scholarly journals BURSTS OF LOW-ENERGY ELECTRON–POSITRON PAIRS IN TeV-RANGE COLLIDER PHYSICS

2009 ◽  
Vol 24 (24) ◽  
pp. 1937-1942 ◽  
Author(s):  
FRANCESCO GIACOSA ◽  
RALF HOFMANN
Keyword(s):  
Weak Interactions ◽  
Large Fraction ◽  
High Energy ◽  
Low Energy ◽  
Energy Electron ◽  
Large Defect ◽  
Electron Neutrinos ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Low Energy Electron

In this letter we investigate the possible emission of low-energy electron neutrinos and electron–positron pairs of anomalously large multiplicity in close-to-central pp collisions at LHC. The scenario is based on confining SU(2) Yang–Mills dynamics of Hagedorn temperature ~ me = 511 keV being responsible for the emergence of the lightest lepton family and the weak interactions of the Standard Model. Although cut off by LHC's detectors these electron–positron bursts would be seen indirectly by a large defect energy and thus an anomalously strong decrease of events with interesting high-energy secondaries for increasing [Formula: see text]. This is because the formation of superconducting (preconfining) SU(2) hot-spots "steals" a large fraction of [Formula: see text] subsequently transferring it to a thermal spectrum of electron neutrinos, electrons, and positrons liberated through evaporation. We thus propose the detection of electrons and positrons of kinetic energy ~ me and photons of energy ~ 2me.

A COMPARISON OF ANGULAR BEHAVIORS AMONG ELECTRON AND POSITRON SCATTERING FACTORS

2000 ◽  
Vol 07 (03) ◽  
pp. 333-345 ◽  
Author(s):  
S. Y. TONG ◽  
C. W. MOK
Keyword(s):  
Wave Front ◽  
Low Energy ◽  
Energy Electron ◽  
Resonance States ◽  
Positron Scattering ◽  
Angular Momenta ◽  
Electrons And Positrons ◽  
Low Energy Electron

In this review, we discuss the angular anisotropies in the scattering factors of electrons and positrons for scattering by atoms in solids. We show that, as a function of the angle, the maximum number of dips in the scattering factor's magnitude and jumps of near π in its phase are related to the angular momenta of the bound and resonance states of the potential. The effect of the scattering factor's anisotropies on low-energy electron and positron holographic wave-front reconstruction is discussed.

scholarly journals Low-energy electron-positron collider to search and study (μ+μ−) bound state

2018 ◽  
Vol 181 ◽  
pp. 01032 ◽  
Author(s):  
Anton Bogomyagkov ◽  
Vladimir Druzhinin ◽  
Eugene Levichev ◽  
Alexander Milstein ◽  
Sergej Sinyatkin
Keyword(s):  
Energy Range ◽  
Beam Energy ◽  
Bound State ◽  
Low Energy ◽  
Energy Electron ◽  
High Luminosity ◽  
Effective Suppression ◽  
Electron Positron ◽  
Zero Momentum ◽  
Low Energy Electron

We discuss a low energy e+e− collider for production of the not yet observed (μ+μ−) bound system (dimuonium). Collider with large crossing angle for e+e− beams intersection produces dimuonium with non-zero momentum; therefore, its decay point is shifted from the beam collision area providing effective suppression of the elastic e+e− scattering background. The experimental constraints define subsequent collider specifications. We show preliminary layout of the accelerator and obtained main parameters. High luminosity in chosen beam energy range allows to study π± and η-mesons.

scholarly journals First observation of low energy electron neutrinos in a liquid argon time projection chamber

2017 ◽  
Vol 95 (7) ◽  
Author(s):  
R. Acciarri ◽  
C. Adams ◽  
J. Asaadi ◽  
B. Baller ◽  
T. Bolton ◽  
...  
Keyword(s):  
Time Projection Chamber ◽  
Liquid Argon ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Neutrinos ◽  
Low Energy Electron ◽  
Time Projection

Microprobe AES Combined With Scanning RHEED Microscope

1990 ◽  
Vol 48 (2) ◽  
pp. 368-369
Author(s):  
Y. Sakai ◽  
S. Kitamura ◽  
A. D. Buonaquisti
Keyword(s):  
Electron Microscopy ◽  
Electron Diffraction ◽  
High Energy ◽  
Low Energy ◽  
Energy Electron ◽  
Diffraction Spot ◽  
High Energy Electron ◽  
Micro Structure ◽  
Fluorescent Screen ◽  
Low Energy Electron

Surface micro-structure analysis is very important for surface study in material science. Observations of surface atomic steps and reconstructed structures have been made using several techniques: reflection high energy electron microscopy (RHEEM), low energy electron reflection microscopy (LEERM) and low energy electron diffraction microscopy (LEEDM).In the present experiment, observations of surface micro-structures have been made using a scanning type reflection high energy electron diffraction (RHEED) microscopy. This technique has certain advantages of easy combinations with multiple surface analyzing techniques such as scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and electron energy loss spectroscopy (ELS).A schematic diagram of the scanning RHEED microscope combined with the microprobe AES is shown in Fig. 1. RHEED patterns are observed on the fluorescent screen through a viewing port. To observe the micro-structure (scanning RHEED image or dark field image), a particular diffraction spot is selected by means of the other small fluorescent screen with an aperture.

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