scholarly journals NEUTRALINO DARK MATTER ELASTIC SCATTERING IN A FLAT AND ACCELERATING UNIVERSE

2001 ◽  
Vol 16 (19) ◽  
pp. 1229-1241 ◽  
Author(s):  
A. B. LAHANAS ◽  
V. C. SPANOS ◽  
D. V. NANOPOULOS
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Elastic Scattering ◽  
Cross Section ◽  
Lower Bounds ◽  
Parameter Space ◽  
Accelerating Universe ◽  
Relic Density ◽  
Supersymmetric Models ◽  
Cosmological Data

In SUGRA inspired supersymmetric models with universal boundary conditions for the soft masses, the scalar cross-section σ scalar for the elastic neutralino–nucleon scattering is in general several orders of magnitude below the sensitivity of current experiments. For large tan β and low M1/2, m0 values, the theoretically predicted σ scalar can approach the sensitivity of these experiments (≈ 10-6 pb ) being at the same time in agreement with recent cosmological data, which impose severe restrictions on the CDM relic density, and with accelerator experiments which put lower bounds on sparticle and Higgs boson masses. Further improvement of the sensitivity of DAMA and CDMS experiments will probe the large tan β region of the parameter space in the vicinity of the boundaries of the parameter space allowed by chargino and Higgs searches.

scholarly journals SUSY DARK MATTER IN LIGHT OF CDMS/XENON LIMITS

2011 ◽  
Vol 20 (08) ◽  
pp. 1383-1388 ◽  
Author(s):  
JIN MIN YANG
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Parameter Space ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Dark Matter Relic Density ◽  
Higgs Search ◽  
Relic Density ◽  
Supersymmetric Models ◽  
Charged Higgs

We briefly review the current CDMS/XENON constraints on the neutralino dark matter in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). The constraints from the dark matter relic density and various collider experiments are also taken into account. The conclusion is that for each model the current CDMS/XENON limits can readily exclude a large part of the parameter space allowed by other constraints and the future SuperCDMS or XENON100 can cover most of the allowed parameter space. The implication for the Higgs search at the LHC is also discussed. It is found that in the currently allowed parameter space the MSSM charged Higgs boson is quite unlikely to be discovered at the LHC while the neutral Higgs bosons H and A may be accessible at the LHC in the parameter space with a large μ parameter.

scholarly journals A Comparative Study of Dark Matter in the MSSM and Its Singlet Extensions: A Mini Review

2012 ◽  
Vol 2012 ◽  
pp. 1-22 ◽  
Author(s):  
Wenyu Wang
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Comparative Study ◽  
Parameter Space ◽  
Light Neutralino ◽  
Dark Matter Relic Density ◽  
Relic Density ◽  
The Future

In this note we briefly review the recent studies of dark matter in the MSSM and its singlet extensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detection results of CDMS II, XENON, CoGeNT, and PAMELA, we find that (i) the latest detection results can exclude a large part of the parameter space which is allowed by current collider constraints in these models. The future SuperCDMS and XENON can cover most of the allowed parameter space; (ii) the singlet sector will decouple from the MSSM-like sector in the NMSSM; however, singlet sector makes the nMSSM quite different from the MSSM; (iii) the NMSSM can allow light dark matter at several GeV to exist. Light CP-even or CP-odd Higgs boson must be present so as to satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgs boson, the light neutralino dark matter can explain the CoGeNT and DAMA/LIBRA results; (iv) the general singlet extension of the MSSM gives a perfect explanation for both the relic density and the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in different scenario are also studied.

scholarly journals DARK MATTER IN THE MSSM AND ITS SINGLET EXTENSION

2010 ◽  
Vol 25 (11n12) ◽  
pp. 976-982 ◽  
Author(s):  
JIN MIN YANG
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Cross Section ◽  
Higgs Bosons ◽  
Annihilation Cross Section ◽  
Supersymmetric Model ◽  
Sommerfeld Effect ◽  
Dark Matter Relic Density ◽  
Relic Density ◽  
Minimal Supersymmetric Model

