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Naturalness of the Non-Universal MSSM in the Light of the Recent Higgs Results

Antusch, Stefan and Calibbi, Lorenzo and Maurer, Vinzenz and Monaco, Maurizio and Spinrath, Martin. (2013) Naturalness of the Non-Universal MSSM in the Light of the Recent Higgs Results. Journal of High Energy Physics, 1. p. 187.

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Official URL: http://edoc.unibas.ch/dok/A6212208

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Abstract

We analyse the naturalness of the Minimal Supersymmetric Standard Model (MSSM) in the light of recent LHC results from the ATLAS and CMS experiments. We study non-universal boundary conditions for the scalar and the gaugino sector, with fixed relations between some of the soft breaking parameters, and find a significant reduction of fine-tuning for non-universal gaugino masses. For a Higgs mass of about 125 GeV, as observed recently, we find parameter regions with a fine-tuning of O (10), taking into account experimental and theoretical uncertainties. These regions also survive after comparison with simplified model searches in ATLAS and CMS. For a fine-tuning less than 20 the lightest neutralino is expected to be lighter than about 400 GeV and the lighter stop can be as heavy as 3.5TeV. On the other hand, the gluino mass is required to be above 1.5 TeV. For non-universal gaugino masses, we discuss which fixed GUT scale ratios can lead to a reduced fine-tuning and find that the recent Higgs results have a strong impact on which ratio is favoured. We also discuss the naturalness of GUT scale Yukawa relations, comparing the non-universal MSSM with the CMSSM.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer
ISSN:1029-8479
e-ISSN:1029-8479
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:13 Feb 2017 14:19
Deposited On:31 Jan 2014 09:49

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