scholarly journals Search for the Charge Symmetry Forbidden Decays of Electron--Positron Bound State Using the J-PET Detector

2020 ◽  
Vol 51 (1) ◽  
pp. 365
Author(s):  
J. Chhokar
Keyword(s):  
Bound State ◽  
Charge Symmetry ◽  
Electron Positron

scholarly journals The influence of small-scale magnetic field on the heating of J0250+5854 polar cap

2021 ◽  
Vol 2103 (1) ◽  
pp. 012034
Author(s):  
D P Barsukov ◽  
A A Matevosyan ◽  
I K Morozov ◽  
A N Popov ◽  
M V Vorontsov
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Bound State ◽  
Small Scale ◽  
Polar Cap ◽  
Electron Positron ◽  
Curvature Radiation ◽  
Cap Model ◽  
Star Surface ◽  
Primary Electrons

Abstract The influence of surface small-scale magnetic field on the heating of PSR J0250+5854 polar cap is considered. It is assumed that the polar cap is heated only by reverse positrons accelerated in pulsar diode. It is supposed that pulsar diode is located near the star surface (polar cap model) and operates in the steady state space charge-limited flow regime. The reverse positron current is calculated in the framework of two models: rapid and gradually screening. To calculate the production rate of electron-positron pairs we take into account only the curvature radiation of primary electrons and its absorption in magnetic field. It is assumed that some fraction of electron-positron pairs may be created in bound state that can later be photoionized by thermal photons from star surface.

Concept of an Electron–Positron Collider for Production and Study of the (μ+μ–) Bound State

2018 ◽  
Vol 15 (7) ◽  
pp. 740-744
Author(s):  
A. V. Bogomyagkov ◽  
V. P. Druzhinin ◽  
E. B. Levichev ◽  
A. I. Mil’shtein ◽  
S. V. Sinyatkin
Keyword(s):  
Bound State ◽  
Electron Positron

The Hydrogen Atom and Positronium

2019 ◽  
pp. 43-54
Author(s):  
Michael E. Peskin
Keyword(s):  
Fine Structure ◽  
Hydrogen Atom ◽  
Hyperfine Structure ◽  
Energy Levels ◽  
Bound State ◽  
Electron Positron

This chapter discusses the physics of the hydrogen atom and the electron-positron bound state positronium. It describes the energy levels of these atoms, including the fine structure and hyperfine structure. It discusses the lifetimes of the two species of positronium.

scholarly journals Sensitivity of Discrete Symmetry Tests in the Positronium System with the J-PET Detector

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1268
Author(s):  
Aleksander Gajos
Keyword(s):  
Detection System ◽  
Discrete Symmetry ◽  
Bound State ◽  
Emission Tomography ◽  
Angular Correlations ◽  
Leptonic Sector ◽  
Positron Emission ◽  
Electron Positron ◽  
Order Of Magnitude ◽  
Symmetry Tests

Study of certain angular correlations in the three-photon annihilations of the triplet state of positronium, the electron–positron bound state, may be used as a probe of potential CP and CPT-violating effects in the leptonic sector. We present the perspectives of CP and CPT tests using this process recorded with a novel detection system for photons in the positron annihilation energy range, the Jagiellonian Positron Emission Tomography (J-PET). We demonstrate the capability of this system to register three-photon annihilations with an unprecedented range of kinematical configurations and to measure the CPT-odd correlation between positronium spin and annihilation plane orientation with a precision improved by at least an order of magnitude with respect to present results. We also discuss the means to control and reduce detector asymmetries in order to allow J-PET to set the first measurement of the correlation between positronium spin and momentum of the most energetic annihilation photon which has never been studied to date.

scholarly journals Search for bound-state electron+positron pair decay

2016 ◽  
Vol 123 ◽  
pp. 04003 ◽  
Author(s):  
F. Bosch ◽  
S. Hagmann ◽  
P.-M. Hillenbrand ◽  
G. J. Lane ◽  
Yu. A. Litvinov ◽  
...  
Keyword(s):  
Bound State ◽  
State Electron ◽  
Electron Positron ◽  
Electron Positron Pair

The Gluon

2019 ◽  
pp. 149-168
Author(s):  
Michael E. Peskin
Keyword(s):  
Positron Annihilation ◽  
Parton Distribution ◽  
Bound State ◽  
Distribution Functions ◽  
Strong Interactions ◽  
Parton Distribution Functions ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Event Shapes

This chapter describes the description of the proton as a bound state of partons. After a review of the properties of parton distribution functions, it introduces the evidence for a component of the proton responsible for its binding. It introduces the model of strong interactions as mediated by a spin 1 gluon and presents the evidence for this model from event shapes in electron-positron annihilation to hadrons.

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.

Electron-positron scaling in bound state models

1977 ◽  
Vol 120 (1) ◽  
pp. 113-124 ◽  
Author(s):  
M. Böhm ◽  
M. Krammer
Keyword(s):  
Bound State ◽  
Electron Positron ◽  
State Models

QUASI-POSITRONIUM IN METALS

1964 ◽  
Vol 42 (10) ◽  
pp. 1908-1913 ◽  
Author(s):  
A. Held ◽  
S. Kahana
Keyword(s):  
Positron Annihilation ◽  
Basic Equation ◽  
Schrodinger Equation ◽  
Bound State ◽  
The State ◽  
Low Density ◽  
Electron Gases ◽  
Electron Positron ◽  
Electron Positron Pair ◽  
Quasi Bound State

A variational search is made for a quasi-bound state of an electron–positron pair in a metal. The basic equation used is the effective Schrödinger equation derived from the electron–positron propagator in an approximation which accurately accounts for the two-body correlations. It is found that no such state exists in metals and hence it can have no influence on the positron annihilation rates. However, the state appears for electron gases of sufficiently low density, [Formula: see text],* and thus determines the low-density annihilation rates.

Sign in / Sign up

Export Citation Format

Share Document