scholarly journals Lorentz and CPT Tests Using Penning Traps

Symmetry ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1220 ◽  
Author(s):  
Yunhua Ding
Keyword(s):  
Quantum Electrodynamics ◽  
Magnetic Moments ◽  
Lorentz Violation ◽  
Experimental Results ◽  
Cpt Violation ◽  
Penning Traps

The theoretical prospects for quantum electrodynamics with Lorentz-violating operators of mass dimensions up to six are revisited in this work. The dominant effects due to Lorentz and CPT violation are studied in measurements of magnetic moments of particles confined in Penning traps. Using recently reported experimental results, new coefficients for Lorentz violation are constrained and existing bounds of various coefficients are improved.

scholarly journals Penning-Trap Searches for Lorentz and CPT Violation

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1703
Author(s):  
Yunhua Ding ◽  
Teague D. Olewiler ◽  
Mohammad Farhan Rawnak
Keyword(s):  
Quantum Electrodynamics ◽  
Recent Progress ◽  
Penning Trap ◽  
Magnetic Moments ◽  
Lorentz Violation ◽  
Cpt Violation ◽  
Penning Traps ◽  
Cpt Symmetry ◽  
Electrons And Positrons ◽  
Mass Ratios

An overview of recent progress on testing Lorentz and CPT symmetry using Penning traps is presented. The theory of quantum electrodynamics with Lorentz-violating operators of mass dimensions up to six is summarized. Dominant shifts in the cyclotron and anomaly frequencies of the confined particles and antiparticles due to Lorentz and CPT violation are derived. Existing results of the comparisons of charge-to-mass ratios and magnetic moments involving protons, antiprotons, electrons, and positrons are used to constrain various coefficients for Lorentz violation.

scholarly journals Overview of the Phenomenology of Lorentz and CPT Violation in Atomic Systems

Symmetry ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1433 ◽  
Author(s):  
Arnaldo J. Vargas
Keyword(s):  
Lorentz Violation ◽  
Atomic Spectroscopy ◽  
Cpt Violation ◽  
Atomic Systems

This is an overview of recent publications on the prospects of searching for nonminimal Lorentz-violating effects in atomic spectroscopy experiments. The article discusses the differences in the signals for Lorentz violation in the presence of minimal and nonminimal operators and what systems are more sensitive to certain types of Lorentz-violating operators.

scholarly journals Photon splitting bound on Lorentz Violation in QED from multi-TeV photon observation.

2018 ◽  
Vol 191 ◽  
pp. 02020
Author(s):  
Konstantin Astapov ◽  
Petr Satunin ◽  
Dmitry Kirpichnikov
Keyword(s):  
Quantum Electrodynamics ◽  
Crab Nebula ◽  
Lorentz Invariance ◽  
Lorentz Violation ◽  
Mass Scale ◽  
Special Model ◽  
Astrophysical Source ◽  
Broken Lorentz Invariance ◽  
Photon Splitting ◽  
The Crab Nebula

We calculate the width of photon splitting to three photons in a special model of quantum electrodynamics with broken Lorentz invariance. This process may lead to a sharp cut-off in a photon spectrum of a given astrophysical source. Analysing experimental data, we set a constraint on Lorentz-violating mass scale from the absence of such cut-off in the Crab Nebula spectrum.

scholarly journals The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results

2007 ◽  
Vol 264 (2-3) ◽  
pp. 110-121 ◽  
Author(s):  
S. George ◽  
K. Blaum ◽  
F. Herfurth ◽  
A. Herlert ◽  
M. Kretzschmar ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Precision ◽  
Experimental Results ◽  
Penning Traps

Temperatur- und Konzentrationsabhängigkeit der 115In-Knightshift im flüssigen In-Mn-System

1990 ◽  
Vol 45 (7) ◽  
pp. 851-856
Author(s):  
I. Senel ◽  
D. Quitmann
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Moments ◽  
Metallic Alloys ◽  
Experimental Results

AbstractNMR measurements of the 115In-Knightshift and the linewidth in liquid In-Mn are reported. They were carried out in an external magnetic field of about 4.0 T at concentrations 0, 3, and 6 at.% Mn at temperatures from 400 K to 1300 K. According to our experimental results there are no localized magnetic moments in the liquid In-Mn-system. The experimental results are discussed in the framework of theories on metallic alloys.