We briefly review the supersymmetric explanation for the cosmic dark matter. Although the neutralino in the minimal supersymmetric model (MSSM), the next-to-minimal supersymmetric model (NMSSM) and the nearly minimal supersymmetric model (nMSSM) can naturally explain the dark matter relic density, the PAMELA result can hardly be explained in these popular models. In the general singlet extension of the MSSM, both the PAMELA result and the relic density can be explained by the singlino-like neutralino. Such singlino-like neutralinos annihilate into the singlet-like Higgs bosons, which are light enough to decay dominantly to muons or electrons, and the annihilation cross section can be greatly enhanced by the Sommerfeld effect via exchanging a light CP-even singlet-like Higgs boson. In this scenario, in order to meet the stringent LEP constraints, the SM-like Higgs boson tends to decay into the singlet Higgs pairs instead of [Formula: see text] and consequently it will give a multi-muon signal hSM → aa → 4µ or hSM → hh → 4a → 8µ at the LHC.

scholarly journals 2HDM singlet portal to dark matter

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
M. E. Cabrera ◽  
J. A. Casas ◽  
A. Delgado ◽  
S. Robles
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Parameter Space ◽  
Direct Detection ◽  
Single Parameter ◽  
Relic Density ◽  
Relic Abundance ◽  
Higgs Portal ◽  
The Universe

Abstract Higgs portal models are the most minimal way to explain the relic abundance of the Universe. They add just a singlet that only couples to the Higgs through a single parameter that controls both the dark matter relic abundance and the direct detection cross-section. Unfortunately this scenario, either with scalar or fermionic dark matter, is almost ruled out by the latter. In this paper we analyze the Higgs-portal idea with fermionic dark matter in the context of a 2HDM. By disentangling the couplings responsible for the correct relic density from those that control the direct detection cross section we are able to open the parameter space and find wide regions consistent with both the observed relic density and all the current bounds.

scholarly journals Dark matter freeze-in from semi-production

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Andrzej Hryczuk ◽  
Maxim Laletin
Keyword(s):  
Dark Matter ◽  
Early Universe ◽  
Cross Section ◽  
Thermal Equilibrium ◽  
Indirect Detection ◽  
Production Mechanism ◽  
Number Density ◽  
Matter Production ◽  
Relic Density ◽  
Standard Formalism

Abstract We study a novel dark matter production mechanism based on the freeze-in through semi-production, i.e. the inverse semi-annihilation processes. A peculiar feature of this scenario is that the production rate is suppressed by a small initial abundance of dark matter and consequently creating the observed abundance requires much larger coupling values than for the usual freeze-in. We provide a concrete example model exhibiting such production mechanism and study it in detail, extending the standard formalism to include the evolution of dark matter temperature alongside its number density and discuss the importance of this improved treatment. Finally, we confront the relic density constraint with the limits and prospects for the dark matter indirect detection searches. We show that, even if it was never in full thermal equilibrium in the early Universe, dark matter could, nevertheless, have strong enough present-day annihilation cross section to lead to observable signals.

scholarly journals Constraining extended scalar sectors at the LHC and beyond

2018 ◽  
Vol 33 (10n11) ◽  
pp. 1830007 ◽  
Author(s):  
Agnieszka Ilnicka ◽  
Tania Robens ◽  
Tim Stefaniak
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Standard Model ◽  
Parameter Space ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Doublet Model ◽  
Inert Doublet Model ◽  
Scalar Sector ◽  
Scalar Singlet

We give a brief overview of beyond the Standard Model (BSM) theories with an extended scalar sector and their phenomenological status in the light of recent experimental results. We discuss the relevant theoretical and experimental constraints, and show their impact on the allowed parameter space of two specific models: the real scalar singlet extension of the Standard Model (SM) and the Inert Doublet Model. We emphasize the importance of the LHC measurements, both the direct searches for additional scalar bosons, as well as the precise measurements of properties of the Higgs boson of mass 125 GeV. We show the complementarity of these measurements to electroweak and dark matter observables.

scholarly journals Electroweak corrections in a pseudo Nambu-Goldstone Dark Matter model revisited

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Seraina Glaus ◽  
Margarete Mühlleitner ◽  
Jonas Müller ◽  
Shruti Patel ◽  
Tizian Römer ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Parameter Space ◽  
Goldstone Boson ◽  
Indirect Evidence ◽  
Tree Level ◽  
Dark Matter Candidate ◽  
Nucleon Scattering ◽  
The Cross ◽  
Electroweak Corrections

