π-Meson-Elektron-Streuung und Struktur des π-Mesons

1960 ◽  
Vol 15 (12) ◽  
pp. 1023-1030 ◽  
Author(s):  
H. Salecker
Keyword(s):  
Form Factor ◽  
Cross Sections ◽  
High Energy ◽  
Electromagnetic Structure ◽  
Electron Positron ◽  
Pair Annihilation ◽  
Very High Energy ◽  
Scattering Cross Sections ◽  
Electron Positron Pair ◽  
Very High

In this article we propose π-meson-electron scattering as a possibility for investigating the electromagnetic structure of the pion. This experiment requires very high energy, but not necessarily such a high accuracy as the extrapolation procedure of CHEW and Low. After a short discussion of the general properties of the electromagnetic formfactor of the π-meson, we calculate the π—e and the e—π scattering cross sections with form factor. With an energy of 25 GeV and a 10% experimental error we can probe the root mean square radius of the pion down to 0.8 10-13 cm, with 50 GeV down to 0.6·10-13 cm and with 100 GeV to 0.36·10-13 cm. The rms radius of the pion may be larger than previously assumed, because there exists the possibility of a fairly large π — π interaction. A complementary possibility for investigating the electromagnetic structure of the pion consists in electron-positron pair annihilation with the creation of a π± pair. This process will probe the form factor of the π-meson for timelike arguments.

scholarly journals VERY HIGH ENERGY GAMMA RAYS FROM e± PAIR HALOS

2009 ◽  
Vol 18 (06) ◽  
pp. 911-927 ◽  
Author(s):  
A. EUNGWANICHAYAPANT ◽  
F. AHARONIAN
Keyword(s):  
Energy Spectrum ◽  
Gamma Rays ◽  
High Energy ◽  
Angular Distributions ◽  
Extragalactic Background Light ◽  
Electron Positron ◽  
Very High Energy ◽  
Energy Gamma ◽  
Electron Positron Pair ◽  
Very High

In this paper we study the formation of giant electron–positron pair halos around the powerful high energy extragalactic sources. We investigate the dependence of radiation of pair halos, in particular the spectral and angular distributions on the energy spectrum of the primary gamma rays, the redshift of the source, and the flux of the extragalactic background light.

scholarly journals Highest energy proton–nucleus cross-sections

2018 ◽  
Vol 33 (40) ◽  
pp. 1850242 ◽  
Author(s):  
L. Stodolsky
Keyword(s):  
Cosmic Rays ◽  
Cross Sections ◽  
High Energy ◽  
High Energy Proton ◽  
Proton Proton ◽  
Energy Proton ◽  
Black Disc ◽  
Simple Generalization ◽  
Very High Energy ◽  
Very High

The description of very high energy proton–proton cross-sections in terms of a “black disc” with an “edge” allows a simple generalization to highest energy proton–nucleus cross-sections. This results in a leading ln2W term and a ln W term whose coefficient depends linearly on the radius of the nucleus (W the c.m. energy). The necessary parameters are determined from the fits to p–p data. Since the coefficient of the ln W term is rather large, it is doubtful that the regime of ln2W dominance can be reached with available energies in accelerators or cosmic rays. However, the ln W term can be relevant for highest energy cosmic rays in the atmosphere, where a large increase for the cross-section on nitrogen is expected. Tests of the theory should be possible by studying the coefficient of ln W at p-nucleus colliders.

Photonucleon Total Cross Sections at Very High Energy

1970 ◽  
Vol 25 (13) ◽  
pp. 902-902 ◽  
Author(s):  
W. P. Hesse ◽  
D. O. Caldwell ◽  
V. B. Elings ◽  
R. J. Morrison ◽  
F. V. Murphy ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Total Cross Sections ◽  
Very High Energy ◽  
Very High

Measurement ofp−pinclusive cross sections at very high energy

1974 ◽  
Vol 9 (5) ◽  
pp. 1135-1161 ◽  
Author(s):  
L. G. Ratner ◽  
R. J. Ellis ◽  
G. Vannini ◽  
B. A. Babcock ◽  
A. D. Krisch ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Very High Energy ◽  
Very High

R&D PROGRESS TOWARD FUTURE LINEAR COLLIDERS

2000 ◽  
Vol 15 (supp01b) ◽  
pp. 806-815
Author(s):  
GUSTAV-ADOLF VOSS
Keyword(s):  
Peak Power ◽  
Linear Collider ◽  
High Energy ◽  
High Peak Power ◽  
Rf Power ◽  
Electron Positron ◽  
Linear Colliders ◽  
Very High Energy ◽  
Very High ◽  
Low Emittance

During the last twenty years, there has been a world wide effort to develop the physics and technology of linear colliders. Present goals at SLAC, KEK, and DESY are to bring the R&D efforts to the point where proposals for 500/1000 GeV cms electron-positron colliders can be officially submitted in the years 2002/2003. The CLIC study at CERN aims at a second generation very high energy electron-positron collider, to be considered after completion of the LHC. The main areas of hardware R&D include efficient accelerating waveguides without harmful higher order mode (h.o.m.) effects, high peak power klystrons, klystron modulators, and rf-power compression. Test facilities have been put in place for the testing of h.o.m. behavior of new waveguide designs (ASSET), focusing of low emittance beams to spot sizes in the nanometer range (FFTB), and damping particle oscillations in a special damping ring (ATF) to prepare low emittance bunch trains of electrons for injection into linear colliders. The TESLA collaboration is making a major effort to develop the required technology for a superconducting linear collider. Test accelerator sections, which employ all the necessary new accelerator components, have been built and are currently being tested at SLAC and DESY.

R&D PROGRESS TOWARD FUTURE LINEAR COLLIDERS

1999 ◽  
Vol 14 (28) ◽  
pp. 1923-1931
Author(s):  
G.-A. VOSS
Keyword(s):  
Peak Power ◽  
Linear Collider ◽  
High Energy ◽  
High Peak Power ◽  
Rf Power ◽  
Electron Positron ◽  
Linear Colliders ◽  
Very High Energy ◽  
Very High ◽  
Low Emittance

During the last 20 years there has been a worldwide effort to develop the physics and technology of linear colliders. Present goals at SLAC, KEK and DESY are to bring the R&D efforts to the point where proposals for 500/1000 GeV cms electron–positron colliders can be officially submitted in the years 2002/2003. The CLIC study at CERN aims at a second generation very high energy electron–positron collider, to be considered after completion of the LHC. The main areas of hardware R&D include efficient accelerating waveguides without harmful higher order mode (h.o.m) effects, high peak power klystrons, klystron modulators and rf-power compression. Test facilities have been put in place for the testing of h.o.m behavior of new waveguide designs (ASSET), focusing on low emittance beams to spot sizes in the nanometer range (FFTB) and damping particle oscillations in a special damping ring (ATF) to prepare low emittance bunch trains of electrons for injection into linear colliders. The TESLA collaboration is making a major effort to develop the required technology for a superconducting linear collider. Test accelerator sections, which employ all the necessary new accelerator components, have been built and are currently being tested at SLAC and DESY.

Photonucleon Total Cross Sections at Very High Energy.

1970 ◽  
Vol 25 (14) ◽  
pp. 979-979 ◽  
Author(s):  
W. P. Hesse ◽  
D. O. Caldwell ◽  
V. B. Elings ◽  
R. J. Morrison ◽  
F. V. Murphy ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Total Cross Sections ◽  
Very High Energy ◽  
Very High
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