A Search for Signatures of Dark Matter in the AMS-01 Electron and Antiproton Spectrum PDF Download
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Author: Gianpaolo Patrick Carosi Publisher: ISBN: Category : Languages : en Pages : 93
Book Description
If dark matter consists of Weakly Interacting Massive Particles (WIMPs), such as the supersymmetric neutralino, various theories predict that their annihilation in the galaxy can give rise to anomalous features in the otherwise smooth spectra of charged cosmic rays. Up to now searches for these spectral anomalies have focused largely on antiparticles (p, e+) due to their lower astrophysical backgrounds. In this thesis we present results of a search for dark matter annihilation in the charge Z = -1 spectrum of AMS-01 (essentially electrons and antiprotons). To avoid model dependent complications we assume that the primary annihilation channel is through W+W- production. We use the galactic propagation software GALPROP to determine the dark matter spectra at Earth from a smooth isothermal source. Fits to the data did not reveal any contribution from dark matter and limits were placed on the rate of W+W- production in the galaxy and on the corresponding cross-section for WIMP annihilation through the W+W- channel (given a smooth isothermal distribution).
Author: Gianpaolo Patrick Carosi Publisher: ISBN: Category : Languages : en Pages : 93
Book Description
If dark matter consists of Weakly Interacting Massive Particles (WIMPs), such as the supersymmetric neutralino, various theories predict that their annihilation in the galaxy can give rise to anomalous features in the otherwise smooth spectra of charged cosmic rays. Up to now searches for these spectral anomalies have focused largely on antiparticles (p, e+) due to their lower astrophysical backgrounds. In this thesis we present results of a search for dark matter annihilation in the charge Z = -1 spectrum of AMS-01 (essentially electrons and antiprotons). To avoid model dependent complications we assume that the primary annihilation channel is through W+W- production. We use the galactic propagation software GALPROP to determine the dark matter spectra at Earth from a smooth isothermal source. Fits to the data did not reveal any contribution from dark matter and limits were placed on the rate of W+W- production in the galaxy and on the corresponding cross-section for WIMP annihilation through the W+W- channel (given a smooth isothermal distribution).
Author: Roberto Battiston Publisher: World Scientific ISBN: 9814487775 Category : Science Languages : en Pages : 269
Book Description
This book presents the progress in cosmic ray physics following the recent results obtained by balloon, satellite and underground experiments. The following topics are reviewed: Composition and propagation of cosmic rays, trapping of charged particles in the earth's magnetic field, atmospheric neutrinos, and high energy photon measurements in space.
Author: Mehr Un Nisa Publisher: ISBN: Category : Languages : en Pages : 178
Book Description
"Astrophysical observations are central to the quest for new physics including the search for dark matter. The search is based on identifying potential deviations from the Standard Model in the cosmic-ray and the electromagnetic spectrum of astrophysical sources. The deviations could either be signatures of dark matter or have consequences for our understanding of known sources. The last decade of precision measurements from detectors in space, such as the Fermi Gamma-ray Space Telescope, and the Alpha Magnetic Spectrometer for detecting cosmic rays aboard the International Space Station, have identified certain "anomalies" or unexpected spectral features, that challenge the standard models of how cosmic rays are produced and propagate through the Galaxy. Examples include an unexpectedly hard spectrum of cosmic-ray antiprotons at energies above a few hundred GeV, and an unexplained excess of very-high-energy gamma rays from the Sun. An excess of cosmic-ray antiprotons and a hard spectrum of gamma rays from the Sun also feature in the predictions of various models of dark matter annihilation. However, without a complete understanding of the antiproton spectrum, and the production mechanisms of solar gamma rays, it is impossible to differentiate new physics from the standard astrophysical foreground flux of these particles. Measuring these fluxes at energies that extend into the TeV range is an observational challenge that we explore in this thesis. The High AltitudeWater Cherenkov (HAWC) Observatory is a wide field-of-view array that is currently the only detector capable of making high-statistics measurements of cosmic rays and gamma rays at multi-TeV energies. This work uses data from HAWC collected between 2014-2017 to constrain two unique fluxes at the TeV scale: antiprotons in Galactic cosmic rays, and gamma rays from the quiescent Sun - both relevant foregrounds for astrophysical searches for physics beyond the Standard Model. Cosmic rays in the inner solar system are subject to deflection by the magnetic fields of the Earth and the Sun, affecting the observed deficit or "shadow" of the Moon/Sun. Cosmic rays also interact with the Sun's atmosphere to produce a steady emission of gamma rays up to at least 200 GeV, though the exact underlying mechanism remains a puzzle. We present the strongest upper limits on the antiproton to proton ratio in TeV cosmic rays at ~1% using the Moon shadow as a momentum/ charge discriminant. We also discuss our search for excess gamma rays from the Sun above 1 TeV, and present the resulting implications for models of dark matter capture and annihilation in the Sun. Our results constrain the steady gamma-ray emission from the Sun up to a few times 10−12 TeV cm−2 s−1 at 1 TeV. For dark matter annihilation with long-lived mediators in the Sun, we present the strongest upper limits on dark matter-proton scattering cross section up to ~10−45 cm2, which is a potential improvement of four orders of magnitude compared to direct-detection experiments for dark matter mass of 1 TeV."--Pages xi-xii.
