46,239 research outputs found
Strong Constraints on Neutrino Nonstandard Interactions from TeV-Scale nu mu Disappearance at IceCube
No full textPublished 29 June 2022We report a search for nonstandard neutrino interactions (NSI) using eight years of TeV-scale atmospheric muon neutrino data from the IceCube Neutrino Observatory. By reconstructing incident energies and zenith angles for atmospheric neutrino events, this analysis presents unified confidence intervals for the NSI parameter ϵμτ. The best-fit value is consistent with no NSI at a p value of 25.2%. With a 90% confidence interval of -0.0041 ≤ ϵμτ ≤ 0.0031 along the real axis and similar strength in the complex plane, this result is the strongest constraint on any NSI parameter from any oscillation channel to date.R. Abbasi ... R. T. Burley ... E. G. Carnie-Bronca ... G. H. Collin ... G. C. Hill ... E. J. Roberts ... et al.(IceCube Collaboration
Search for Unstable Sterile Neutrinos with the IceCube Neutrino Observatory
No full textPublished 7 October 2022We present a search for an unstable sterile neutrino by looking for a resonant signal in eight years of atmospheric ν_{μ} data collected from 2011 to 2019 at the IceCube Neutrino Observatory. Both the (stable) three-neutrino and the 3+1 sterile neutrino models are disfavored relative to the unstable sterile neutrino model, though with p values of 2.8% and 0.81%, respectively, we do not observe evidence for 3+1 neutrinos with neutrino decay. The best-fit parameters for the sterile neutrino with decay model from this study are Δm_{41}^{2}=6.7_{-2.5}^{+3.9} eV^{2}, sin^{2}2θ_{24}=0.33_{-0.17}^{+0.20}, and g^{2}=2.5π±1.5π, where g is the decay-mediating coupling. The preferred regions of the 3+1+decay model from short-baseline oscillation searches are excluded at 90% C.L.R. Abbasi ... R. T. Burley ... E. G. Carnie-Bronca ... G. C. Hill ... E. J. Roberts ... et al. (IceCube Collaboration
Search for Correlations of High-energy Neutrinos Detected in IceCube with Radio-bright AGN and Gamma-Ray Emission from Blazars
No full textPublished 2023 August 23The IceCube Neutrino Observatory sends realtime neutrino alerts with a high probability of being astrophysical in origin. We present a new method to correlate these events and possible candidate sources using 2089 blazars from the Fermi-LAT 4LAC-DR2 catalog and with 3413 active galactic nuclei (AGNs) from the Radio Fundamental Catalog. No statistically significant neutrino emission was found in any of the catalog searches. The result suggests that a small fraction, <1%, of the studied AGNs emit neutrinos that pass the alert criteria, and is compatible with prior evidence for neutrino emission presented by IceCube and other authors from sources such as TXS 0506 + 056 and PKS 1502 + 106. We also present cross-checks to other analyses that claim a significant correlation using similar data samples.R. Abbasi ... R. T. Burley ... E. G. Carnie-Bronca ... G. H. Collin ... G. C. Hill ... E. J. Roberts ... et al. (IceCube Collaboration
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Search for Relativistic Magnetic Monopoles with Eight Years of IceCube Data
No full textWe present an all-sky 90% confidence level upper limit on the cosmic flux of relativistic magnetic monopoles using 2886 days of IceCube data. The analysis was optimized for monopole speeds between 0.750c and 0.995c, without any explicit restriction on the monopole mass. We constrain the flux of relativistic cosmic magnetic monopoles to a level below 2.0 × 10¯¹⁹ cm¯² s¯¹ sr¯¹ over the majority of the targeted speed range. This result constitutes the most strict upper limit to date for magnetic monopoles with β ≳ 0.8 and up to β ∼ 0.995 and fills the gap between existing limits on the cosmic flux of nonrelativistic and ultrarelativistic magnetic monopoles.R. Abbasi ... R. T. Burley ... E. G. Carnie-Bronca ... G. C. Hill ... E. J. Roberts ... et al. (IceCube Collaboration
Author, publisher and bookseller : a tripartite synergy in Nigerian book industry
No full textThis work is about the roles of Author, Publisher and Bookseller in Book development in
Nigeria. The paper started by delving into the history of Book Publishing in Nigeria after
which it proceeded by defining who an author, a publisher, and a bookseller is and
expatiated on the indispensable roles of these key actors in Nigerian Book Industry and in
the emerging Information Society. Furthermore, the various constraints to book
development were identified while the paper advised on how the Book Industry can be
further promoted in Nigeria. However, the paper concluded and made recommendations
on how the Book sector can help in enhancing scholarship in the country
