Hyperfine Splitting of Excited States of New Heavy Hadrons and Low-Energy Interaction of Hadronic Dark Matter with Photons, Nucleons, and Leptons

We consider the structure of excited states and low-energy interaction of hadronic dark matter with photons, leptons, and nucleons. Description of the lowest excited levels is fulfilled in an analogy with the standard heavy-light mesons. Using the effective vertex of new heavy hadrons interaction with W-boson, we calculate cross-section of the lepton scattering on the dark matter particle. Analysis of strong low-energy interaction of new hadrons was carried out within the effective meson-exchange model based on dynamical realization of SU(3)-symmetry. A cross-section of nucleon scattering on the hadronic dark matter was also calculated using this model. The most essential phenomenological consequences of the low-energy dark matter interaction with leptons and nucleons are discussed.

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Interaction of Hadronic Dark Matter with Nucleons and Leptons

Symmetry ◽

10.3390/sym12040567 ◽

2020 ◽

Vol 12 (4) ◽

pp. 567 ◽

Cited By ~ 1

Author(s):

Vitaly Beylin ◽

Vladimir Kuksa

Keyword(s):

Dark Matter ◽

Cross Section ◽

W Boson ◽

Exchange Model ◽

Low Energy ◽

Meson Exchange ◽

Energy Scattering ◽

Matter Interaction ◽

The Cross

We analyze the low-energy Lagrangian of hadronic dark matter interaction with nucleons and leptons. The analysis was fulfilled within the framework of the effective meson-exchange model, which is based on dynamic realization of SU(3)-symmetry. Using this Lagrangian, we calculate the cross-section of low-energy scattering of nucleons on hadronic dark matter particles. Effective vertex of W-boson interaction with new hadrons is constructed and the cross-section of lepton scattering on dark matter particles is calculated.

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Detecting Cold Dark Matter Candidates

Symposium - International Astronomical Union ◽

10.1017/s0074180900150703 ◽

1987 ◽

Vol 117 ◽

pp. 490-490

Author(s):

A. K. Drukier ◽

K. Freese ◽

D. N. Spergel

Keyword(s):

Dark Matter ◽

Cold Dark Matter ◽

Galactic Halo ◽

Dark Matter Particle ◽

Low Energy ◽

The Sun ◽

Background Rate ◽

System Noise ◽

Weakly Interacting ◽

Massive Neutrinos

We consider the use of superheated superconducting colloids as detectors of weakly interacting galactic halo candidate particles (e.g. photinos, massive neutrinos, and scalar neutrinos). These low temperature detectors are sensitive to the deposition of a few hundreds of eV's. The recoil of a dark matter particle off of a superheated superconducting grain in the detector causes the grain to make a transition to the normal state. Their low energy threshold makes this class of detectors ideal for detecting massive weakly interacting halo particles.We discuss realistic models for the detector and for the galactic halo. We show that the expected count rate (≈103 count/day for scalar and massive neutrinos) exceeds the expected background by several orders of magnitude. For photinos, we expect ≈1 count/day, more than 100 times the predicted background rate. We find that if the detector temperature is maintained at 50 mK and the system noise is reduced below 5 × 10−4 flux quanta, particles with mass as low as 2 GeV can be detected. We show that the earth's motion around the Sun can produce a significant annual modulation in the signal.

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An excess radio signal in the Abell 4038 cluster

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa2895 ◽

2020 ◽

Vol 500 (4) ◽

pp. 5583-5588

Author(s):

Man Ho Chan ◽

Chak Man Lee

Keyword(s):

