Approximate R-symmetries and the mu term
Felix Brummer, Rolf Kappl, Michael Ratz, Kai Schmidt-Hoberg
TL;DR
This paper explores how approximate U(1)_R symmetries can explain natural hierarchies, including the suppression of the superpotential and solving the MSSM mu problem, through examples in field theory and string models.
Contribution
It demonstrates the potential of approximate R-symmetries to address key hierarchy issues in particle physics, especially the mu problem in the MSSM.
Findings
Approximate R-symmetries can suppress the superpotential expectation value.
Examples show how R-symmetries solve the MSSM mu problem.
String-derived models incorporate these symmetries effectively.
Abstract
We discuss the role of approximate U(1)_R symmetries for the understanding of hierarchies in Nature. Such symmetries may explain a suppressed expectation value of the superpotential and provide us with a solution to the MSSM mu problem. We present various examples in field theory and string-derived models.
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