New Constraints on Muon-neutrino to Electron-neutrino Transitions in MINOS. PDF Download
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Languages : en
Pages : 5
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Book Description
This letter reports results from a search for [nu]{sub {mu}}2!nu]{sub {mu}} transitions by the MINOS experiment based on a 7 x 1020 protons-on-target exposure. Our observation of 54 candidate e events in the Far Detector with a background of 49.1 ± 7.0(stat.) ± 2.7(syst.) events predicted by the measurements in the Near Detector requires 2 sin2(2[theta]13) sin2[theta]23
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
This letter reports results from a search for [nu]{sub {mu}}2!nu]{sub {mu}} transitions by the MINOS experiment based on a 7 x 1020 protons-on-target exposure. Our observation of 54 candidate e events in the Far Detector with a background of 49.1 ± 7.0(stat.) ± 2.7(syst.) events predicted by the measurements in the Near Detector requires 2 sin2(2[theta]13) sin2[theta]23
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Languages : en
Pages : 2
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Book Description
MINOS is a long-baseline neutrino oscillation experiment situated along Fermilab's high-intensity NuMI neutrino beam. MINOS has completed an updated search for muon neutrino to electron neutrino transitions, observation of which would indicate a non-zero value for the neutrino mixing angle [theta]13. The present 7 x 102° protons-on-target data set represents more than double the exposure used in the previous analysis. The new result and its implications are presented.
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Languages : en
Pages : 5
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This letter reports on a search for [nu]{sub {mu}} → [nu]{sub e} transitions by the MINOS experiment based on a 3.14 x 102° protons-on-target exposure in the Fermilab NuMI beam. We observe 35 events in the Far Detector with a background of 27 ± 5(stat.) ± 2(syst.) events predicted by the measurements in the Near Detector. If interpreted in terms of [nu]{sub {mu}} → [nu]{sub e} oscillations, this 1.5 [sigma] excess of events is consistent with sin2(2[theta]13) comparable to the CHOOZ limit when.
Author: Juan Pedro Ochoa-Ricoux
Publisher: Springer
ISBN: 9781461428602
Category : Science
Languages : en
Pages : 296
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Book Description
The centerpiece of the thesis is the search for muon neutrino to electron neutrino oscillations which would indicate a non-zero mixing angle between the first and third neutrino generations (θ13), currently the “holy grail” of neutrino physics. The optimal extraction of the electron neutrino oscillation signal is based on the novel “library event matching” (LEM) method which Ochoa developed and implemented together with colleagues at Caltech and at Cambridge, which improves MINOS’ (Main Injector Neutrino Oscillator Search) reach for establishing an oscillation signal over any other method. LEM will now be the basis for MINOS’ final results, and will likely keep MINOS at the forefront of this field until it completes its data taking in 2011. Ochoa and his colleagues also developed the successful plan to run MINOS with a beam tuned for antineutrinos, to make a sensitive test of CPT symmetry by comparing the inter-generational mass splitting for neutrinos and antineutrinos. Ochoa’s in-depth, creative approach to the solution of a variety of complex experimental problems is an outstanding example for graduate students and longtime practitioners of experimental physics alike. Some of the most exciting results in this field to emerge in the near future may find their foundations in this thesis.
