Light neutralino dark matter in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>U</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>models

Frank, Mariana; Mondal, Subhadeep

doi:10.1103/physrevd.90.075013

Cited by 11 publications

(7 citation statements)

References 108 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Detailed studies have already been carried out for this particular channel. For example, h → γγ is studied in a wide variety of supersymmetric (SUSY) models namely, the minimal supersymmetric standard model (MSSM) , its next-to-minimal version (NMSSM) [27][28][29][30][31][32][33][34][35], the constrained MSSM (CMSSM) [36][37][38][39][40][41] and also in (B-L)SSM [42][43][44][45], µνSSM [46], left-right supersymmetric models [47], and in U(1) ′ extension of MSSM [48]. In [49], a triplet-singlet extension of MSSM has been studied and µ γγ is computed.…”

Section: Jhep02(2015)124mentioning

confidence: 99%

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

View full text Add to dashboard Cite

We perform a detailed study of the signal rate of the lightest Higgs boson in the diphoton channel (µ γγ ), recently analyzed by both the ATLAS and CMS collaborations at the Large Hadron Collider, in the framework of U(1) R − lepton number model with a right handed neutrino superfield. The corresponding neutrino Yukawa coupling, 'f ', plays a very important role in the phenomenology of this model. A large value of f ∼ O(1) provides an additional tree level contribution to the lightest Higgs boson mass along with a very light (mass ∼ a few hundred MeV) bino like neutralino and a small tree level mass of one of the active neutrinos that is compatible with various experimental results. In the presence of this light neutralino, the total decay width of the Higgs boson and its various branching fractions are affected. When studied in conjunction with the recent LHC results, these put significant constraints on the parameter space. The signal rate µ γγ obtained in this scenario is compatible with the recent results from both the ATLAS and the CMS collaborations at 1σ level. A small value of 'f ', on the other hand, is compatible with a sterile neutrino acting as a 7 keV dark matter that can explain the observation of a mono-energetic X-ray photon line by the XMM-Newton X-ray observatory. Because of the absence of a light neutralino, the total decay width of the lightest Higgs boson in this case remains close to the SM expectation. Hence, in the small 'f ' scenario we obtain a relatively larger value of µ γγ which is closer to the central values reported recently by these two collaborations.

show abstract

Section: Jhep02(2015)124mentioning

confidence: 99%

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…In this section, we describe the simplified dark matter model we use in our analysis. Majorana fermions recently emerged as the most plausible dark matter particle candidates in the simplified model context [80,[122][123][124][127][128][129][130][131]. Motivated by this, we assume that dark matter consists of a single Majorana fermion, which we denote by χ. Additionally, motivated by the listed literature and the Higgs portal, we assume that the interaction between the dark matter particle and standard fermions is mediated by a scalar particle S [132,133].…”

Section: The Dark Matter Modelmentioning

confidence: 99%

Dark matter properties implied by gamma ray interstellar emission models

Balázs

2017

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

We infer dark matter properties from gamma ray residuals extracted using eight different interstellar emission scenarios proposed by the Fermi-LAT Collaboration to explain the Galactic Center gamma ray excess. Adopting the most plausible simplified ansatz, we assume that the dark matter particle is a Majorana fermion interacting with standard fermions via a scalar mediator. Using this theoretical hypothesis and the Fermi residuals we calculate Bayesian evidences, including Fermi-LAT exclusion limits from 15 dwarf spheroidal galaxies as well. Our Bayes factors single out four of the Fermi scenarios as compatible with the simplified dark matter model. In the most preferred scenario the dark matter (mediator) mass is in the 100-500 (1-200) GeV range and its annihilation is dominated by top quark final state. Less preferred but still plausible is annihilation into bb and τ + τ − final states with an order of magnitude lower dark matter mass.Our conclusion is that the properties of dark matter extracted from gamma ray data are highly sensitive to the modeling of the interstellar emission.

show abstract

“…In the recent literature it was shown that Majorana fermions are one of the most plausible dark matter candidates [42][43][44][45][46][47][48][49].…”

Section: Jhep05(2016)033mentioning

confidence: 99%

AMS-02 fits dark matter

Balázs

2016

J. High Energ. Phys.

View full text Add to dashboard Cite

In this work we perform a comprehensive statistical analysis of the AMS-02 electron, positron fluxes and the antiproton-to-proton ratio in the context of a simplified dark matter model. We include known, standard astrophysical sources and a dark matter component in the cosmic ray injection spectra. To predict the AMS-02 observables we use propagation parameters extracted from observed fluxes of heavier nuclei and the low energy part of the AMS-02 data. We assume that the dark matter particle is a Majorana fermion coupling to third generation fermions via a spin-0 mediator, and annihilating to multiple channels at once. The simultaneous presence of various annihilation channels provides the dark matter model with additional flexibility, and this enables us to simultaneously fit all cosmic ray spectra using a simple particle physics model and coherent astrophysical assumptions. Our results indicate that AMS-02 observations are not only consistent with the dark matter hypothesis within the uncertainties, but adding a dark matter contribution improves the fit to the data. Assuming, however, that dark matter is solely responsible for this improvement of the fit, it is difficult to evade the latest CMB limits in this model.

show abstract

Light neutralino dark matter inU(1)′models

Cited by 11 publications

References 108 publications

h → γγ in U(1) R -lepton number model with a right-handed neutrino

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Dark matter properties implied by gamma ray interstellar emission models

AMS-02 fits dark matter

Contact Info

Product

Resources

About