Higgs mass and the Stueckelberg mechanism in supersymmetry

Pérez, P.; Spinner, Sogee

doi:10.1103/physrevd.89.095004

“…In light of the Higgs discovery in 2012, there has been renewed interest in D-term extensions [23][24][25][26][27][28][29][30][31][32][33][34]. In most of these references, the motivation for an extended gauge group is to obtain the Higgs mass in a natural supersymmetric scenario i.e to minimize the fine tuning.…”

Section: Introductionmentioning

confidence: 99%

Light Stops in a minimal U(1)x extension of the MSSM

Capdevilla,

Delgado,

Martin

2015

Preprint

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In order to reproduce the measured mass of the Higgs boson m h = 125 GeV in the minimal supersymmetric standard model, one usually has to rely on heavy stops. By introducing a new gauge sector, the Higgs mass gets a tree-level contribution via a non-decoupling D-term, and m h = 125 GeV can be obtained with lighter stops. In this paper, we study the values of the stops masses needed to achieve the correct Higgs mass in a setup where the gauge group is extended by a single U (1)x interaction. We derive the experimental limits on the mass of the Z gauge boson in this setup, then discuss how the stops masses vary as a function of the free parameters introduced by the new sector. We find that the correct Higgs mass can be reproduced with stops in a region between 700 − 800 GeV and a Z resonance close to the 2.5 TeV bound from the run-I of the LHC, or in a higher region 800 − 900 GeV if the Z resonance is heavier (3.1 TeV). This region of parameter space will be quickly accessible at run-II of the LHC, and we discuss the impact of the projected run-II bounds on the U (1)x parameter space. We also discuss the phenomenology of the Higgs-like particles introduced to break U (1)x and conclude their effects are too small to be detected at current colliders.

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“…Several works already exist trying to explain the 3.5 keV line such as from decaying dark particle [3] and emission from a dark atom [4,5]. Here we consider the possibility that the gamma emission arises from the decay of a real field ρ that arises naturally in a U (1) X extension of the standard model gauge group [6][7][8][9] (see also [10][11][12][13][14][15][16][17][18]). In the U (1) X Stueckelberg extension of MSSM we assume that all the MSSM particles are neutral under U (1) X but that there exists extra matter in the form of a vectorlike multiplet which is charged under U (1) X .…”

Section: Introductionmentioning

confidence: 99%

3.5 keV galactic emission line as a signal from the hidden sector

Chen

¹

,

Liu

²

,

Nath

³

2014

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An emission line with energy of E ∼ 3.5 keV has been observed in galaxy clusters by two experiments. The emission line is consistent with the decay of a dark matter particle with a mass of ∼7 keV. In this work we discuss the possibility that the dark particle responsible for the emission is a real scalar (ρ) which arises naturally in a Uð1Þ X Stueckelberg extension of minimal supersymmetric standard model (MSSM). In the MSSM Stueckelberg extension ρ couples only to other scalars carrying a Uð1Þ X quantum number. Under the assumption that there exists a vectorlike leptonic generation carrying both SUð2Þ L × Uð1Þ Y and Uð1Þ X quantum numbers, we compute the decay of the ρ into two photons via a triangle loop involving scalars. The relic density of the ρ arises via the decay H 0 → h 0 þ ρ at the loop level involving scalars, and via the annihilation processes of the vectorlike scalars into ρ þ h 0 . It is shown that the galactic data can be explained within a multicomponent dark matter model where the 7 keV dark matter is a subdominant component constituting only 1%-10% of the matter relic density, with the rest being supersymmetric dark matter such as the neutralino. Thus, the direct detection experiments remain viable searches for weakly interacting massive particles. The fact that the dark scalar ρ with no interactions with the standard model particles arises from a Stueckelberg extension of a hidden Uð1Þ X implies that the 3.5 keV galactic line emission is a signal from the hidden sector.

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Light stops in a minimalU(1)xextension of the MSSM

Capdevilla

¹

,

Delgado

²

,

Martin

³

2015

View full text Add to dashboard Cite

In order to reproduce the measured mass of the Higgs boson m h = 125 GeV in the minimal supersymmetric standard model, one usually has to rely on heavy stops. By introducing a new gauge sector, the Higgs mass gets a tree-level contribution via a non-decoupling D-term, and m h = 125 GeV can be obtained with lighter stops. In this paper, we study the values of the stops masses needed to achieve the correct Higgs mass in a setup where the gauge group is extended by a single U (1)x interaction. We derive the experimental limits on the mass of the Z gauge boson in this setup, then discuss how the stops masses vary as a function of the free parameters introduced by the new sector. We find that the correct Higgs mass can be reproduced with stops in a region between 700 − 800 GeV and a Z resonance close to the 2.5 TeV bound from the run-I of the LHC, or in a higher region 800 − 900 GeV if the Z resonance is heavier (3.1 TeV). This region of parameter space will be quickly accessible at run-II of the LHC, and we discuss the impact of the projected run-II bounds on the U (1)x parameter space. We also discuss the phenomenology of the Higgs-like particles introduced to break U (1)x and conclude their effects are too small to be detected at current colliders.

show abstract

Higgs mass and the Stueckelberg mechanism in supersymmetry

Cited by 3 publications

References 22 publications

Light Stops in a minimal U(1)x extension of the MSSM

Light Stops in a minimal U(1)x extension of the MSSM

3.5 keV galactic emission line as a signal from the hidden sector

Light stops in a minimalU(1)xextension of the MSSM

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