Abstract Having so far only indirect evidence for the existence of Dark Matter a plethora of experiments aims at direct detection of Dark Matter through the scattering of Dark Matter particles off atomic nuclei. For the correct interpretation and identification of the underlying nature of the Dark Matter constituents higher-order corrections to the cross section of Dark Matter-nucleon scattering are important, in particular in models where the tree-level cross section is negligibly small. In this work we revisit the electroweak corrections to the dark matter-nucleon scattering cross section in a model with a pseudo Nambu-Goldstone boson as the Dark Matter candidate. Two calculations that already exist in the literature, apply different approaches resulting in different final results for the cross section in some regions of the parameter space leading us to redo the calculation and analyse the two approaches to clarify the situation. We furthermore update the experimental constraints and examine the regions of the parameter space where the cross section is above the neutrino floor but which can only be probed in the far future.

scholarly journals INTERPRETING THE BOUNDS ON SOLAR DARK MATTER INDUCED MUONS AT SUPER-KAMIOKANDE IN THE LIGHT OF CDMS RESULTS

2010 ◽  
Vol 25 (18n19) ◽  
pp. 3741-3747
Author(s):  
ABHIJIT BANDYOPADHYAY ◽  
SOVAN CHAKRABORTY ◽  
DEBASISH MAJUMDAR
Keyword(s):  
Dark Matter ◽  
Elastic Scattering ◽  
Cross Section ◽  
Enhancement Factor ◽  
Scattering Cross Section ◽  
The Sun ◽  
Detection Rates ◽  
Scattering Cross ◽  
Elastic Scattering Cross Section ◽  
Upper Limits

We consider the recent limits on dark matter–nucleon elastic scattering cross-section from the analysis of CDMS II collaboration using the two signal events observed in CDMS experiment. With these limits we try to interpret the super-Kamiokande (SK) bounds on the detection rates of up-going muons induced by the neutrinos that are produced in the sun from the decay of annihilation products of dark matter (WIMP's) captured in the solar core. Calculated rates of up-going muons for different annihilation channels at SK using CDMS bounds are found to be orders below the predicted upper limits of such up-going muon rates at SK. Thus there exists room for enhancement (boost) of the calculated rates using CDMS limits for interpreting SK bounds. Such a feature is expected to represent the PAMELA data with the current CDMS limits. We also show the dependence of such a possible enhancement factor (boost) on WIMP mass for different WIMP annihilation channels.

scholarly journals ENHANCEMENT OF CHARGED HIGGS PRODUCTION IN ASSOCIATION WITH W± AT MUON COLLIDERS IN GENERAL TWO HIGGS DOUBLET MODELS

2012 ◽  
Vol 27 (28) ◽  
pp. 1250165 ◽  
Author(s):  
M. HASHEMI
Keyword(s):  
Higgs Boson ◽  
Cross Section ◽  
Parameter Space ◽  
Mass Parameter ◽  
Higgs Doublet ◽  
Higgs Production ◽  
Boson Mass ◽  
Charged Higgs ◽  
The Cross ◽  
Muon Colliders

The charged Higgs production associated with a W± boson has a smooth cross-section as a function of the charged Higgs mass at muon colliders. The cross-section in minimal supersymmetric standard model (MSSM) is about 25 fb in the range 200 GeV < mH± <400 GeV with tan β = 50. This is much larger than the corresponding cross-section at an e+e- collider which reaches a fraction of femtobarn. The observability of this charged Higgs production at a muon collider has been recently studied in an earlier work leading to the result that with 1 ab-1, a 5σ signal can be observed throughout the aforementioned mass range. In this paper, results of a study based on a general two Higgs doublet model (types II and III) are presented and the cross-section of the charged Higgs production in the most sensitive parameter space is evaluated. It is concluded that the cross-section increases with increasing neutral Higgs boson masses involved in the s-channel diagram and can be as large as several picobarn with tan β = 50. The region of "physical Higgs boson mass" parameter space which could lead to a 5σ signal at 50 fb-1 is specified.

scholarly journals SUSY AND DARK MATTER CONSTRAINTS FROM THE LHC

2007 ◽  
Vol 22 (31) ◽  
pp. 5771-5784 ◽  
Author(s):  
M. J. WHITE
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Parameter Measurement ◽  
Relic Density ◽  
Prospect Of Success

The LHC will have much to say about the mysteries of dark matter, and this talk reviews this potential within the context of supersymmetry (SUSY). The SUSY search reach of CMS and ATLAS is presented, followed by a brief introduction to the methods of SUSY parameter measurement. A representative ATLAS study is then used to explain how the LHC can be used to obtain a measurement of the relic density of a neutralino WIMP candidate. Finally, the prospect of success is considered by looking at different points in the MSSM parameter space.

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