En-gauging naturalness

Bharucha, Aoife; Goudelis, Andreas; McGarrie, Moritz

doi:10.1140/epjc/s10052-014-2858-7

Cited by 20 publications

(30 citation statements)

References 124 publications

(247 reference statements)

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“…In the following, we describe three distinct possibilities for a natural theory of EWSB that accomodates the experimentally measured Higgs mass: (i) adding extra matter (in the form of vector-like leptons) coupling to the Higgs with O(1) Yukawa couplings, (ii) extending the gauge group of the theory with an extra U (1) factor under which the Higgs is charged, and (iii) adding a brane-localized SM-singlet that couples to both Higgs doublets. Similar extensions have been studied in the context of realizing a 125 GeV Higgs in 4D MSSM-like models [85][86][87][88][89][90][91], and we find that these mechanisms are easily implemented in MNSUSY, with potentially interesting consequences to the phenomenology discussed in Section 5.…”

Section: Extended Sectorssupporting

confidence: 68%

Natural Scherk-Schwarz theories of the weak scale

García

Howe

March-Russell

2015

J. High Energ. Phys.

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Natural supersymmetric theories of the weak scale are under growing pressure given present LHC constraints, raising the question of whether untuned supersymmetric (SUSY) solutions to the hierarchy problem are possible. In this paper, we explore a class of 5-dimensional natural SUSY theories in which SUSY is broken by the Scherk-Schwarz mechanism. We pedagogically explain how Scherk-Schwarz elegantly solves the traditional problems of 4-dimensional SUSY theories (based on the MSSM and its many variants) that usually result in an unsettling level of fine-tuning. The minimal Scherk-Schwarz set up possesses novel phenomenology, which we briefly outline. We show that achieving the observed physical Higgs mass motivates extra structure that does not significantly affect the level of tuning (always better than ∼ 10%) and we explore three qualitatively different extensions: the addition of extra matter that couples to the Higgs, an extra U(1) gauge group under which the Higgs is charged and an NMSSM-like solution to the Higgs mass problem.

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Section: Extended Sectorssupporting

confidence: 68%

Natural Scherk-Schwarz theories of the weak scale

García

Howe

March-Russell

2015

J. High Energ. Phys.

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“…Models with non decoupling D-terms have been studied in [8,[24][25][26][27][28][29][30][31][32][33], and in [34] the fine tuning was studied for a heavy Higgs boson. In [16,35] the Higgs couplings deviations from the SM behavior were studied in the effective theory below the heavy vectors threshold, but with a different emphasis and without discussing fine tuning implications.…”

Section: Introductionmentioning

confidence: 99%

Natural SM-like 126 GeV Higgs boson via nondecoupling D terms

Bertuzzo¹,

Frugiuele²

2016

Phys. Rev. D

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Accommodating both a 126 GeV mass and Standard Model (SM) like couplings for the Higgs has a fine tuning price in supersymmetric models. Examples are the MSSM, in which SM-like couplings are natural, but raising the Higgs mass up to 126 GeV requires a considerable tuning, or the NMSSM, in which the situation is reversed: the Higgs is naturally heavier, but being SM-like requires some tuning. We show that models with non-decoupling D-terms alleviate this tension -a 126 GeV SM-like Higgs comes out basically with no fine tuning cost. In addition, the analysis of the fine tuning of the extended gauge sector shows that naturalness requires the heavy gauge bosons to likely be within the LHC run II reach.

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“…For the case of the MSSM, we consider two ways to raise the Higgs mass to 126 GeV: an additional D-term allows the quartic Higgs coupling to be sufficiently increased already at tree-level [6][7][8][9]. Stops can then remain as light as possible consistent with the latest collider bounds.…”

Section: Jhep04(2014)180mentioning

confidence: 99%

“…For our purposes, it is enough to know that realistic models can achieve ∆ 1 and ∆ 2 sufficiently large to raise the quartic coupling to the required value (see [6,9,16] for more details). In this section, we will therefore treatg as a free parameter whose value is fixed by the requirement that m Higgs ≈ 126 GeV.…”

Section: The Higgs Sectormentioning

confidence: 99%

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The price of being SM-like in SUSY

Gherghetta

Harling

Medina

et al. 2014

J. High Energ. Phys.

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Abstract:We compute the tuning in supersymmetric models associated with the constraints from collider measurements of the Higgs couplings to fermions and gauge bosons. In supersymmetric models, a CP -even state with SM Higgs couplings mixes with additional, heavier CP -even states, causing deviations in the Higgs couplings from SM values. These deviations are reduced as the heavy states are decoupled with large soft masses, thereby exacerbating the tuning associated with the electroweak scale. This new source of tuning is different from that derived from collider limits on stops, gluinos and Higgsinos. It can be offset with large tan β in the MSSM, however this compensating effect is limited in the NMSSM with a large Higgs-singlet coupling due to restrictions on large tan β from electroweak precision tests. We derive a lower bound on this tuning and show that the level of precision of Higgs coupling measurements at the LHC will probe naturalness in the NMSSM at the few-percent level. This is comparable to the tuning derived from superpartner limits in models with a low messenger scale and split families. Instead the significant improvement in sensitivity of Higgs coupling measurements at the ILC will allow naturalness in these models to be constrained at the per-mille level, beyond any tuning derived from direct superpartner limits.

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En-gauging naturalness

Cited by 20 publications

References 124 publications

Natural Scherk-Schwarz theories of the weak scale

Natural Scherk-Schwarz theories of the weak scale

Natural SM-like 126 GeV Higgs boson via nondecoupling D terms

The price of being SM-like in SUSY

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