Focus point supersymmetry in extended gauge mediation

Ding, Ran; Li, Tianjun; Staub, Florian; Zhu, B.

doi:10.1007/jhep03(2014)130

Cited by 25 publications

(30 citation statements)

References 154 publications

(160 reference statements)

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“…This is especially the case in unified scenarios like the constrained MSSM (CMSSM) with only a small set of free parameters at the scale of grand unification (GUT). The most important exception is the focus point region where the fine-tuning has only a mild dependence on the stop masses [7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Naturalness and a light Z′

2017

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Models with a light, additional gauge boson are attractive extensions of the standard model. Often these models are only considered as effective low energy theory without any assumption about an UV completion. This leaves not only the hierarchy problem of the SM unsolved, but introduces a copy of it because of the new fundamental scalars responsible for breaking the new gauge group. A possible solution is to embed these models into a supersymmetric framework. However, this gives rise to an additional source of fine-tuning compared to the MSSM and poses the question how natural such a setup is. One might expect that the additional fine-tuning is huge, namely, O(M 2 SUSY /m 2 Z ). In this paper we point out that this is not necessarily the case. We show that it is possible to find a focus point behaviour also in the new sector in co-existence to the MSSM focus point. We call this 'Double Focus Point Supersymmetry'. Moreover, we stress the need for a proper inclusion of radiative corrections in the fine-tuning calculation: a tree-level estimate would lead to predictions for the tuning which can be wrong by many orders of magnitude. As showcase, we use the U (1)B−L extended MSSM and discuss possible consequence of the observed 8 Be anomaly. However, similar features are expected for other models with an extended gauge group which involve potentially large Yukawa-like interactions of the new scalars.

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Section: Introductionmentioning

confidence: 99%

Naturalness and a light Z′

2017

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“…Perhaps the best-motivated examples arise from theories of GMSB, which frequently predict spectra where the righthanded stau is the next-to-lightest superpartner (NLSP). Although minimal models of GMSB have difficulty accommodating the heavy Higgs mass of 125 GeV [18,19] without introducing large tuning [20], extensions to GMSB can readily account for this while approaching the minimal fine tuning possible in the MSSM, see e.g., [21][22][23][24][25][26][27][28]. Adding new fields to the MSSM can also raise m h , either by GMSB-specific mechanisms, e.g., [29][30][31][32], or with modular modifications to the SUSY Higgs sector, such as non-decoupling D-terms [33][34][35][36][37][38].…”

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confidence: 99%

Long-lived staus and displaced leptons at the LHC

Evans

Shelton

2016

J. High Energ. Phys.

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As the majority of LHC searches are focused on prompt signatures, specific long-lived particles have the potential to be overlooked by the otherwise systematic new physics programs at ATLAS and CMS. While in many cases long-lived superparticles are now stringently constrained by existing exotic searches, we point out that the highly motivated model of gauge mediation with staus as the next-to-lightest superparticle (NLSP) is relatively far less tested. We recast LHC searches for heavy stable charged particles, disappearing tracks, and opposite-flavor leptons with large impact parameters to assess current constraints on a variety of spectra that contain an NLSP stau, and find that portions of the parameter space motivated by naturalness are still experimentally unexplored. We additionally note a gap in the current experimental search program: same-flavor leptons with large impact parameters evade the suite of existing searches for long-lived objects. This gap is especially noteworthy as vetoes on displaced leptons in prompt new physics searches could be systematically discarding such events. We discuss several motivated models that can exhibit same-flavor displaced leptons: gauge mediation with co-NLSP sleptons, extended gauge mediation, R-parity violation, and lepton-flavored dark matter that freezes in during a matter-dominated era of the early universe. To address this gap, we propose a straightforward extension of the CMS search for leptons with large impact parameters, and project sensitivity to these scenarios at 13 TeV. Throughout this analysis, we highlight several methods whereby LHC searches for exotic long-lived objects could potentially improve their sensitivity to the displaced leptons originating from gauge mediation and beyond.

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“…The original focus point allowed to obtain the proper electroweak symmetry breaking scale for large values of the squark and slepton masses and subleading values of the stop mixing parameter A t and gaugino masses M a . More recently, this solution was reconsidered, including the presence of large stop mixing A t [11], large (non universal) gaugino masses [12][13][14] and in the framework of gauge mediation [15,16].…”

Section: Jhep04(2014)093mentioning

confidence: 99%

General focus point in the MSSM

Delgado

Quirós

Wagner

2014

J. High Energ. Phys.

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Abstract:The minimal supersymmetric extension of the Standard Model (SM) is a well motivated scenario for physics beyond the SM, which allows a perturbative description of the theory up to scales of the order of the Grand Unification scale, where gauge couplings unify. The Higgs mass parameter is insensitive to the ultraviolet physics and is only sensitive to the scale of soft supersymmetry breaking parameters. Present collider bounds suggest that the characteristic values of these parameters may be significantly larger than the weak scale. Large values of the soft breaking parameters, however, induce large radiative corrections to the Higgs mass parameter and therefore the proper electroweak scale may only be obtained by a fine tuned cancellation between the square of the holomorphic µ parameter and the Higgs supersymmetry breaking square mass parameter. This can only be avoided if there is a correlation between the scalar and gaugino mass parameters, such that the Higgs supersymmetry breaking parameter remains of the order of the weak scale. The scale at which this happens is dubbed as focus point. In this article, we define the general conditions required for this to happen, for different values of the messenger scale at which supersymmetry breaking is transmitted to the observable sector, and for arbitrary boundary conditions of the sfermion, gaugino, and Higgs mass parameters. Specific supersymmetry breaking scenarios in which these correlations may occur are also discussed.

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Focus point supersymmetry in extended gauge mediation

Cited by 25 publications

References 154 publications

Naturalness and a light Z′

Naturalness and a light Z′

Long-lived staus and displaced leptons at the LHC

General focus point in the MSSM

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