Implications of Recent Nucleon Spin Structure Measurements for Neutralino Dark Matter Detection (original) (raw)

Update of the direct detection of dark matter and the role of the nuclear spin

Physical Review D, 2001

We update our exploration of the minimal supersymmetric standard model 共MSSM兲 parameter space at the weak scale where new accelerator and cosmological constraints are respected. The dependence of weakly interacting massive particle nucleon cross sections on parameters of the MSSM, uncertainties of the nucleon structure and other theoretical assumptions such as universality and coannihilation are considered. In particular, we find that the coannihilation does not have a significant effect on our analysis in certain regions which are allowed even with coannihilation. The new cosmological constraint on the relic neutralino density used in the form 0.1⬍⍀ ␹ h 2 0 ⬍0.3 also does not significantly affect the regions of allowed neutralino-nucleon cross sec- tions. We notice that for nuclear targets with spin the spin-dependent interaction may determine the lower bound for the direct detection rate when the cross section of the scalar interaction drops below about 10 ⫺12 pb.

On the neutralino as dark matter candidate. II. Direct detection

Astroparticle Physics, 1994

Evaluations of the event rates relevant to direct search for dark matter neutralino are presented for a wide range of neutralino masses and for various detector materials of preeminent interest. Differential and total rates are appropriately weighted over the local neutralino density expected on theoretical grounds.

Nuclear uncertainties in the spin-dependent structure functions for direct dark matter detection

Physical Review D, 2013

We study the effect that uncertainties in the nuclear spin-dependent structure functions have in the determination of the dark matter (DM) parameters in a direct detection experiment. We show that different nuclear models that describe the spin-dependent structure function of specific target nuclei can lead to variations in the reconstructed values of the DM mass and scattering cross section. We propose a parametrization of the spin structure functions that allows us to treat these uncertainties as variations of three parameters, with a central value and deviation that depend on the specific nucleus. The method is illustrated for germanium and xenon detectors with an exposure of 300 kg yr, assuming a hypothetical detection of DM and studying a series of benchmark points for the DM properties. We find that the effect of these uncertainties can be similar in amplitude to that of astrophysical uncertainties, especially in those cases where the spin-dependent contribution to the elastic scattering cross section is sizable.

Indirect Searches for Dark Matter Signatures at INO

Journal of Physics: Conference Series

Neutrino fluxes could arise due to annihilation of Weakly Interactive Massive Particles (WIMPs) in the center of the sun. We study the prospects of search for muon events due to such neutrinos at the upcoming Iron CALorimeter (ICAL) detector to be housed at Indiabased Neutrino Observatory (INO). Although the atmospheric neutrinos will pose a serious background to the signal neutrinos produced through WIMP annihilation, the former could be supressed significantly by using the directional property of signal neutrinos. For 50kt × 10 years of ICAL running and WIMP masses (mχ) between 3-100 GeV, we perform a χ 2 analysis and present expected exclusion regions in the σ SD − m χ and σ SI − m χ plane, where σ SD and σSI are the WIMP-nucleon Spin-Dependent (SD) and Spin-Independent (SI) scattering crosssections, respectively. For m χ = 25 GeV, the expected 90 % C.L. exclusion limit on σ SD are σSD < 7.82 × 10 −41 cm 2 for τ + τ − channel and σSD < 1.23 × 10 −39 cm 2 for bb channel. For same m χ , the expected 90 % C.L. exclusion limits on σ SI are σ SI < 8.97 × 10 −43 cm 2 for τ + τ − channel and σ SI < 1.43 × 10 −41 cm 2 for bb channel.

Dark Matter Detection in the Light of Recent Experimental Results

International Journal of Modern Physics A, 2004

The existence of dark matter was suggested, using simple gravitational arguments, seventy years ago. Although we are now convinced that most of the mass in the Universe is indeed some nonluminous matter, we still do not know its composition. The problem of the dark matter in the Universe is reviewed here. Particle candidates for dark matter are discussed with particular emphasis on Weakly Interacting Massive Particles (WIMP's). Experiments searching for these relic particles, carried out by many groups around the world, are also reviewed, paying special attention to their direct detection by observing the elastic scattering on target nuclei through nuclear recoils. Finally, we concentrate on the theoretical models predicting WIMP's, and in particular on supersymmetric extensions of the standard model, where the leading candidate for WIMP, the neutralino, is present. There, we compute the cross-section for the direct detection of neutralinos, and compare it with the sensitivi...

