Light NMSSM neutralino dark matter in the wake of CDMS II and a 126 GeV Higgs boson

The Minimal Dilaton Model (MDM) extends the Standard Model (SM) by a singlet scalar, which can be viewed as a linear realization of general dilaton field. This new scalar field mixes with the SM Higgs field to form two mass eigenstates with one of them corresponding to the 125 GeV SM-like Higgs boson reported by the LHC experiments. In this work, under various theoretical and experimental constrains, we perform fits to the latest Higgs data and then investigate the phenomenology of Higgs boson in both the heavy dilaton scenario and the light dilaton scenario of the MDM. We find that: (i) if one considers the ATLAS and CMS data separately, the MDM can explain each of them well, but refer to different parameter space due to the apparent difference in the two sets of data. If one considers the combined data of the LHC and Tevatron, however, the explanation given by the MDM is not much better than the SM, and the dilaton component in the 125-GeV Higgs is less than about 20% at 2σ level.(ii) The current Higgs data have stronger constrains on the light dilaton scenario than on the heavy dilaton scenario. (iii) The heavy dilaton scenario can produce a Higgs triple self coupling much larger than the SM value, and thus a significantly enhanced Higgs pair cross section at hadron colliders. With a luminosity of 100 fb −1 (10 fb −1 ) at the 14-TeV LHC, a heavy dilaton of 400 GeV (500 GeV) can be examined. (iv) In the light dilaton scenario, the Higgs exotic branching ratio can reach 43% (60%) at 2σ (3σ) level when considering only the CMS data, which may be detected at the 14-TeV LHC with a luminosity of 300 fb −1 and the Higgs Factory.

Section: Higgs Phenomenology In the Light Dilaton Scenariomentioning

confidence: 99%

Higgs phenomenology in the Minimal Dilaton Model after Run I of the LHC

Cao

et al. 2014

“…For samples with σ SI p 10 −9 pb, generally h 1 needs to be lighter than about 20GeV to push up the scattering rate. For the bino-like DM with mass varying from 17 GeV to 35 GeV, such a light h 1 is difficult to obtain after considering the constraint from the relic density (see figure 2). While in the Z (h SM ) resonance region, the relic density has rather weak limitation on h 1 properties.…”

Section: Resultsmentioning

confidence: 99%

“…We note that a recent study [35] tried to explain the CDMS-II results in terms of a light DM in the NMSSM. Compared to [35] which only studied three representative benchmark points, we perform a numerical scan under various experimental constraints and display the allowed parameter space in comparison with the the direct detection results of CoGeNT, CDMS-II and LUX.…”

Section: Jhep05(2014)056mentioning

confidence: 94%

“…Compared to [35] which only studied three representative benchmark points, we perform a numerical scan under various experimental constraints and display the allowed parameter space in comparison with the the direct detection results of CoGeNT, CDMS-II and LUX. We also perform a global fit of the Higgs data using the package HiggsSignals-1.0.0 [36], in which we further consider the latest LHC results of Higgs invisible decay from the channel pp → ZH [37].…”

Section: Jhep05(2014)056mentioning

confidence: 99%

See 1 more Smart Citation

A light SUSY dark matter after CDMS-II, LUX and LHC Higgs data

Cao

Han

et al. 2014

In SUSY, a light dark matter is usually accompanied by light scalars to achieve the correct relic density, which opens new decay channels of the SM-like Higgs boson. Under current experimental constraints including the latest LHC Higgs data and the dark matter relic density, we examine the status of a light neutralino dark matter in the framework of NMSSM and confront it with the direct detection results of CoGeNT, CDMS-II and LUX. We have the following observations: (i) A dark matter as light as 8 GeV is still allowed and its scattering cross section off the nucleon can be large enough to explain the CoGeNT/CDMS-II favored region; (ii) The LUX data can exclude a sizable part of the allowed parameter space, but still leaves a light dark matter viable; (iii) The SM-like Higgs boson can decay into the light dark matter pair with an invisible branching ratio reaching 30% under the current LHC Higgs data, which may be tested at the 14 TeV LHC experiment.

“…refs. [14][15][16][17][18][19][20] and references therein. 1 However, conditions for blind spots in the NMSSM have not been discussed in the literature so far.…”

Section: Introductionmentioning

confidence: 99%

Blind spots for neutralino dark matter in the NMSSM

Badziak

Olechowski

Szczerbiak

2016

Spin-independent cross-section for neutralino dark matter scattering off nuclei is investigated in the NMSSM. Several classes of blind spots for direct detection of singlinoHiggsino dark matter are analytically identified, including such that have no analog in the MSSM. It is shown that mixing of the Higgs doublets with the scalar singlet has a big impact on the position of blind spots in the parameter space. In particular, this mixing allows for more freedom in the sign assignment for the parameters entering the neutralino mass matrix, required for a blind spot to occur, as compared to the MSSM or the NMSSM with decoupled singlet. Moreover, blind spots may occur for any composition of a singlino-Higgsino LSP. Particular attention is paid to cases with the singlet-dominated scalar lighter than the 125 GeV Higgs for which a vanishing tree-level spin-independent scattering cross-section may result from destructive interference between the Higgs and the singlet-dominated scalar exchange. Correlations of the spin-independent scattering cross-section with the Higgs observables are also discussed.