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Fine tuning in the constrained exceptional supersymmetric standard model

Fine tuning in the constrained exceptional supersymmetric standard model
Fine tuning in the constrained exceptional supersymmetric standard model
Supersymmetric unified models in which the Z ? couples to the Higgs doublets, as in the E 6 class of models, have large fine tuning dominated by the experimental mass limit on the Z ? . To illustrate this, we investigate the degree of fine tuning throughout the parameter space of the constrained exceptional supersymmetric standard model (cE 6 SSM ) that is consistent with a Higgs mass m h ?125??GeV . Fixing tan?=10 , and taking specific values of the mass of the Z ? boson, with M Z ? ?2–4??TeV , we find that the minimum fine tuning is set predominantly from the mass of Z ? and varies from ?200 to 400 as we vary M Z ? from ?2 to 4 TeV. However, this is significantly lower than the fine tuning in the constrained minimal supersymmetric standard model, of O(1000) , arising from the large stop masses required to achieve the Higgs mass.
1550-7998
1-15
Athron, P.
5ac03b61-f44c-466f-b6ee-28fef4e3ab27
Binjonaid, Maien
f649290f-12fb-4663-836f-ff09d4d7854b
King, S. F.
f8c616b7-0336-4046-a943-700af83a1538
Athron, P.
5ac03b61-f44c-466f-b6ee-28fef4e3ab27
Binjonaid, Maien
f649290f-12fb-4663-836f-ff09d4d7854b
King, S. F.
f8c616b7-0336-4046-a943-700af83a1538

Athron, P., Binjonaid, Maien and King, S. F. (2013) Fine tuning in the constrained exceptional supersymmetric standard model. Physical Review D, 87 (11), 1-15. (doi:10.1103/PhysRevD.87.115023).

Record type: Article

Abstract

Supersymmetric unified models in which the Z ? couples to the Higgs doublets, as in the E 6 class of models, have large fine tuning dominated by the experimental mass limit on the Z ? . To illustrate this, we investigate the degree of fine tuning throughout the parameter space of the constrained exceptional supersymmetric standard model (cE 6 SSM ) that is consistent with a Higgs mass m h ?125??GeV . Fixing tan?=10 , and taking specific values of the mass of the Z ? boson, with M Z ? ?2–4??TeV , we find that the minimum fine tuning is set predominantly from the mass of Z ? and varies from ?200 to 400 as we vary M Z ? from ?2 to 4 TeV. However, this is significantly lower than the fine tuning in the constrained minimal supersymmetric standard model, of O(1000) , arising from the large stop masses required to achieve the Higgs mass.

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PhysRevD.87.115023 - Version of Record
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Published date: 2013
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 369411
URI: https://eprints.soton.ac.uk/id/eprint/369411
ISSN: 1550-7998
PURE UUID: 34eeac90-6723-436e-b01d-f0096e08f190

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Date deposited: 25 Sep 2014 13:50
Last modified: 19 Jul 2019 21:01

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