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Testing Nonstandard Neutrino Interaction Parameters With Icecube Deepcore
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Book Synopsis Testing Nonstandard Neutrino Interaction Parameters with IceCube-DeepCore by : Elisa Lohfink
Download or read book Testing Nonstandard Neutrino Interaction Parameters with IceCube-DeepCore written by Elisa Lohfink and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, the clearest evidence for physics beyond the Standard Model is provided by observations that indicate non-zero neutrino masses. Numerous theories on how these masses are generated give rise to additional non-standard interactions (NSI) of neutrinos with quarks and charged leptons. Atmospheric neutrinos provide a sensitive probe for the neutrino flavor transitions resulting from the type of NSI investigated in this work. These comprise neutral current forward scattering of neutrinos of all flavors on first generation charged fermions in Earth matter. In order to maximize model independence, the NSI are parametrized using five effective coupling strengths. In the IceCube-DeepCore detector, atmospheric neutrinos are detected indirectly via Cherenkov photons produced within the Antarctic glacier. The range of angles under which neutrinos enter the detector translates into propagation baselines of O(1 - 10000 )km. The data sample used in the presented analysis includes 9.3 years of DeepCore data, covering a neutrino energy range of 5 to 100 GeV. Accuracy and performance of event property reconstruction from observed photons are a crucial factor for the analysis outcome. Therefore, this work includes a thorough study of the potential and shortcomings of likelihood based DeepCore event reconstruction algorithms. The presented analysis relies on comparing binned observed event counts to simulation that is generated at different hypotheses. These include the individually considered NSI parameters as well as 17 nuisance parameters. In order to find the hypothesis that best describes the observation, the optimum of a test statistic is determined using a customized minimization strategy. The final analysis setup yields sensitivities to four effective NSI couplings that are competitive compared with existing results.
Book Synopsis Measuring the Atmospheric Neutrino Oscillation Parameters with Icecube Deepcore by : Kayla Leonard DeHolton
Download or read book Measuring the Atmospheric Neutrino Oscillation Parameters with Icecube Deepcore written by Kayla Leonard DeHolton and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For decades, the Standard Model of Particle Physics has stood the test of time, being one of the most comprehensive and reliable models ever proposed. One of the few exceptions to its robustness was the discovery of neutrino oscillations (and consequently the implication that neutrinos have mass). It is one of the only confirmed pieces of evidence of physics beyond the Standard Model. Since this discovery, there has been a worldwide effort on both the theoretical and experimental fronts to answer many questions that this discovery raised. Many neutrino experiments around the world seek to measure the model parameters that describe these oscillations within the current theoretical 3 neutrino framework. The IceCube Neutrino Observatory is a kilometer-scale detector embedded in the Antarctic ice at the South Pole and detects Cherenkov light produced by neutrinos interacting in the ice. DeepCore is a densely instrumented sub-array within the full detector that observes interactions of atmospheric neutrinos down to 5 GeV. At these energies, Earth-crossing muon neutrinos have a high chance of oscillating to tau neutrinos. DeepCore is able to measure these oscillations with precision comparable to accelerator-based experiments, but it is also complementary to accelerator measurements because it probes longer distance scales and higher energies, peaking above the tau lepton production threshold. This dissertation presents the effort involved in curating one of the largest neutrino oscillation datasets in the world, with over 200,000 events spanning almost 10 years (from April 2012 to January 2022) and a neutrino purity of over 99%. This sample is optimized for performing a measurement of the atmospheric neutrino oscillation parameters. The nearly unprecedented level of statistics also requires unprecedented precision in the treatment of systematic uncertainties. Compared to previous DeepCore analyses, this analysis benefits from improved background rejection, new simulation, a new reconstruction, a new machine learning particle classification algorithm, improved modeling of systematic uncertainties, and more years of data. Given the large number of changes compared to previous analyses, an extensive suite of quality and robustness checks were performed. Even with the extensive testing program, our fit to data informed us that our modeling is not yet on par with the level of statistical precision achieved with the new sample; the goodness-of-fit between our data and simulation yielded a p-value of 0[percent]. At the time of writing, there remains an ongoing effort to improve our models to describe the full dataset. This dissertation includes the unblinded results of an analysis performed with a sub-sample containing 20[percent] of the full dataset.
Book Synopsis Non-standard Neutrino Interactions in the Mu{u2013}tau Sector by :
Download or read book Non-standard Neutrino Interactions in the Mu{u2013}tau Sector written by and published by . This book was released on 2015 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss neutrino mass hierarchy implications arising from the effects of non-standard neutrino interactions on muon rates in high statistics atmospheric neutrino oscillation experiments like IceCube DeepCore. We concentrate on the mu–tau sector, which is presently the least constrained. It is shown that the magnitude of the effects depends strongly on the sign of the ϵ?? parameter describing this non-standard interaction. A simple analytic model is used to understand the parameter space where differences between the two signs are maximized. We discuss how this effect is partially degenerate with changing the neutrino mass hierarchy, as well as how this degeneracy could be lifted.
