Natural Islands for a 125 GeV Higgs in the scale-invariant NMSSM - INSPIRE

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Natural Islands for a 125 GeV Higgs in the scale-invariant NMSSM

Sep, 2012

36 pages

Published in:

JHEP 02 (2013) 031

e-Print:

1209.2115 [hep-ph]

DOI:

10.1007/JHEP02(2013)031

Report number:

UMD-PP-012-021

View in:

ADS Abstract Service

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Abstract: (Springer)

We study whether a 125 GeV standard model-like Higgs boson can be accommodated within the scale-invariant NMSSM in a way that is natural in all respects, i.e., not only is the stop mass and hence its loop contribution to Higgs mass of natural size, but we do not allow significant tuning of NMSSM parameters as well. We pursue as much as possible an analytic approach which gives clear insights on various ways to accommodate such a Higgs mass, while conducting complementary numerical analyses. We consider both scenarios with singlet-like state being heavier and lighter than SM-like Higgs. With A-terms being small, we find for the NMSSM to be perturbative up to GUT scale, it is not possible to get 125 GeV Higgs mass, which is true even if we tune parameters of NMSSM. If we allow some of the couplings to become non-perturbative below the GUT scale, then the non-tuned option implies that the singlet self-coupling, κ, is larger than the singlet-Higgs coupling, λ, which itself is order 1. This leads to a Landau pole for these couplings close to the weak scale, in particular below ~ 10(4) TeV. In both the perturbative and non-perturbative NMSSM, allowing large A (λ) , A (κ) gives “more room” to accommodate a 125 GeV Higgs, but a tuning of these A-terms may be needed. In our analysis we also conduct a careful study of the constraints on the parameter space from requiring global stability of the desired vacuum fitting a 125 GeV Higgs, which is complementary to existing literature. In particular, as the singlet-higgs coupling λ increases, vacuum stability becomes more serious of an issue.

Note:

34 pages, 4 figures, references added, minor corrections to text and figures, version to be published in JHEP

Higgs particle: mass
vacuum state: stability
stop: mass
Higgs particle: coupling
minimal supersymmetric standard model
invariance: scale
CERN LEP Stor
CERN LHC Coll

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