On the MSSM Higgsino mass and fine tuning

It is often argued that low fine tuning in the MSSM necessarily requires a rather light Higgsino. In this note we show that this need not be the case when a more complete set of soft SUSY breaking mass terms are included. In particular an Higgsino mass term, that correlates the μ-term contribution w...

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Bibliographic Details
Published in:Physics letters. B 2016-08, Vol.759 (C), p.110-114
Main Authors: Ross, Graham G., Schmidt-Hoberg, Kai, Staub, Florian
Format: Article
Language:English
Subjects:
Abundance
Breaking
Correlation
Dark matter
Elementary particles
Tuning
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Summary:It is often argued that low fine tuning in the MSSM necessarily requires a rather light Higgsino. In this note we show that this need not be the case when a more complete set of soft SUSY breaking mass terms are included. In particular an Higgsino mass term, that correlates the μ-term contribution with the soft SUSY-breaking Higgsino masses, significantly reduces the fine tuning even for Higgsinos in the TeV mass range where its relic abundance means it can make up all the dark matter.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2016.05.053