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 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 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.

Antihydrogen Physics at ALPHA/CERNThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.

2009 ◽  
Vol 87 (7) ◽  
pp. 791-797 ◽  
Author(s):  
C. L. Cesar ◽  
G. B. Andresen ◽  
W. Bertsche ◽  
P. D. Bowe ◽  
C. C. Bray ◽  
...  
Keyword(s):  
High Precision ◽  
Quantum Electrodynamics ◽  
Fundamental Constants ◽  
Cpt Violation ◽  
Cpt Symmetry ◽  
Trapped Atoms ◽  
Fundamental Physics ◽  
Atomic Systems ◽  
Unique System ◽  
Recent Developments

Cold antihydrogen has been produced at CERN (Amoretti et al. (Nature, 419, 456 (2002)), Gabrielse et al. (Phys. Rev. Lett. 89, 213401 (2002))), with the aim of performing a high-precision spectroscopic comparison with hydrogen as a test of the CPT symmetry. Hydrogen, a unique system used for the development of quantum mechanics and quantum electrodynamics, has been continuously used to produce high-precision tests of theories and measurements of fundamental constants and can lead to a very sensitive search for CPT violation. After the initial production of cold antihydrogen atoms by the ATHENA group, the ALPHA Collaboration ( http://alpha.web.cern.ch/ ) has set forth on an experiment to trap and perform high-resolution laser spectroscopy on the 1S-2S transition of both atoms. In this contribution, we will review the motivations, goals, techniques, and recent developments towards this fundamental physics test. We present new discussion on predicted lineshapes for the 1S-2S spectroscopy of trapped atoms in a regime not discussed before.

Magnetic Moments of Electrons and Positrons

1980 ◽  
pp. 183-187
Author(s):  
David E. Newman ◽  
Eric Sweetman ◽  
Ralph S. Conti ◽  
Arthur Rich
Keyword(s):  
Magnetic Moments ◽  
Electrons And Positrons

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 Challenging the standard model by high-precision comparisons of the fundamental properties of protons and antiprotons

2018 ◽  
Vol 376 (2116) ◽  
pp. 20170275 ◽  
Author(s):  
S. Ulmer ◽  
A. Mooser ◽  
H. Nagahama ◽  
S. Sellner ◽  
C. Smorra
Keyword(s):  
Standard Model ◽  
Particle Physics ◽  
Precise Measurement ◽  
Penning Trap ◽  
Magnetic Moments ◽  
Fundamental Properties ◽  
Stringent Constraint ◽  
The Standard Model ◽  
Charge Parity ◽  
Time Invariance

The BASE collaboration investigates the fundamental properties of protons and antiprotons, such as charge-to-mass ratios and magnetic moments, using advanced cryogenic Penning trap systems. In recent years, we performed the most precise measurement of the magnetic moments of both the proton and the antiproton, and conducted the most precise comparison of the proton-to-antiproton charge-to-mass ratio. In addition, we have set the most stringent constraint on directly measured antiproton lifetime, based on a unique reservoir trap technique. Our matter/antimatter comparison experiments provide stringent tests of the fundamental charge–parity–time invariance, which is one of the fundamental symmetries of the standard model of particle physics. This article reviews the recent achievements of BASE and gives an outlook to our physics programme in the ELENA era. This article is part of the Theo Murphy meeting issue ‘Antiproton physics in the ELENA era’.

scholarly journals Theory of the Anomalous Magnetic Moment of the Electron

Atoms ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 28 ◽  
Author(s):  
Tatsumi Aoyama ◽  
Toichiro Kinoshita ◽  
Makiko Nio
Keyword(s):  
Fine Structure ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Quantum Electrodynamics ◽  
Penning Trap ◽  
Weak Interactions ◽  
Perturbation Expansion ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Best Value

The anomalous magnetic moment of the electron a e measured in a Penning trap occupies a unique position among high precision measurements of physical constants in the sense that it can be compared directly with the theoretical calculation based on the renormalized quantum electrodynamics (QED) to high orders of perturbation expansion in the fine structure constant α , with an effective parameter α / π . Both numerical and analytic evaluations of a e up to ( α / π ) 4 are firmly established. The coefficient of ( α / π ) 5 has been obtained recently by an extensive numerical integration. The contributions of hadronic and weak interactions have also been estimated. The sum of all these terms leads to a e ( theory ) = 1 159 652 181.606 ( 11 ) ( 12 ) ( 229 ) × 10 − 12 , where the first two uncertainties are from the tenth-order QED term and the hadronic term, respectively. The third and largest uncertainty comes from the current best value of the fine-structure constant derived from the cesium recoil measurement: α − 1 ( Cs ) = 137.035 999 046 ( 27 ) . The discrepancy between a e ( theory ) and a e ( ( experiment ) ) is 2.4 σ . Assuming that the standard model is valid so that a e (theory) = a e (experiment) holds, we obtain α − 1 ( a e ) = 137.035 999 1496 ( 13 ) ( 14 ) ( 330 ) , which is nearly as accurate as α − 1 ( Cs ) . The uncertainties are from the tenth-order QED term, hadronic term, and the best measurement of a e , in this order.

scholarly journals QUANTUM ELECTRODYNAMICS OF RELATIVISTIC BOUND STATES WITH CUTOFFS

2004 ◽  
Vol 01 (02) ◽  
pp. 271-314 ◽  
Author(s):  
JEAN-MARIE BARBAROUX ◽  
MOUEZ DIMASSI ◽  
JEAN-CLAUDE GUILLOT
Keyword(s):  
Current Density ◽  
Coulomb Potential ◽  
Ground State ◽  
Quantum Electrodynamics ◽  
Bound States ◽  
Coupling Constants ◽  
Relativistic Electrons ◽  
Small Coupling ◽  
Electrons And Positrons ◽  
Relativistic Bound States

We consider a Hamiltonian with ultraviolet and infrared cutoffs, describing the interaction of relativistic electrons and positrons in the Coulomb potential with photons in Coulomb gauge. The interaction includes both interaction of the current density with transversal photons and the Coulomb interaction of charge density with itself. We prove that the Hamiltonian is self-adjoint and has a ground state for sufficiently small coupling constants.

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