Dark Matter ◽

Spectral Data ◽

Cross Section ◽

Radio Signal ◽

Dark Matter Particle ◽

Cosmic Ray ◽

Annihilation Cross Section ◽

Radio Continuum ◽

Test Statistic ◽

Dark Matter Annihilation

ABSTRACT In the past decade, various instruments, such as the Large Area Telescope (LAT) on the Fermi Gamma Ray Space Telescope, the Alpha Magnetic Spectrometer (AMS) and the Dark Matter Particle Explorer(DAMPE), have been used to detect the signals of annihilating dark matter in our Galaxy. Although some excesses of gamma rays, antiprotons and electrons/positrons have been reported and are claimed to be dark matter signals, the uncertainties of the contributions of Galactic pulsars are still too large to confirm the claims. In this paper, we report on a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming a thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we obtain very large test statistic (TS) values, TS > 45, for four popular annihilation channels, which correspond to more than 6σ statistical preference. This reveals a possible potential signal of annihilating dark matter. In particular, our results are also consistent with the recent claims of dark matter mass, m ≈ 30–50 GeV, annihilating via the $\rm b\bar{b}$ quark channel with the thermal annihilation cross-section. However, at this time, we cannot exclude the possibility that a better background cosmic ray model could explain the spectral data without recourse to dark matter annihilations.

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A possible radio signal of annihilating dark matter in the Abell 4038 cluster

Monthly Notices of the Royal Astronomical Society Letters ◽

10.1093/mnrasl/slz185 ◽

2019 ◽

Vol 495 (1) ◽

pp. L124-L128 ◽

Cited By ~ 2

Author(s):

Man Ho Chan ◽

Chak Man Lee

Keyword(s):

Dark Matter ◽

Cross Section ◽

Radio Signal ◽

Dark Matter Particle ◽

Cosmic Ray ◽

Annihilation Cross Section ◽

Radio Continuum ◽

Test Statistic ◽

Large Area ◽

Dark Matter Annihilation

ABSTRACT In the past decade, some telescopes [e.g. Fermi-Large Area Telescope (LAT), Alpha Magnetic Spectrometer(AMS), and Dark Matter Particle Explorer(DAMPE)] were launched to detect the signals of annihilating dark matter in our Galaxy. Although some excess of gamma-rays, antiprotons, and electrons/positrons have been reported and claimed as dark matter signals, the uncertainties of Galactic pulsars’ contributions are still too large to confirm the claims. In this Letter, we report a possible radio signal of annihilating dark matter manifested in the archival radio continuum spectral data of the Abell 4038 cluster. By assuming the thermal annihilation cross-section and comparing the dark matter annihilation model with the null hypothesis (cosmic ray emission without dark matter annihilation), we get very large test statistic values >45 for four popular annihilation channels, which correspond to more than 6.5σ statistical preference. This provides a very strong evidence for the existence of annihilating dark matter. In particular, our results also support the recent claims of dark matter mass m ≈ 30–50 GeV annihilating via the bb̄ quark channel with the thermal annihilation cross-section.

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NEW LIMITS ON THE WIMP COLD DARK MATTER INTERACTION CROSS SECTION FROM THE UK EXPERIMENT

COSMO-97 ◽

10.1142/9789814447263_0016 ◽

1998 ◽

Author(s):

T. Ali ◽

T. J. Sumner ◽

J. J. Quenby ◽

A. Bewick ◽

N. J. T. Smith ◽

...

Keyword(s):

Dark Matter ◽

Cross Section ◽

Cold Dark Matter ◽

Interaction Cross Section ◽

Matter Interaction ◽

The Uk

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CAPTURE OF DARK MATTER BY THE SOLAR SYSTEM: SIMPLE ESTIMATES

International Journal of Modern Physics D ◽

10.1142/s0218271811018640 ◽

2011 ◽

Vol 20 (01) ◽

pp. 17-22 ◽

Cited By ~ 4

Author(s):

I. B. KHRIPLOVICH

Keyword(s):

Dark Matter ◽

Solar System ◽

Cross Section ◽

Capture Cross Section ◽

Dark Matter Particle ◽

The Sun ◽

Capture Cross ◽

The Earth ◽

Galactic Dark Matter ◽

Three Body

We consider the capture of galactic dark matter by the solar system, due to the gravitational three-body interaction of the Sun, a planet, and a dark matter particle. Simple estimates are presented for the capture cross-section, as well as for the density and velocity distributions of captured dark matter particles close to the Earth.