Mining e-mail content for author identification forensics
No full textWe describe an investigation into e-mail content mining for author identification, or authorship attribution, for the purpose of forensic investigation. We focus our discussion on the ability to discriminate between authors for the case of both aggregated e-mail topics as well as across different email topics. An extended set of e-mail document features including structural characteristics and linguistic patterns were derived and, together with a Support Vector Machine learning algorithm, were used for mining the e-mail content. Experiments using a number of e-mail documents generated by different authors on a set of topics gave promising results for both aggregated and multi-topic author categorisation
Un nuevo manuscrito de Chimalpahin.. Anales del Instituto Nacional de Antropología e Historia. Num. 50 Tomo II (1969) Séptima Época (1967-1976)
No full textChimalpahin, Cuauhtlehuanitzin Francisco de San Antón Muñón 1965 Relaciones originales de Chalco Amaquemecan. Paleografía, traducción y glosa de Silvia Rendón. Fondo de Cultura Económica. México.Mengin, E. (Ed.) 1949 Diferentes historias originales de los Reynos de Culhuacan, y México, y de otras provincias. El autor de ellas dicho Don Domingo Chimalpahín. Manuscrito mexicano No. 74. Corpus Codicum Americanorum. Medii Aevi, vol. III. Copenhagen.Pompa y Pompa, A. 1964 La Biblioteca Nacional de Antropología e Historia. Boletín del Instituto Nacional de Antropología e Historia, No. 17, pp. 34-36. México.Simeón, R. 1899 Annales de Domingo Francisco de San Antón Muñón Chimalpahin Quauhtlehuanitzin. Sixième et septième Relations ( 1258-1612). Bibliothèque Linguistique Americaine, No. XII. Paris.Zimmerman, G. 1965 Die Relations Chimalpahin's zur Geschichte Mexico's. Das Jahrhundert nach der Conquista (1522-1615), Teil 2. Hamburg.Zimmerman, G. 1966 Chimalpahin y la iglesia de San Antón Abad en México. Traducciones Mesoamericanas, t. I. Sociedad Mexicana de Antropología. México
Non-standard neutrino interactions in IceCube
No full textPublished on: May 12, 2022.
Session: T04: Neutrino PhysicsNon-standard neutrino interactions (NSI) may arise in various types of new physics. Their existence would change the potential that atmospheric neutrinos encounter when traversing Earth matter and hence alter their oscillation behavior. This imprint on coherent neutrino forward scattering can be probed using high-statistics neutrino experiments such as IceCube and its low-energy extension, DeepCore. Both provide extensive data samples that include all neutrino flavors, with oscillation baselines between tens of kilometers and the diameter of the Earth. DeepCore event energies reach from a few GeV up to the order of 100 GeV - which marks the lower threshold for higher energy IceCube atmospheric samples, ranging up to 10 TeV. In DeepCore data, the large sample size and energy range allow us to consider not only flavor-violating and flavor-nonuniversal NSI in the μ−τ sector, but also those involving electron flavor. The effective parameterization used in our analyses is independent of the underlying model and the new physics mass scale. In this way, competitive limits on several NSI parameters have been set in the past. The 8 years of data available now result in significantly improved sensitivities. This improvement stems not only from the increase in statistics but also from substantial improvement in the treatment of systematic uncertainties, background rejection and event reconstruction.R. Abbasi ... R. T. Burley ... E. G. Carnie-Bronca ... G. H. Collin ... G. C. Hill ... E. J. Roberts ... et al. IceCube Collaboration
Analytical study of contents of LANL physics and cross-listed e-print archives, 1994-2002
No full textThe frontiers of physics and cross-listed e-print archives posted during the years 1994-2002 at http://www.arxiv.org/archives/physics web service of Los Alamos National Laboratory (LANL) are explored from 7770 submissions. E-print archives posted to top most six physics-cross-listed research categories besides physics (5390) are: Condensed matter (754), Quantum physics (279), Astrophysics (222), Chemical physics (129), High energy physics - Phenomenology (118), and High energy physics-Theory (100). Prominent contributors are B.G. Sidharth (India), V.V. Flambaum (Australia), Antonina N. Fedorova (Russia), and Michael G. Zeitlin (Russia). Most preferred journals for rechannelising e-print archives are Physical Review Letters, Physical Review A, Physical Review E, Nuclear Instruments and Methods A, and Journal of Chemical Physics
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