Past, present and future of the muon g-2

2015 ◽  
Vol 39 ◽  
pp. 1560107
Author(s):  
A. E. Dorokhov ◽  
A. E. Radzhabov ◽  
A. S. Zhevlakov
Keyword(s):  
Quantum Electrodynamics ◽  
Particle Physics ◽  
Relativistic Quantum ◽  
Magnetic Moments ◽  
Structure Constant ◽  
New Physics ◽  
Fine Structure Constant ◽  
Measured Quantity ◽  
The Standard Model

The electron and muon anomalous magnetic moments (AMM) are measured in experiments and studied in the Standard Model (SM) with the highest precision accessible in particle physics. The comparison of the measured quantity with the SM prediction for the electron AMM provides the best determination of the fine structure constant. The muon AMM is more sensitive to the appearance of New Physics effects and, at present, there appears to be a three- to four-standard deviation between the SM and experiment. The lepton AMMs are pure relativistic quantum correction effects and therefore test the foundations of relativistic quantum field theory in general, and of quantum electrodynamics (QED) and SM in particular, with highest sensitivity. Special attention is paid to the studies of the hadronic contributions to the muon AMM which constitute the main source of theoretical uncertainties of the SM.

scholarly journals Precision Physics in Penning Traps Using the Continuous Stern-Gerlach Effect

2021 ◽  
pp. 247-261
Author(s):  
Klaus Blaum ◽  
Günter Werth
Keyword(s):  
Penning Trap ◽  
Magnetic Moments ◽  
Ion Traps ◽  
Detection Methods ◽  
Penning Traps ◽  
Atomic Particle ◽  
Ideal Object ◽  
Electric And Magnetic Fields ◽  
Unlimited Time ◽  
The Masses

Abstract“A single atomic particle forever floating at rest in free space” (H. Dehmelt) would be the ideal object for precision measurements of atomic properties and for tests of fundamental theories. Such an ideal, of course, can ultimately never be achieved. A very close approximation to this ideal is made possible by ion traps, where electromagnetic forces are used to confine charged particles under well-controlled conditions for practically unlimited time. Concurrently, sensitive detection methods have been developed to allow observation of single stored ions. Various cooling methods can be employed to bring the trapped ion nearly to rest. Among different realisations of ion traps we consider in this chapter the so-called Penning traps which use static electric and magnetic fields for ion confinement. After a brief discussion of Penning-trap properties, we consider various experiments including the application of the “continuous Stern-Gerlach effect”, which have led recently to precise determinations of the masses and magnetic moments of particles and antiparticles. These serve as input for testing fundamental theories and symmetries.

scholarly journals Fermion Scattering in a CPT-Even Lorentz Violation Quantum Electrodynamics

Symmetry ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 302 ◽  
Author(s):  
Frederico Santos ◽  
Manoel Ferreira
Keyword(s):  
Energy Dependence ◽  
Cross Sections ◽  
Quantum Electrodynamics ◽  
Lorentz Violation ◽  
Photon Propagator ◽  
Feynman Rules

In this work, we reassess two known processes of Quantum Electrodynamics involving electrons and muons. The photon propagator is modified by a CPT-even Lorentz-violating (LV) tensor, while fermion lines and the vertex interaction are not altered. Using the Feynman rules, the associated cross sections for unpolarized scatterings are evaluated, revealing the usual energy dependence and Lorentz-violating contributions that induce space anisotropy. A possible route to constraining the LV coefficients is presented and the results properly commented.

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