The MSSM fine tuning problem: a way out

Details The MSSM fine tuning problem: a way out The MSSM fine tuning problem: a way out

2003-10-10

arxiv.org/abs/hep-ph/0310137v2

JHEP 0401:008,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 9 PS figures, LaTeX Published version

Scientific paper

10.1088/1126-6708/2004/01/008

As is well known, electroweak breaking in the MSSM requires substantial fine-tuning, mainly due to the smallness of the tree-level Higgs quartic coupling, lambda_tree. Hence the fine tuning is efficiently reduced in supersymmetric models with larger lambda_tree, as happens naturally when the breaking of SUSY occurs at a low scale (not far from the TeV). We show, in general and with specific examples, that a dramatic improvement of the fine tuning (so that there is virtually no fine-tuning) is indeed a very common feature of these scenarios for wide ranges of tan(beta) and the Higgs mass (which can be as large as several hundred GeV if desired, but this is not necessary). The supersymmetric flavour problems are also drastically improved due to the absence of RG cross-talk between soft mass parameters.

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