Author: Enrico Morgante Publisher: Springer ISBN: 3319676067 Category : Science Languages : en Pages : 223
Book Description
This thesis covers several theoretical aspects of WIMP (weakly interacting massive particles) dark matter searches, with a particular emphasis on colliders. It mainly focuses on the use of effective field theories as a tool for Large Hadron Collider (LHC) searches, discussing in detail the issue of their validity, and on simplified dark matter models, which are receiving a growing attention from the physics community. It highlights the theoretical consistency of simplified models, which is essential in order to correctly exploit their potential and for them to be a common reference when comparing results from different experiments. This thesis is of interest to researchers (both theorists and experimentalists) in the field of dark matter searches, and offers a comprehensive introduction to dark matter and to WIMP searches for students and non-experts.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Measurements of the cosmic ray antiproton spectrum can be used to search for contributions from annihilating dark matter and to constrain the dark matter annihilation cross section. Depending on the assumptions made regarding cosmic ray propagation in the Galaxy, such constraints can be quite stringent. We revisit this topic, utilizing a set of propagation models fit to the cosmic ray boron, carbon, oxygen and beryllium data. We derive upper limits on the dark matter annihilation cross section and find that when the cosmic ray propagation parameters are treated as nuisance parameters (as we argue is appropriate), the resulting limits are significantly less stringent than have been previously reported. We also note (as have several previous groups) that simple GALPROP-like diffusion-reacceleration models predict a spectrum of cosmic ray antiprotons that is in good agreement with PAMELA's observations above ~ 5 GeV, but that significantly underpredict the flux at lower energies. Although the complexity of modeling cosmic ray propagation at GeV-scale energies makes it difficult to determine the origin of this discrepancy, we consider the possibility that the excess antiprotons are the result of annihilating dark matter. Suggestively, we find that this excess is best fit for mDM ~ 35 GeV and [sigma] v ~ 10$-$26 cm3/s (to $b\bar{_b}$), in good agreement with the mass and cross section previously shown to be required to generate the gamma-ray excess observed from the Galactic Center.
Author: Alain Mazure Publisher: Springer Science & Business Media ISBN: 144198822X Category : Science Languages : en Pages : 188
Book Description
For over ten years, the dark side of the universe has been headline news. Detailed studies of the rotation of spiral galaxies, and 'mirages' created by clusters of galaxies bending the light from very remote objects, have convinced astronomers of the presence of large quantities of dark (unseen) matter in the cosmos. The most striking fact is that they seem to compromise about 95% of the matter/energy content of the universe. As for ordinary matter, although we are immersed in a sea of dark particles, including primordial neutrinos and photons from fossil cosmological radiation, both we and our environment are made of ordinary, 'baryonic' matter. Authors Mazure and Le Brun present the inventory of matter, baryonic and exotic, and investigating the nature and fate of matter's twin, anti-matter. They show how technological progress has been a result of basic research, in tandem with the evolution of new ideas, and how the combined effect of these advances might help lift the cosmic veil.
Author: Minos Axenides Publisher: World Scientific ISBN: 9814474789 Category : Science Languages : en Pages : 704
Book Description
This volume is the latest in a prominent biannual series of scientific meetings on the exciting research topics of dark matter and, more recently, of dark energy. It contains a state-of-the-art update on detection efforts by experimental groups around the world trying to pin down exotic new forms of matter under the names of axions, neutralinos, wimps, primordial black holes, q balls, sterile neutrinos, as well as a tantalizing new form of dark energy component called phantom energy and quintessence. The book is self-contained as it also includes general reviews on recent cosmological observations — supernovae measurements, cosmic matter distribution surveys and cosmic radiation anisotropies — introducing even the uninitiated reader to this fascinating frontier of research.
Author: Wolfgang Kapferer Publisher: Springer Nature ISBN: 3662622025 Category : Science Languages : en Pages : 181
Book Description
Get ready to embark on the exciting search for dark matter—the invisible mass that dominates our universe. This popular science book explains why this mysterious dark matter has been incorporated into the standard model of the universe and how scientists are able to “observe” the invisible. The book starts with the early indications of the existence of dark matter, including the strange cohesion of galaxy clusters, before moving on to modern observations like cosmic background radiation. Along the way, you will learn about the direct and indirect methods being used by researchers to track down dark matter and whatever is behind this strange phenomenon. The Mystery of Dark Matter will appeal to general readers who wish to understand what scientists actually know about dark matter, along with the methods they use to help crack the mystery. This book is a translation of the original German 1st edition Das Rätsel Dunkle Materie by Wolfgang Kapferer, published by Springer-Verlag GmbH Deutschland in 2018.The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors.
Author: Vitaly Kudryavtsev Publisher: World Scientific ISBN: 9814486981 Category : Science Languages : en Pages : 684
Book Description
This book contains written versions of the presentations made at the 4th International Workshop on the Identification of Dark Matter (IDM 2002), held in York, UK, in September 2002. The objective of this workshop series is to assess the status of work attempting to identify what constitutes dark matter — in particular, to consider the techniques being used, how successful they are, and what new techniques are likely to improve prospects for identifying likely dark matter candidates in the future. At IDM 2002 special emphasis was placed on recent results obtained in searches for baryonic and non-baryonic dark matter. The proceedings include reviews of major topics on dark matter, as well as short contributed talks.
Author: Gianpaolo Patrick Carosi
Author: Gianpaolo Patrick Carosi
Author: Roberto Battiston
Author: Mehr Un Nisa
Author: Enrico Morgante
Author: 
Author: Alain Mazure
Author: Minos Axenides
Author: Wolfgang Kapferer
Author: Vitaly Kudryavtsev
Author: Elisa Falchini