Author: Leonard A Cole
Publisher: World Scientific
ISBN: 9811231079
Category : Biography & Autobiography
Languages : en
Pages : 300
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Book Description
A mixture of memoir and biography, Chasing the Ghost: Nobelist Fred Reines and the Neutrino tells a deeply human story that appeals both to scientists and non-scientists. Although the book relates to the important discovery of neutrinos, it is more intimately about Fred Reines than the technical details of neutrino physics. Narrated in a fashion to interest and excite the reader, the science presented here is accessible to a broad audience. Coursing through Reines' life, his various challenges and encounters, the book reveals constants of his persona. Reines displayed a sustained consistency as a respected leader, admired by students and colleagues as a fount of big ideas and ambition. A continuing source of inspiration and motivation to others, his most basic consistency was his passion for science. The quest for knowledge about the wondrous universe is a profoundly human endeavor. Fred Reines' life and his unremitting scientific curiosity are emblematic of that truth.'This book is a most welcome account about Frederick Reines and his great contributions to neutrino physics and astrophysics. The methods he designed in the 1950s to discover neutrinos in nuclear reactor experiments are still being used. His later work included the detection of atmospheric neutrinos which was a forerunner to the discovery of neutrino oscillations, the ability of neutrinos to change from one type to another. This finding was a significant step to other experiments that aim to answer profound questions about the nature of the universe including why it is composed of matter.'Takaaki KajitaNobel Laureate in PhysicsNeutrino Researcher, University of Tokyo 'Cole has provided a compelling personal and scientific account of a remarkable pioneer in Neutrino Physics.'Arthur B McDonaldNobel Laureate in PhysicsDirector of the Sudbury Neutrino ObservatoryProfessor, Queen's University, Ontario, Canada
Author: Tingjun Yang
Publisher:
ISBN:
Category :
Languages : en
Pages : 271
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Author:
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Category :
Languages : en
Pages :
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Data from the MINOS experiment has been used to search for mixing between muon neutrinos and muon antineutrinos using a time-independent Lorentz-violating formalism derived from the Standard-Model Extension (SME). MINOS is uniquely capable of searching for muon neutrino-antineutrino mixing given its long baseline and ability to distinguish between neutrinos and antineutrinos on an event-by-event basis. Neutrino and antineutrino interactions were observed in the MINOS Near and Far Detectors from an exposure of 10.56$\times10^{20}$ protons-on-target from the NuMI neutrino-optimized beam. No evidence was found for such transitions and new, highly stringent limits were placed on the SME coefficients governing them. We place the first limits on the SME parameters $(c_{L})^{TT}_{\mu\mu} $ and $(c_{L})^{TT}_{\tau\tau}$ at $-8.4\times10^{-23}
Author: Ashley Michael Timmons
Publisher: Springer
ISBN: 331963769X
Category : Science
Languages : en
Pages : 177
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Book Description
This thesis highlights data from MINOS, a long-baseline accelerator neutrino experiment, and details one of the most sensitive searches for the sterile neutrino ever made. Further, it presents a new analysis paradigm to enable this measurement and a comprehensive study of the myriad systematic uncertainties involved in a search for a few-percent effect, while also rigorously investigating the statistical interpretation of the findings in the context of a sterile neutrino model. Among the scientific community, this analysis was quickly recognized as a foundational measurement in light of which all previous evidence for the sterile neutrino must now be (re)interpreted. The existence of sterile neutrinos has long been one of the key questions in the field. Not only are they a central component in many theories of new physics, but a number of past experiments have yielded results consistent with their existence. Nonetheless, they remain controversial: the interpretation of the data showing evidence for these sterile neutrinos is hotly debated.
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Category :
Languages : en
Pages : 238
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Book Description
One of the primary goals in neutrino physics at the present moment is to make a measurement of the neutrino oscillation parameter $\theta_$. This parameter, in addition to being unknown, could potentially allow for the introduction of CP violation into the lepton sector. The MINOS long-baseline neutrino oscillation experiment has the ability to make a measurement of this parameter, by looking for the oscillation of muon neutrinos to electron neutrinos between a Near and Far Detector over a distance of 735 km. This thesis discusses the development of an analysis framework to search for this oscillation mode. Two major improvements to pre-existing analysis techniques have been implemented by the author. First, a novel particle ID technique based on strip topology, known as the Library Event Matching (LEM) method, is optimized for use in MINOS. Second, a multiple bin likelihood method is developed to fit the data. These two improvements, when combined, increase MINOS' sensitivity to $\sin^2(2\theta_)$ by 27\% over previous analyses. This thesis sees a small excess over background in the Far Detector. A Frequentist interpretation of the data rules out $\theta_=0$ at 91\%. A Bayesian interpretation of the data is also presented, placing the most stringent upper boundary on the oscillation parameter to date, at $\sin^2(2\theta_)
Author:
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Category :
Languages : en
Pages : 5
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Book Description
The authors report the results of a search for?{sub e} appearance in?{sub {mu}} beam in the MINOS long-baseline neutrino experiment. With an improved analysis and an increased exposure of 8.2 x 102° protons on the NuMI target at Fermilab, they find that 2 sin2 (?23) sin2 (?13)
