonium) content of the η' meson. In this contribution we present preliminary results of measurement of the quasi-free production of the η' meson in the proton-neutron collisions conducted using the COSY-11 facility.

A GLOBAL TEST OF FACTORIZATION FOR NUCLEON–NUCLEON, γp AND γγ SCATTERING

2005 ◽  
Vol 20 (13) ◽  
pp. 2781-2793 ◽  
Author(s):  
MARTIN M. BLOCK ◽  
KYUNGSIK KANG
Keyword(s):  
Total Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Nucleon Nucleon ◽  
Vector Meson Dominance ◽  
Global Test ◽  
Section Data ◽  
Energy Domain ◽  
The Cross ◽  
Factorization Relation

The purpose of this paper is to show that the cross-section factorization relation σnn(s)/σγp(s) = σγp(s)/σγγ(s) is satisfied experimentally in the energy domain [Formula: see text], where the σ's are total cross-sections and nn denotes the even portion of the pp and [Formula: see text] total cross-section. A convenient phenomenological parametrization for a global simultaneous fit to the pp, [Formula: see text], γp and γγ total cross-section data together with the ρ-value data for pp and [Formula: see text] is provided by using real analytic amplitudes. Within experimental errors, we show that factorization is satisfied when we unfold the published γγ data which had averaged the cross-sections obtained by using the two different PHOJET and PYTHIA Monte Carlo results. Our analysis clearly favors the PHOJET results and suggests that the additive quark model, together with vector meson dominance, allows one to compute σγp(s) and σγγ(s) from σnn(s) with essentially no free parameters. The universal ρ-value predicted by our fit, i.e. ρnn = ργp = ργγ, is compared to the ρ-value obtained by a QCD-inspired analysis of [Formula: see text] and pp data, including the p-air cross-sections from cosmic rays. The ρ-values obtained from the two techniques are essentially indistinguishable in the energy region [Formula: see text], giving us increased confidence in our parametrization of the cross-sections needed for the factorization relation.

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