Book Synopsis A Study of Atmospheric Neutrino Oscillation Using the IceCube DeepCore Detector by :
Download or read book A Study of Atmospheric Neutrino Oscillation Using the IceCube DeepCore Detector written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IceCube detector at the South Pole is a cubic-kilometer-scale neutrino detector designed to observe TeV-range charged particle secondaries from neutrino interactions, and thus do neutrino astronomy. As a main background to the search for astrophysical point sources of neutrinos, IceCube also observes muons and neutrinos from the atmospheric interactions of cosmic rays. By observing a spectrum of atmospheric neutrinos and comparing it to independent predictions of atmospheric fluxes with and without oscillations, IceCube can test various values of oscillation parameters. Neutrino oscillations have been observed experimentally for several decades; IceCube is the first experiment to extend this measurement to the 10-20 GeV energy range. An initial analysis has established that IceCube can see oscillations using the 79-string detector configuration ("IC79"), which was the first year of data that included the DeepCore detector. As a follow-up, this analysis uses a less restrictive event selection and thus a higher total event count, around 3,000 for one year of data. The fit is a Poisson likelihood fit of a two-dimensional rate histogram, using both oscillated length and observed energy. The arrival zenith angle of the muon is used as a proxy for oscillation length. The error contours are dominated by systematic effects more than by statistical limitations of the data. Major systematics include uncertainties in the atmospheric neutrino flux at high energies and uncertainties in the distribution of the cosmic ray muon background. This analysis was designed to produce limits on the mixing angle &theta23 that are competitive with other current experiments, although this is still uncertain as error analysis work is ongoing. Future work will further refine the event selection and systematic error analysis; the statistical methods and software used here are expected to become the IceCube oscillations standard. This thesis also includes background information about the history of neutrino physics, basics of oscillation formalism, and the IceCube DeepCore detector. A brief chapter is included on the search for a deficit in cosmic ray muons from the direction of the Moon, and the implications of that deficit for the pointing resolution of IceCube.
Book Synopsis Testing the Neutrino Mass Ordering with IceCube DeepCore by : Martin Leuermann
Download or read book Testing the Neutrino Mass Ordering with IceCube DeepCore written by Martin Leuermann and published by . This book was released on 2018* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Physics Associated with Neutrino Masses by : Diego Aristizabal Sierra
Download or read book The Physics Associated with Neutrino Masses written by Diego Aristizabal Sierra and published by Frontiers Media SA. This book was released on 2020-01-13 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis State Of The Art Of Neutrino Physics, The: A Tutorial For Graduate Students And Young Researchers by : Antonio Ereditato
Download or read book State Of The Art Of Neutrino Physics, The: A Tutorial For Graduate Students And Young Researchers written by Antonio Ereditato and published by World Scientific. This book was released on 2018-03-23 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutrino is the most fascinating elementary particle due to its elusive nature and outstanding properties that have attracted the interest of generations of physicists since 1930, when it was first postulated by Wolfgang Pauli as a 'desperate remedy' to explain the apparent energy violation in the beta decay. Many fundamental discoveries in particle physics had the neutrino involved in one way or another. To date, neutrino physics is still one of the hottest topics of modern particle physics. Key experiments and significant theoretical developments have contributed in building up what we can call now the Standard Model of Neutrino Physics.The aim of the book is to provide graduate students and young researchers a comprehensive tutorial in modern neutrino physics, specially tailored with emphasis on the educational aspects. It provides an overview of the basics and of recent achievements in the field, from both experimental and theoretical points of view.
Book Synopsis Neutrino Cosmology by : Julien Lesgourgues
Download or read book Neutrino Cosmology written by Julien Lesgourgues and published by Cambridge University Press. This book was released on 2013-02-21 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: A self-contained guide to the role played by neutrinos in the Universe and how their properties influence cosmological and astrophysical observations.
