Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The Search for Dark Matter Annihilation Signals in Neutrino Detectors
Author: Indirect Dark Matter Search with Neutrinos in JUNO and THEIA
Author: David Samuel BlumPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Extensive evidence from various astrophysical observations suggests that most of the matter in the universe is dark matter. However, the nature of dark matter is still unknown and remains one of the most prominent unanswered questions in physics today. A potential way to search for dark matter is the indirect dark matter search with neutrinos. It is based on the hypothesis that dark matter particles self-annihilate into neutrinos. This would result in a neutrino flux, which could be measured by neutrino detectors at Earth. In case of no excess signal is observed, a limit on the dark matter self-annihilation cross section can be set. The future neutrino detectors JUNO and THEIA can search for dark matter, especially for light dark matter particles with masses ranging from MeV to GeV. The search for such light dark matter particles has gained in importance in the last years as it extends the typical WIMP search to the sub-GeV mass range. In this work, the sensitivities of JUNO and THEIA to measure neutrinos from dark matter self-annihilation in the Milky Way as an excess over backgrounds are determined in detail for the first time. The work focuses on direct self-annihilation of light dark matter particles with masses ranging from 15 MeV to 100 MeV into neutrino-antineutrino pairs. The expected electron antineutrino signal measured through the inverse beta decay (IBD) reaction and all background contributions occurring in the visible energy region from 10 MeV to 100 MeV are determined for both detectors. To effectively reduce IBD-like background events of atmospheric neutrinos interacting via neutral current and of fast neutrons in JUNO, pulse shape discrimination is studied and applied in this work. THEIA would feature the separate measurement of Cherenkov and scintillation light. As a consequence, selection cuts on the ratio of measured Cherenkov to scintillation light and on the number of reconstructed Cherenkov rings are determined in this work, which can suppress atmospheric neutral current and fast neutron background events in THEIA with high efficiency. The sensitivities of JUNO and THEIA are determined using a Bayesian analysis and Markov Chain Monte Carlo sampling for dark matter masses ranging from 15 MeV to 100 MeV. JUNO will achieve the highest sensitivity for indirect dark matter search with neutrinos among existing neutrino detectors and will take a leading role in the indirect dark matter search in the upcoming years. The results of this work show for the first time that JUNO will improve the best currently existing 90 % C.L. upper limit of neutrino detectors on the dark matter self-annihilation cross section by a factor of 2 to 9 for 10 years of data taking. JUNO's potential to discover an electron antineutrino signal from dark matter self-annihilation in the Milky Way as an excess over backgrounds will be between 3 sigma and 5 sigma for most dark matter masses from 15 MeV to 100 MeV assuming an annihilation cross section that corresponds to the 90 % C.L. upper limit on the annihilation cross section of Super-K. This work moreover demonstrates that THEIA, if realized, could achieve a sensitivity comparable to JUNO.
Neutrino Signals from Dark Matter
Author: Arif Emre ErkocaPublisher:
ISBN:
Category :
Languages : en
Pages : 356
Book Description
Large-scale neutrino telescopes will be powerful toolsto observe multitude of mysterious phenomena happening in the Universe. The dark matter puzzle is listed as one of them. In this study, indirect detection of dark matter vianeutrino signals is presented. The upward muon, the contained muonand the hadronic shower fluxesare calculated, assuming annihilation/decay of the dark matter in thecore of the astrophysical objects and in the Galactic center. Direct neutrino production and secondary neutrino production from thedecay of Standard Model particles produced in the annihilation/decay of dark matter are studied. The results are contrastedto the ones previously obtained in the literature, illustrating the importance of properly treating muon propagation andenergy loss for the upward muon flux. The dependence ofthe dark matter signals on the density profile, the dark matter mass and the detector threshold are discussed. Different dark matter models (gravitino, Kaluza-Klein and leptophilic) which can account for recent observations ofsome indirect searchesare analyzed regarding their detection in the kilometer size neutrino detectors in the near future. Muon and shower rates and the minimum observation times in orderto reach 2.
Low Temperature Detectors for Neutrinos and Dark Matter II
Author: Luis Gonzalez-MestresPublisher: Atlantica Séguier Frontières
ISBN: 9782863320594
Category : Cryoelectronics
Languages : en
Pages : 534
Book Description
Dark Matter, Neutrinos, and Our Solar System
Author: Nirmala PrakashPublisher: World Scientific
ISBN: 9814304530
Category : Science
Languages : en
Pages : 674
Book Description
This book describes these issues in terms of links, between cosmology, particle and nuclear physics, as well as between cosmology, atmospheric and terrestrial physics. It studies the constituents of dark matter (classified as hot warm and cold) first in terms of their individual structures, and second, in terms of facilities available to detect these structures. Neutrinos are treated as a separate entity. The last chapter details the real-time stories about the "regions" that were not explored thus far, for lack of advanced technology. Their untold stories (which span up to 2010) are illustrated here datewise in full. The book concludes with the latest news that the Large Hadron Collider team at CERN has finally succeeded in producing 7 trillion electronic Volts of energy by creating head-on-collisions of protons and more protons (in search of God-particle).