Direct detection of supersymmetric dark matter and the role of the target nucleus spin

Physical Review D, 1994

We investigate the role of nuclear spin in elastic scattering of Dark Matter (DM) neutralinos from nuclei in the framework of the Minimal SUSY standard model (MSSM). The relative contribution of spindependent axial-vector and spin-independent scalar interactions to the event rate in a DM detector has been analyzed for various nuclei. Within general assumptions about the nuclear and nucleon structure we find that for nuclei with atomic weights A > 50 the spin-independent part of the event rate R si is larger than the spin-dependent one R sd in the domain of the MSSM parameter space allowed by the known experimental data and where the additional constraint for the total event rate R = R sd + R si > 0.01 is satisfied. The latter reflects realistic sensitivities of present and near future DM detectors. Therefore we expect equal chances for discovering the DM event either with spin-zero or with spin-non-zero isotopes if their atomic weights are A 1 ∼ A 2 > 50.

A General Analysis of Direct Dark Matter Detection: From Microphysics to Observational Signatures

Beginning with a set of simplified models for spin-0, spin-$\half$, and spin-1 dark matter candidates using completely general Lorentz invariant and renormalizable Lagrangians, we derive the full set of non-relativistic operators and nuclear matrix elements relevant for direct detection of dark matter, and use these to calculate rates and recoil spectra for scattering on various target nuclei. This allows us to explore what high energy physics constraints might be obtainable from direct detection experiments, what degeneracies exist, which operators are ubiquitous and which are unlikely or sub-dominant. We find that there are operators which are common to all spins as well operators which are unique to spin-$\half$ and spin-1 and elucidate two new operators which have not been previously considered. In addition we demonstrate how recoil energy spectra can distinguish fundamental microphysics if multiple target nuclei are used. Our work provides a complete roadmap for taking generic ...

General analysis of direct dark matter detection: From microphysics to observational signatures

Physical Review D, 2015

Beginning with a set of simplified models for spin-0, spin-1 2 , and spin-1 dark matter candidates using completely general Lorentz invariant and renormalizable Lagrangians, we derive the full set of non-relativistic operators and nuclear matrix elements relevant for direct detection of dark matter, and use these to calculate rates and recoil spectra for scattering on various target nuclei. This allows us to explore what high energy physics constraints might be obtainable from direct detection experiments, what degeneracies exist, which operators are ubiquitous and which are unlikely or subdominant. We find that there are operators which are common to all spins as well operators which are unique to spin-1 2 and spin-1 and elucidate two new operators which have not been previously considered. In addition we demonstrate how recoil energy spectra can distinguish fundamental microphysics if multiple target nuclei are used. Our work provides a complete roadmap for taking generic fundamental dark matter theories and calculating rates in direct detection experiments. This provides a useful guide for experimentalists designing experiments and theorists developing new dark matter models.

Neutralino Proton Cross Section and Dark Matter Detection

COSMO-2000, 2001

We consider the neutralino proton cross section for detection of Milky Way dark matter for a number of supergravity models with gauge unification at the GUT scale: models with universal soft breaking (mSUGRA), models with nonuniversal soft breaking, and string inspired D-brane models. The parameter space examined includes m 1/2 <1 TeV and tan β < 50, and the recent Higgs bound of m h >114 GeV is imposed. (For grand unified models, this bound is to be imposed for all tan β.) All coannihilation effects are included as well as the recent NLO corrections to b → sγ for large tan β, and coannihilation effects are shown to be sensitive to A 0 for large tan β. In all models, current detectors are sampling parts of the paramater space i. e. tan β > ∼ 25 for mSUGRA, tan β > ∼ 7 for nonuniversal models, and tan β > ∼ 20 for D-brane models. Future detectors should be able to cover almost the full parameter space for µ > 0. For µ < 0, cancellations can occur for m 1/2 > ∼ 450 GeV, allowing the cross sections to become < ∼ 10 −10 pb for limited ranges of tan β. (The positions of these cancellations are seen to be sensitive to the value of σ πN .) In this case, the gluino and squarks lie above 1 TeV, but still should be accessible to the LHC if m 1/2 < 1 TeV.

Direct detection of neutralino dark matter in the NMSSM

Journal of Physics: Conference Series, 2006

The direct detection of neutralino dark matter is analysed in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). Sizable values for the neutralino detection cross section, within the reach of dark matter detectors, are attainable, due to the exchange of very light Higgses, which have a significant singlet composition. The lightest neutralino exhibits a large singlino-Higgsino composition, and a mass in the range 50 < ∼ mχ0