Book Synopsis Measurement of Atmospheric Muon Neutrino Disappearance with IceCube-DeepCore by : Matthew Dunkman
Download or read book Measurement of Atmospheric Muon Neutrino Disappearance with IceCube-DeepCore written by Matthew Dunkman and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of muon neutrino disappearance presentedhere was designed to make use of neutrinos of all flavors,exploiting $\nu_e$ events and more poorly reconstructedcascade-like neutrino events to better constrain systematicuncertainties associated with neutrino fluxes and interactions. Inaccordance with IceCube Collaboration policy, the analysis was developed "blind,'' with reference to Monte Carlo simulations and down-going events where no oscillation signal could be visible. Discrepancies observed in the data when they were examined after theanalysis was finalized led to the conclusion that the cascade-like and intermediate data samples were affected by unexpected systematiceffects, so that their inclusion in the analysis produced substantialbias. This analysis thus relied exclusively on the track-like data sample, while investigations into the nature of these systematic effects continue in preparation for an IceCubejournal article.The best fit and 68% confidence interval from this analysison the two oscillation parameters which drive muon neutrino disappearance are\begin{align*} \sin^2 \theta_{23} &= 0.53_{-0.11}^{+0.07}, \\ \Delta m_{32}^2 / 10^{-3}\mathrm{eV}^2 &= 2.35_{-0.17}^{+0.14},\end{align*}which are compatible and competitive with measurements madeby dedicated beam-line neutrino experiments.
Book Synopsis Latest Results on Atmospheric Neutrino Oscillations from IceCube/DeepCore by :
Download or read book Latest Results on Atmospheric Neutrino Oscillations from IceCube/DeepCore written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for EV-scale Sterile Neutrinos with IceCube DeepCore by : Alexander Trettin
Download or read book Search for EV-scale Sterile Neutrinos with IceCube DeepCore written by Alexander Trettin and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Englische Version: Neutrino oscillations are the only phenomenon beyond the Standard Model that has been confirmed experimentally to a very high statistical significance. This work presents a measurement of atmospheric neutrino oscillations using eight years of data taken by the IceCube DeepCore detector between 2011 and 2019. The event selection has been improved over that used in previous DeepCore measurements with a particular emphasis on its robustness with respect to systematic uncertainties in the detector properties. The oscillation parameters are estimated via a maximum likelihood fit to binned data in the observed energy and zenith angle, where the expectation is derived from weighted simulated events. This work discusses the simulation and data selection process, as well as the statistical methods employed to give an accurate expectation value under variable detector properties and other systematic uncertainties. The measurement is first performed first under the standard three-flavor oscillation model, where the atmospheric mass splitting and mixing angle are estimated to be $\Delta m 2_{32} = 2.42_{-0.75} {+0.77} \times10 {-3}\;\mathrm{eV} 2$ and $\sin 2\theta_{23} = 0.507_{-0.053} {+0.050}$, respectively. The three-flavor model is then extended by an additional mass eigenstate corresponding to a sterile neutrino with mass splitting $\Delta m 2_{41} = 1\;\mathrm{eV} 2$ that can mix with the active $\nu_\mu$ and $\nu_\tau$ flavor states. No significant signal of a sterile neutrino is observed and the mixing amplitudes between the sterile and active states are constrained to $!U_{\mu 4}! 2
Book Synopsis Measurement of Atmospheric Neutrino Oscillations with IceCube/DeepCore in Its 79-string Configuration by : Sebastian Euler
Download or read book Measurement of Atmospheric Neutrino Oscillations with IceCube/DeepCore in Its 79-string Configuration written by Sebastian Euler and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-standard Neutrino Interactions at DUNE. by :
Download or read book Non-standard Neutrino Interactions at DUNE. written by and published by . This book was released on 2016 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, we explore the effects of non-standard neutrino interactions (NSI) and how they modify neutrino propagation in the Deep Underground Neutrino Experiment (DUNE). We find that NSI can significantly modify the data to be collected by the DUNE experiment as long as the new physics parameters are large enough. For example, if the DUNE data are consistent with the standard three-massive-neutrinos paradigm, order 0.1 (in units of the Fermi constant) NSI effects will be ruled out. On the other hand, if large NSI effects are present, DUNE will be able to not only rule out the standard paradigm but also measure the new physics parameters, sometimes with good precision. We find that, in some cases, DUNE is sensitive to new sources of CP-invariance violation. We also explored whether DUNE data can be used to distinguish different types of new physics beyond nonzero neutrino masses. In more detail, we asked whether NSI can be mimicked, as far as the DUNE setup is concerned, by the hypothesis that there is a new light neutrino state.
Book Synopsis Neutrino Mass Ordering Studies with IceCube-DeepCore by : Steven Wren
Download or read book Neutrino Mass Ordering Studies with IceCube-DeepCore written by Steven Wren and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Neutrino Oscillations in Atmospheric Neutrinos with the IceCube DeepCore Detector by :
Download or read book Measurement of Neutrino Oscillations in Atmospheric Neutrinos with the IceCube DeepCore Detector written by and published by . This book was released on 2014 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Neutrino Oscillations with IceCube-DeepCore by : Markus Vehring
Download or read book Measurement of Neutrino Oscillations with IceCube-DeepCore written by Markus Vehring and published by . This book was released on 2017* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-standard Neutrino Interactions in the Mu-tau Sector by :
Download or read book Non-standard Neutrino Interactions in the Mu-tau Sector written by and published by . This book was released on 2015 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
