Constants of extended Standard Model and search for their temporal variations

TL;DR

This paper reviews methods to determine and measure the constants of an extended Standard Model, including gravity and neutrinos, compares their precisions across energy scales, and discusses potential temporal variations and their implications.

Contribution

It introduces methods for precise determination of extended Standard Model constants and analyzes their possible temporal variations and experimental bounds.

Findings

Comparison of constants' accuracies at different energy scales

Experimental bounds on temporal variations of constants

Implications for metrology and Standard Model extensions

Abstract

Some methods for the determination and the most precise values of constants of an extended Standard Model, which include the gravitation interaction and massive neutrinos, are presented. Accuracies of constants at different energy scales are compared and the possible manifestations of temporal variations of constants are considered. Theoretical estimations and obtained experimental bounds of variations are listed, that is important as for search of SM generalizations as to account for possible influence on metrological characteristics of measurement standards.