LIMITS ON TEMPORAL VARIATION OF FINE STRUCTURE CONSTANT, QUARK MASSES AND STRONG INTERACTION

2004 ◽  
Author(s):  
V.V. FLAMBAUM
Keyword(s):  
Fine Structure ◽  
Temporal Variation ◽  
Strong Interaction ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Quark Masses

scholarly journals Leading isospin-breaking corrections to meson masses on the lattice

2018 ◽  
Vol 175 ◽  
pp. 06002 ◽  
Author(s):  
Davide Giusti ◽  
Vittorio Lubicz ◽  
Guido Martinelli ◽  
Francesco Sanfilippo ◽  
Silvano Simula ◽  
...  
Keyword(s):  
Fine Structure ◽  
Quark Mass ◽  
Light Quark ◽  
Structure Constant ◽  
Mass Splitting ◽  
Fine Structure Constant ◽  
Isospin Breaking ◽  
Decay Constants ◽  
Quark Masses ◽  
Small Parameters

We present a study of the isospin-breaking (IB) corrections to pseudoscalar (PS) meson masses using the gauge configurations produced by the ETM Collaboration with Nf = 2+1+1 dynamical quarks at three lattice spacings varying from 0.089 to 0.062 fm. Our method is based on a combined expansion of the path integral in powers of the small parameters [see formula in PDF] and αem, where [see formula in PDF] is the renormalized quark mass and αem the renormalized fine structure constant. We obtain results for the pion, kaon and Dmeson mass splitting; for the Dashen’s theorem violation parameters ϵγ(MM, 2 GeV), ϵπ0 ϵK0(MS, 2 GeV) for the light quark masses [see formula in PDF] for the flavour symmetry breaking parameters R(MS, 2 GeV) and Q(MS, 2 GeV) and for the strong IB effects on the kaon decay constants.

scholarly journals Limit on the Present Temporal Variation of the Fine Structure Constant

2004 ◽  
Vol 93 (17) ◽  
Author(s):  
E. Peik ◽  
B. Lipphardt ◽  
H. Schnatz ◽  
T. Schneider ◽  
Chr. Tamm ◽  
...  
Keyword(s):  
Fine Structure ◽  
Temporal Variation ◽  
Structure Constant ◽  
Fine Structure Constant

scholarly journals Unification and supersymmetry

1983 ◽  
Vol 310 (1512) ◽  
pp. 279-292 ◽  
Keyword(s):  
Fine Structure ◽  
Weak Interactions ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Fundamental Constants ◽  
Quark Masses ◽  
Fundamental Particles ◽  
Grand Unified Theories ◽  
Mixing Parameter ◽  
Unified Theories

Current attempts to construct unified theories of fundamental particles and their interactions are described, with emphasis on their ability to understand the values of the fundamental constants. Examples include grand unified theories, which enable one to estimate the fine structure constant, the neutral weak interaction mixing parameter and certain quark masses. Finally, a review will be presented of the prospects offered by supersymmetry for understanding the scale of the weak interactions and for an eventual unification with gravity.

scholarly journals Updated Constraints on the Variations of the Fine-Structure Constant from an Analysis of White-Dwarf Spectra

Symmetry ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 936
Author(s):  
Le
Keyword(s):  
Fine Structure ◽  
Temporal Variation ◽  
White Dwarf ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Spatial And Temporal Variation ◽  
Dwarf Star

I used observed spectra from the white-dwarf star G191-B2B to constrain the spatial and temporal variation of the fine-structure constant,[...]

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