The higgsino-singlino sector of the NMSSM: Combined constraints from dark matter and the LHC

Ellwanger, Ulrich; Hugonie, Cyril

doi:10.48550/arxiv.1806.09478

Cited by 11 publications

(13 citation statements)

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“…Experimentally, the singlet has the advantage that the tree level value of the Higgs mass is increased by the mixing with the singlet, so there is no need for large loop corrections from multi-TeV stop quarks to raise the Higgs mass from below the electroweak scale -expected in the MSSM -to 125 GeV [5,6,[24][25][26][27][28][29]. And last, but not least, the superpartner of the singlet provides an electroweak scale dark matter candidate consistent with all experimental data [30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 60%

Genuine NMSSM deviations in the 125 GeV Higgs boson decays

Beskidt¹

2020

Preprint

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In Supersymmetry deviations from the SM signal strengths of the 125 GeV Higgs boson can occur, because of possible SUSY contributions in diagrams with loops, which leads to different deviations in signal strengths for processes with and without loop diagrams. In the Next-to Minimal Supersymmetric Standard Model (NMSSM) additional deviations may occur, because of the mixing with the additional singlet-like Higgs boson and/or additional decays into pairs of light particles, like neutralinos, pseudo-scalar Higgs bosons or singlet-like Higgs bosons. In this paper we study these "genuine" NMSSM deviations in detail to check not only their possible size, but also look for correlations or anti-correlations with respect to other channels in the hope to find specific patterns in the deviations as for the SUSY contributions, which occur predominantly in processes including loops in the diagrams. The whole NMSSM parameter space is sampled in a deterministic way. The novel scanning method is discussed in detail in the Appendix. We found three different regions with "genuine" NMSSM deviations, which are largely independent of the production mode. What was surprising: some regions show negativ correlations between final states with fermions and bosons meaning if the signal strengths for fermions decrease the signal strengths for bosonic final states increase, while other regions show positive correlations. The sign of the correlations is a strong function of the mass difference between the observed 125 GeV Higgs boson and the Higgs singlet, so looking for correlations could give useful hints about the existence and mass of the singlet Higgs boson. The features of these "genuine" NMSSM effects have been investigated in representative benchmark points for each of the three regions where a single effect is dominant. These benchmark points have been detailed in the Appendix.

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Section: Introductionmentioning

confidence: 60%

Genuine NMSSM deviations in the 125 GeV Higgs boson decays

Beskidt¹

2020

Preprint

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“…The situation may be changed greatly if one embeds the seesaw mechanism into the NMSSM, which, as one of most economical extensions of the MSSM, is characterized by predicting one gauge singlet Higgs superfield Ŝ [38]. It has long been known that the field Ŝ plays an extraordinary role in the model: solving the µ problem of the MSSM [38], enhancing the theoretical prediction about the mass of the SM-like Higgs boson [39][40][41] as well as enriching the phenomenology of the NMSSM (see for example [42][43][44][45][46][47]). In this context we stress that, in the seesaw extension of the NMSSM, it is also responsible for heavy neutrino mass and the annihilation of sneutrino DM [48][49][50], and consequently makes the sneutrino DM compatible with various measurements.…”

Section: Arxiv:180703762v3 [Hep-ph] 30 May 2019mentioning

confidence: 99%

Bayesian analysis of sneutrino dark matter in the NMSSM with a type-I seesaw mechanism

Cao

Pan

et al. 2019

Phys. Rev. D

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In the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with extra heavy neutrino superfields, neutrino may acquire its mass via a seesaw mechanism and sneutrino may act as a viable dark matter (DM) candidate. Given the strong tension between the naturalness for Z boson mass and the DM direct detection experiments for customary neutralino DM candidate, we augment the NMSSM with Type-I seesaw mechanism, which is the simplest extension of the theory to predict neutrino mass, and study the scenarios of sneutrino DM. We construct likelihood function with LHC Higgs data, B-physics measurements, DM relic density and its direct and indirect search limits, and perform a comprehensive scan over the parameter space of the theory by Nested Sampling method. We adopt both Bayesian and frequentist statistical quantities to illustrate the favored parameter space of the scenarios, the DM annihilation mechanism as well as the features of DMnucleon scattering. We find that the scenarios are viable over broad parameter regions, especially the Higgsino mass µ can be below about 250GeV for a significant part of the region, which predicts Z boson mass in a natural way. We also find that the DM usually co-annihilated with the Higgsinos to get the measured relic density, and consequently the DM-nucleon scattering rate is naturally suppressed to coincide with the recent XENON-1T results even for light Higgsinos. Other issues, such as the LHC search for the Higgsinos, are also addressed.1 Numerically speaking, the mixing angle should satisfy sin θν ∼ 0.02 for mν = 100GeV to predict the right DM relic density by the Z boson mediated annihilation, which corresponds to the scattering rate at the order of 10 −45 cm −2 [34]. Such a rate has been excluded by the latest XENON-1T experiment, which, on the other side, limits sin θν < 0.01 by the recent calculation in [35]. Moreover, we find that the correlation between the relic density and the scattering rate is underestimated in FIG.1 of [36].

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“…In this work, we consider possible scenarios of Higgs invisible decay in the semiconstrained NMSSM (scNMSSM) [24][25][26][27][28][29], which relaxing the Higgs masses at GUT scale, and also called NMSSM with non-universal Higgs mass (NUHM). As a simple and graceful SUSY model, the scNMSSM had attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

A Novel Scenario in the Semi-constrained NMSSM

Wang,

Zhu

2020

Preprint

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In this work, we develop a novel efficient scan method, combining the Heuristically Search (HS) and the Generative Adversarial Network (GAN), where the HS can shift marginal samples to perfect samples, and the GAN can generate a huge amount of recommended samples from noise in a short time. With this efficient method, we find a new scenario in the semi-constrained Next-to Minimal Supersymmetric Standard Model (scNMSSM), or NMSSM with non-universal Higgs masses. In this scenario, (i) Both muon g-2 and right relic density can be satisfied, along with the high mass bound of gluino, etc. As far as we know, that had not been realized in the scNMSSM before this work. (ii) With the right relic density, the lightest neutralinos are singlino-dominated, and can be as light as 0-12 GeV. (iii) The future direct detections XENONnT and LUX-ZEPLIN (LZ-7 2T) can give strong constraints to this scenario. (iv) The current indirect constraints to Higgs invisible decay h 2 → χ0 1 χ01 are weak, but the direct detection of Higgs invisible decay at the future HL-LHC may cover half of the samples, and that of the CEPC may cover most. (v) The branching ratio of Higgs exotic decay h 2 → h 1 h 1 , a 1 a 1 can be over 20 percent, while their contributions to the invisible decay h 2 → 4χ 0 1 are very small.

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The higgsino-singlino sector of the NMSSM: Combined constraints from dark matter and the LHC

Cited by 11 publications

References 0 publications

Genuine NMSSM deviations in the 125 GeV Higgs boson decays

Genuine NMSSM deviations in the 125 GeV Higgs boson decays

Bayesian analysis of sneutrino dark matter in the NMSSM with a type-I seesaw mechanism

A Novel Scenario in the Semi-constrained NMSSM

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