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Phenomenology of a new minimal supersymmetric extension of the standard model

Phenomenology of a new minimal supersymmetric extension of the standard model
Phenomenology of a new minimal supersymmetric extension of the standard model
We study the phenomenology of a new minimally extended supersymmetric standard model (nMSSM) where a gauge singlet superfield is added to the MSSM spectrum. The superpotential of this model contains no dimensionful parameters, thus solving the ? problem of the MSSM. A global discrete R symmetry, forbidding the cubic singlet self-interaction, imposed on the complete theory, guarantees its stability with respect to generated higher-order tadpoles of the singlet and solves both the domain wall and Peccei-Quinn axion problems. We give the free parameters of the model and display some general constraints on them. Particular attention is devoted to the neutralino sector where a (quasipure) singlino appears to be always the LSP of the model, leading to additional cascades, involving the NLSP ? LSP transition, compared with the MSSM. We then present the upper bounds on the masses of the lightest and next-to-lightest—when the lightest is an invisible singlet—CP-even Higgs bosons, including the full one-loop and dominant two-loop corrections. These bounds are found to be much higher than the equivalent ones in the MSSM. Finally, we discuss some phenomenological implications for the Higgs sector of the nMSSM in Higgs boson production at future hadron colliders.
1550-7998
055009-[9pp]
Dedes, A.
f0bbcb6b-d63d-46d9-bf61-fba5a5b3b017
Hugonie, C.
92aff30e-b9d8-4b3c-ab5d-de4ae66184bf
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Tamvakis, K.
558f53b7-2f94-418b-ae0e-1ed7f6d0a705
Dedes, A.
f0bbcb6b-d63d-46d9-bf61-fba5a5b3b017
Hugonie, C.
92aff30e-b9d8-4b3c-ab5d-de4ae66184bf
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Tamvakis, K.
558f53b7-2f94-418b-ae0e-1ed7f6d0a705

Dedes, A., Hugonie, C., Moretti, S. and Tamvakis, K. (2001) Phenomenology of a new minimal supersymmetric extension of the standard model. Physical Review D, 63 (5), 055009-[9pp]. (doi:10.1103/PhysRevD.63.055009).

Record type: Article

Abstract

We study the phenomenology of a new minimally extended supersymmetric standard model (nMSSM) where a gauge singlet superfield is added to the MSSM spectrum. The superpotential of this model contains no dimensionful parameters, thus solving the ? problem of the MSSM. A global discrete R symmetry, forbidding the cubic singlet self-interaction, imposed on the complete theory, guarantees its stability with respect to generated higher-order tadpoles of the singlet and solves both the domain wall and Peccei-Quinn axion problems. We give the free parameters of the model and display some general constraints on them. Particular attention is devoted to the neutralino sector where a (quasipure) singlino appears to be always the LSP of the model, leading to additional cascades, involving the NLSP ? LSP transition, compared with the MSSM. We then present the upper bounds on the masses of the lightest and next-to-lightest—when the lightest is an invisible singlet—CP-even Higgs bosons, including the full one-loop and dominant two-loop corrections. These bounds are found to be much higher than the equivalent ones in the MSSM. Finally, we discuss some phenomenological implications for the Higgs sector of the nMSSM in Higgs boson production at future hadron colliders.

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Published date: 1 March 2001

Identifiers

Local EPrints ID: 38481
URI: http://eprints.soton.ac.uk/id/eprint/38481
ISSN: 1550-7998
PURE UUID: 92e7361e-0a45-4451-bf1a-ad34525c16e2

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Date deposited: 09 Jun 2006
Last modified: 02 Dec 2019 19:30

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