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Constraints on light dark matter particles using white dwarf stars

International Journal of Modern Physics D ◽

10.1142/s0218271820500583 ◽

2020 ◽

Vol 29 (08) ◽

pp. 2050058

Author(s):

Grigoris Panotopoulos ◽

Ilídio Lopes

Keyword(s):

Dark Matter ◽

Cross Section ◽

Parameter Space ◽

Globular Cluster ◽

Upper Bound ◽

White Dwarf ◽

Dark Matter Particle ◽

Dwarf Stars ◽

White Dwarf Stars ◽

Direct Dark Matter

We report constraints on the nucleon-dark matter particle cross-section using the internal luminosity of observed white dwarf stars in the globular cluster Messier 4. Our results cover the parameter space corresponding to relatively light dark matter particles, in the sub GeV range, which is known to be very difficult to be probed by direct dark matter searches. The additional luminosity coming from self-annihilations of dark matter particles captured inside the stars must not exceed the observed luminosity. Imposing that condition, we obtain for the spin independent cross-section of light dark matter particles (below 5[Formula: see text]GeV) on baryons [Formula: see text] the upper bound: [Formula: see text].

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GAUGING THE SHADOW SECTOR WITH SO(3)

Modern Physics Letters A ◽

10.1142/s0217732300001493 ◽

2000 ◽

Vol 15 (19) ◽

pp. 1221-1225 ◽

Cited By ~ 5

Author(s):

G. B. TUPPER ◽

R. J. LINDEBAUM ◽

R. D. VIOLLIER

Keyword(s):

Dark Matter ◽

Standard Model ◽

Gauge Group ◽

Cold Dark Matter ◽

Atmospheric Neutrino ◽

Dark Matter Particle ◽

Low Energy ◽

Model Based ◽

The Standard Model

We examine the phenomenology of a low-energy extension of the Standard Model, based on the gauge group SU (3) ⊗ SU (2) ⊗ U (1)⊗ SO (3), with SO(3) operating in the shadow sector. This model offers vacuum νe → νs and νμ → ντ oscillations as the solution of the solar and atmospheric neutrino problems, and it provides a neutral heavy shadow lepton X that takes the role of a cold dark matter particle.

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The Fermi–LAT Galactic Center Excess: Evidence of Annihilating Dark Matter?

Annual Review of Nuclear and Particle Science ◽

10.1146/annurev-nucl-101916-123029 ◽

2020 ◽

Vol 70 (1) ◽

pp. 455-483

Author(s):

Simona Murgia

Keyword(s):

Dark Matter ◽

Cross Section ◽

Galactic Center ◽

Dark Matter Particle ◽

Point Sources ◽

Current Status ◽

Large Area ◽

200 Gev ◽

Γ Rays ◽

Particle Nature

The center of the Galaxy is one of the prime targets in the search for a signal of annihilating (or decaying) dark matter. If such a signal were to be detected, it would shed light on one of the biggest mysteries in physics today: What is dark matter? Fundamental properties of the particle nature of dark matter, such as its mass, annihilation cross section, and annihilation final states, could be measured for the first time. Several experiments have searched for such a signal, and some have measured excesses that are compatible with it. A long-standing and compelling excess is observed in γ-rays by the Fermi Large Area Telescope ( Fermi–LAT). This excess is consistent with a dark matter particle with a mass of approximately 50 (up to ∼200) GeV annihilating with a velocity-averaged cross section of ∼10−26 cm3 s−1. Although a dark matter origin of the excess remains viable, other interpretations are possible. In particular, there is some evidence that the excess is produced by a population of unresolved point sources of γ-rays—for example, millisecond pulsars. In this article, I review the current status of the observation of the Fermi–LAT Galactic center excess, the possible interpretations of the excess, the evidence and counterevidence for each, and the prospects for resolving its origin with future measurements.

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