Low Temperature Detectors for Neutrinos and Dark Matter
Author: Klaus PretzlPublisher: Springer Science & Business Media
ISBN: 3642729592
Category : Technology & Engineering
Languages : en
Pages : 169
Book Description
For the last few years astrophysicists and elementary particle physicists have been working jointly on the following fascinating phenomena: 1. The solar neutrino puzzle and the question: What happens to the neutrinos on their way from the sun to the earth? 2. The growing evidence that our universe is filled with about 10 times more matter than is visible and the question: What is dark matter made of? 3. The supernovae explosions and the question: What do neutrinos tell us about such explosions and vice versa? The experimental investigation of these phenomena is difficult and involves unconventional techniques. These are presently under development, and bring together such seemingly disparate disciplines as astrophysics and elementary particle physics on the one hand and superconductivity and solid-state physics on the other. This book contains the proceedings of a workshop held in March 1987 at which the above subjects and their experimental investigation were discussed. The proposed experimental methods are very new. They involve frontier developments in low temperature and solid-state physics. The book should be useful to researchers and students who actively work on these subjects or plan to enter the field. It also offers the non-expert reader with some physics background a good survey of the activities in this field.
Limits to Dark Matter Annihilation Cross-section from a Combined Analysis of MAGIC and Fermi-LAT Observations of Dwarf Satellite Galaxies
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We present the first joint analysis of gamma-ray data from the MAGIC Cherenkov telescopes and the Fermi Large Area Telescope (LAT) to search for gamma-ray signals from dark matter annihilation in dwarf satellite galaxies. We combine 158 hours of Segue 1 observations with MAGIC with 6-year observations of 15 dwarf satellite galaxies by the Fermi-LAT. We obtain limits on the annihilation cross-section for dark matter particle masses between 10 GeV and 100 TeV - the widest mass range ever explored by a single gamma-ray analysis. These limits improve on previously published Fermi-LAT and MAGIC results by up to a factor of two at certain masses. Our new inclusive analysis approach is completely generic and can be used to perform a global, sensitivity-optimized dark matter search by combining data from present and future gamma-ray and neutrino detectors.
Probing Particle Physics With Neutrino Telescopes
Author: Carlos Perez De Los HerosPublisher: World Scientific
ISBN: 9813275030
Category : Science
Languages : en
Pages : 433
Book Description
This book introduces the reader to how fundamental topics in particle physics can be studied with the largest neutrino telescopes currently in operation. Due to their large size, reaching cubic-kilometer volumes, and their wide energy response, these unusual detectors can provide insight on neutrino oscillations, dark matter searches or searches for exotic particles, new neutrino interactions or extra dimensions, among many other topics.Lacking a man-made neutrino 'beam', neutrino telescopes use the copious flux of neutrinos continuously produced by cosmic rays interacting in the Earth's atmosphere, as well as neutrinos from astrophysical origin. They have therefore access to neutrinos of higher energies and much longer baselines than those produced in present accelerators, being able to search for new physics at complementary scales than currently available in particle physics laboratories around the world.Written by carefully chosen experts in the field, the book introduces each topic in a pedagogical way apt not only to professionals, but also to students or the interested reader with a background in physics.
Improvements to the Calculation of Indirect Signals of Diffuse Gamma-rays and Neutrinos from Dark Matter Annihilation
Author: Sheldon Scott CampbellPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A new formalism is presented for calculating the mean intensity spectrum and angular power spectrum of gamma-rays or neutrinos from extragalactic annihilating dark matter, taking into account the dependence of the relative motions of the annihilating particles on the annihilation cross section. To model the large scale dark matter distribution of mass and relative velocities, the halo distribution model is comprehensively summarized, and extended to include a universal radial profile of the particles' velocity variance, based on results from N-body computer simulations of dark matter halos. A velocity variance profile, associated with the NFW density profile, is proposed by enforcing a power-law profile of the pseudo phase-space density. This allows the large-scale velocity distribution to be described by virialized, gravitationally bound dark matter halos, as opposed to thermal motions used to describe the velocity distribution in the early Universe. The recent particle motion history of the Universe is presented for the described model. Sample extragalactic gamma-ray intensities from dark matter annihilation are shown for dark matter annihilating with p-wave, according to a relative-velocity-weighted annihilation cross section sigmav = a + bv^2, for constants a and b, with examples taken from supersymmetric models. For thermally produced dark matter, the p-wave suppresses the signal intensity. If b/a> 10^6, the p-wave hardens the intensity spectrum by an estimated factor of 1 + (6b/a)delta_I (E_gamma), and increases the angular power spectrum by a factor also depending on new coefficients (delta_Cl)^(1) (E_gamma) and (delta_Cl)^(2) (E_gamma). The energy-dependence of the new p-wave coefficients delta_I, (delta_Cl)^(1) (E_gamma), and (delta_Cl)^(2) (E_gamma) are shown for various annihilation spectra. Sample intensity spectra are also presented for Sommerfeld-enhanced annihilation. The intensity of neutrinos from dark matter annihilation is also considered. The variations between the dark matter annihilation signals for different particle phenomenologies suggest that particle physics constraints are possible from an observed indirect detection signal. Calculations of the annihilation signal from the galactic halo are also shown. The extragalactic signal's intensity is found to be consistent in magnitude with the galactic intensity?within the uncertainty of the models of the dark matter distribution?when looking out from the galactic plane. This suggests that the total cosmic signal may have significant contributions from both components.
Particle Dark Matter
Author: Gianfranco BertonePublisher: Cambridge University Press
ISBN: 0521763681
Category : Science
Languages : en
Pages : 763
Book Description
Describes the dark matter problem in particle physics, astrophysics and cosmology for graduate students and researchers.