scholarly journals Towards an Improved Test of the Standard Model’s Most Precise Prediction

Atoms ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 45 ◽  
Author(s):  
G. Gabrielse ◽  
S. Fayer ◽  
T. Myers ◽  
X. Fan
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Experimental Method ◽  
Particle Physics ◽  
Measurement Accuracy ◽  
Magnetic Moments ◽  
The Standard Model ◽  
Order Of Magnitude ◽  
Precise Prediction

The electron and positron magnetic moments are the most precise prediction of the standard model of particle physics. The most accurate measurement of a property of an elementary particle has been made to test this result. A new experimental method is now being employed in an attempt to improve the measurement accuracy by an order of magnitude. Positrons from a “student source” now suffice for the experiment. Progress toward a new measurement is summarized.

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 Die topkwark

1998 ◽  
Vol 17 (2) ◽  
pp. 68-71
Author(s):  
R. Tegen
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Top Quark ◽  
Particle Physics ◽  
Relevant Literature ◽  
Big Bang ◽  
Elementary Particle Physics ◽  
The Standard Model ◽  
Technical Article

The importance of the recent discovery of the top-quark at Fermilab in Chicago is reviewed. It is shown that the top-quark is important for Big-Bang physics as well as for the Standard Model of Elementary Particle Physics. Relevant literature for further reading can be traced from the list of references given in this short, non-technical article.

Chapter 1 Physics Goal of BES-III

2009 ◽  
Vol 24 (supp01) ◽  
pp. 3-7 ◽  
Author(s):  
Jian-Ping Ma
Keyword(s):  
Elementary Particle ◽  
Standard Model ◽  
Quantum Chromodynamics ◽  
Particle Physics ◽  
New Physics ◽  
The Other ◽  
Fundamental Theory ◽  
Elementary Particle Physics ◽  
The Standard Model

The Standard Model (SM) has been successful at describing all relevant experimental phenomena and, thus, has been generally accepted as the fundamental theory of elementary particle physics. Despite its success, the SM leaves many unanswered questions. These can be classified into two main categories: one for subjects related to possible new physics at unexplored energy scales and the other for nonperturbertive physics, mostly related to Quantum Chromodynamics…

scholarly journals NEUTRINO MAGNETIC MOMENTS AND MINIMAL SUPERSYMMETRIC SO(10) MODEL

2004 ◽  
Vol 19 (28) ◽  
pp. 4825-4833 ◽  
Author(s):  
TAKESHI FUKUYAMA ◽  
TATSURU KIKUCHI ◽  
NOBUCHIKA OKADA
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Magnetic Moments ◽  
Matrix Elements ◽  
Mass Matrices ◽  
The Standard Model ◽  
Order Of Magnitude ◽  
Majorana Neutrinos ◽  
Soft Supersymmetry Breaking

We examine supersymmetric contributions to transition magnetic moments of Majorana neutrinos. We first give the general formula for it. In concrete evaluations, informations of neutrino mass matrix elements including CP phases are necessary. Using unambiguously determined neutrino mass matrices in recently proposed minimal supersymmetric SO (10) model, the transition magnetic moments are calculated. The resultant neutrino magnetic moments with the input soft supersymmetry breaking masses being of order 1 TeV are found to be roughly an order of magnitude larger than those calculated in the standard model extended to incorporate the see-saw mechanism.

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