Asymptotic correlations between total cross-sections and forward scattering amplitudes

1976 ◽  
Vol 26 (1) ◽  
pp. 86-91 ◽  
Author(s):  
J. Fischer ◽  
P. Kolář ◽  
I. Vrkoč
Keyword(s):  
Scattering Amplitudes ◽  
Cross Sections ◽  
Forward Scattering ◽  
Total Cross Sections ◽  
Asymptotic Correlations

scholarly journals Light-by-light forward scattering amplitudes in Lattice QCD

2018 ◽  
Vol 175 ◽  
pp. 06030
Author(s):  
Antoine Gérardin ◽  
Jeremy Green ◽  
Oleksii Gryniuk ◽  
Georg von Hippel ◽  
Harvey B. Meyer ◽  
...  
Keyword(s):  
Scattering Amplitudes ◽  
Lattice Qcd ◽  
Cross Sections ◽  
Correlation Functions ◽  
Sum Rules ◽  
Form Factors ◽  
Forward Scattering ◽  
Meson Pole ◽  
Point Correlation ◽  
Dispersive Approach

We present our preliminary results on the calculation of hadronic light-by-light forward scattering amplitudes using vector four-point correlation functions computed on the lattice. Using a dispersive approach, forward scattering amplitudes can be described by γ*γ* → hadrons fusion cross sections and then compared with phenomenology. We show that only a few states are needed to reproduce our data. In particular, the sum rules considered in this study imply relations between meson–γγ couplings and provide valuable information about individual form factors which are often used to estimate the meson-pole contributions to the hadronic light-by-light contribution to the (g – 2) of the muon.

Total cross sections, real part of the amplitude, and slope of diffraction cones of the pp and �pp forward scattering

1990 ◽  
Vol 33 (5) ◽  
pp. 436-440
Author(s):  
G. G. Arushanov ◽  
E. I. Iv ◽  
I. M. Kirson ◽  
M. S. Yakubov
Keyword(s):  
Cross Sections ◽  
Forward Scattering ◽  
Total Cross Sections

Neutron Total Cross-Sections at 18.8 eV

1974 ◽  
Vol 29 (12) ◽  
pp. 1750-1753 ◽  
Author(s):  
W. Dilg
Keyword(s):  
Experimental Data ◽  
Scattering Amplitudes ◽  
Neutron Scattering ◽  
Neutron Energy ◽  
Cross Sections ◽  
Total Cross Sections ◽  
Neutron Transmission ◽  
Spin Dependent Scattering ◽  
Transmission Measurements ◽  
Scattering Cross Sections

Neutron transmission measurements were performed at 18.8 eV neutron energy on F, Al, Sc, V, Fe, Co, Cu, Zn and Nb, in order to acurately determine the "free" scattering cross-sections of these elements. Coherent neutron scattering amplitudes are derived for F, AI, Sc, Fe, Cu, Zn and Nb, using available experimental data of the isotopic and spin-incoherent cross-sections. Spin-dependent scattering amplitudes a(l+½) and a(l-½) are evaluated for the monoisotopes F, Al, Sc, V, Co and Nb.

scholarly journals Implications of the ρ(s) measurements by TOTEM at the LHC

2018 ◽  
Vol 33 (35) ◽  
pp. 1850206 ◽  
Author(s):  
S. M. Troshin ◽  
N. E. Tyurin
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
Forward Scattering ◽  
Elastic Amplitude ◽  
Total Cross Sections ◽  
The Real

Implications of the recent measurements of the parameter [Formula: see text] (ratio of the real to imaginary parts of the forward scattering elastic amplitude) by TOTEM collaboration at [Formula: see text] = 13 TeV are discussed with emphasis on the rising energy dependence of the ratio of elastic to total cross-sections.

Analysis of STEM micrographs of thick objects

1978 ◽  
Vol 36 (2) ◽  
pp. 106-107
Author(s):  
S. Golladay
Keyword(s):  
Inelastic Scattering ◽  
Multiple Scattering ◽  
Mass Distribution ◽  
Cross Sections ◽  
Phase Contrast ◽  
Image Point ◽  
Contrast Effects ◽  
Total Cross Sections ◽  
Elastic And Inelastic Scattering

The theory of multiple scattering has been worked out by Groves and comparisons have been made between predicted and observed signals for thick specimens observed in a STEM under conditions where phase contrast effects are unimportant. Independent measurements of the collection efficiencies of the two STEM detectors, calculations of the ratio σe/σi = R, where σe, σi are the total cross sections for elastic and inelastic scattering respectively, and a model of the unknown mass distribution are needed for these comparisons. In this paper an extension of this work will be described which allows the determination of the required efficiencies, R, and the unknown mass distribution from the data without additional measurements or models. Essential to the analysis is the fact that in a STEM two or more signal measurements can be made simultaneously at each image point.

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