Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5390
Title: Stop on top: SUSY parameter regions and fine-tuning constraints
Authors: Demir, Durmuş Ali
Ün, Cem Salih
Keywords: Higgs boson
Supersymmetric models
Top quarks
Standard model
Particles(Nuclear physics)
Issue Date: Nov-2014
Publisher: American Physical Society
Source: Demir, D.A., and Ün, C.S. (2014). Stop on top: SUSY parameter regions and fine-tuning constraints. Physical Review D - Particles, Fields, Gravitation and Cosmology, 90(9). doi:10.1103/PhysRevD.90.095015
Abstract: We analyze minimal supersymmetric models in order to determine in what parameter regions with what amount of fine-tuning they are capable of accommodating the LHC-allowed top-stop degeneracy window. The stops must be light enough to enable Higgs naturalness yet heavy enough to induce a 125 GeV Higgs boson mass. These two constraints imply a large mass splitting. By an elaborate scan of the parameter space, we show that the stop-on-top scenario requires at least ΔCMSSM≃O(104) fine-tuning in the constrained minimal supersymmetric Standard Model (CMSSM). By relaxing the CMSSM parameter space with nonuniversal Higgs masses, we find that ΔNUHM1≃O(104). The CMSSM with a gravitino lightest supersymmetric particle works slightly better than the nonuniversal Higgs mass model. Compared to all these, the CMSSM with μ<0 and nonuniversal gauginos yields a much smaller fine-tuning Δμ,g≃O(100). Our results show that the gaugino sector can pave the road toward a more natural stop-on-top scenario.
URI: https://doi.org/10.1103/PhysRevD.90.095015
http://hdl.handle.net/11147/5390
ISSN: 1550-7998
1550-2368
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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