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| Author | : Dave Shaw |
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| Release | : 2018 |
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| Author | : Linda Cremonesi |
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| Release | : 2015 |
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| Author | : Matthew Lawe |
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| Release | : 2015 |
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| Release | : 1988 |
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| Author | : Samantha Short |
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| Release | : 2013 |
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| Total Pages | : 7 |
| Release | : 2015 |
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We studied single neutral pion production via muon antineutrino charged-current interactions in plastic scintillator (CH) using the MINERvA detector exposed to the NuMI low-energy, wideband antineutrino beam at Fermilab. Measurement of this process constrains models of neutral pion production in nuclei, which is important because the neutral-current analog is a background for appearance oscillation experiments. Furthermore, the differential cross sections for [pi]0 momentum and production angle, for events with a single observed [pi]0 and no charged pions, are presented and compared to model predictions. These results comprise the first measurement of the [pi]0 kinematics for this process.
| Author | : Kevin Thomas Connolly |
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| Total Pages | : 145 |
| Release | : 2014 |
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In this thesis the development and study of a method for a model-dependent measurement of the muon neutrino charged current (CC) single pion interaction's positive pion momentum spectrum is proposed. The measurement is part of the Tokai-to-Kamioka (T2K) experiment and was performed in Tokai at the near detector hall, using an event selection from a fine-grained detector (FGD) on a carbon target. The T2K neutrino beam has a peak energy of about 0.6 GeV, and the near detector is located 280 m downstream from the proton beam target. Data from 5.9 x10^20 protons on target was collected and used in a CC-inclusive and CC-exclusive event selection. The inclusive event selection contains about 25,000 CC muon neutrino events, and was subdivided into a single positively charged pion production channel (CC-1-pion) and a CC multi-pion interaction channel (CC-other). The official event selection, applied to both data and Monte Carlo (MC), is presented. Amongst the systematic errors involved in this event selection, the development of a novel detector systematic, created by the author of this thesis and dubbed the "hybrid analysis" is presented in detail. The analysis of published CC muon interaction data from deuterium bubble chamber experiments is presented in detail and used to tune a model of charged pion multiplicities. Utilizing this model, a systematic error on the number of charged pions produced in CC multi-pion events is characterized for the first time and implemented. The official T2K MC corresponding to the presented event selection is used extensively in the development, study and validation of a fitting method proposed to extract the a model- dependent measurement of the CC-1-pion differential cross section with respect to true positive pion momentum. The studies to date suggest tuning of input cross section model parameters may need to be re-evaluated to ensure representative validation tests, and that the fit method may need to include a regularization method.
| Author | : Raquel Castillo Fernández |
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| Total Pages | : 225 |
| Release | : 2015 |
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| ISBN | : 9788449055034 |
El experimento T2K es un experimento de neutrinos de largo recorrido que utiliza un haz casi puro the neutrinos muónicos. El objetivo principal del experimento es a medida de los parámetros de oscilación del neutrino muónicos. Para conseguir éste objetivo, T2K necesita una rigurosa predicción del índice de interacciones en el detector lejano, Super-KamiokaNDE. El detector cercano de T2K, ND280, calcula el índice de interacciones y estima el número de eventos en el detector lejano. Las interacciones de neutrino muónico de corriente cargada en el detector cercano (ND280) son usadas para predecir el índice de eventos en el detector lejano (Super-KamiokaNDE). Para una mejor restricción de los parámetros de sección eficaz, los cuales dominan el análisis junto con las incertezas de la prediccion del flujo, categorizamos los eventos seleccionados en tres grupos de acuerdo con el número de piones en el estado final. Estas tres categorías permiten un mejor ajuste de la señal del canal de oscilación (Corriente Cargada Quasielástica) y el principal ruído en oscilaciones (Corriente Cargada de 1 Pión Cargado). Actuales y futuros experimentos de neutrinos están limitados por las incertezas en las secciones eficaces de neutrinos. Los modelos actuales de sección eficaz están en tension con los datos experimentales en algunos rangos energéticos. Esto hace que sea critico estudiar secciones eficaces de neutrino--nucleo en todos los canales de interacción posibles. La producción the un solo pión en interacciones de neutrino muónico de corriente cargada es uno de los principales canales en tensión con los modelos. Como segunda contribución, presentamos el cálculo de producción the un solo pión en interacciones de neutrino muónico de corriente cargada usando un enfoque indepenediente del modelo explorando la capacidad total del detector ND280 para establecer las distribuciones cinemáticas del evento. La mejore del conocimiento de las interacciones, y en concreto del canal de producción de un sólo pión, permitirá la reducción de las incertidumbres sistemáticas en el análisis de oscilaciones.
| Author | : Aaron Bercellie |
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| Total Pages | : 795 |
| Release | : 2022 |
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"Measurements of neutrino oscillation parameters at accelerator-based experiments require precise knowledge of neutrino interaction cross sections. A significant fraction of neutrino interactions observed in these experiments produce single charged pions. While single charged pion production has been measured on hydrocarbon and water, few precise measurements exist for heavier targets, and there are no high statistics measurements that directly compare pion production on different targets. This thesis measures differential cross sections of muon neutrino charged current single charged pion production with no other mesons in the final state in a neutrino beam with a mean energy of ~ 6 GeV. The pion production is studied on targets of scintillator, carbon, water, iron, and lead at MINERvA, a neutrino cross section experiment located in the NuMI beamline at Fermilab. These measured cross sections are differential in [mu]- and [pi]+ kinematics. A strong suppression of low Q2 and an enhancement of low T[Pi] are observed relative to commonly used neutrino interaction models in both the light and heavy nuclear targets. Incorporation of these observed effects in future neutrino oscillation experiments will improve their ability to measure energy of neutrino interactions, and therefore measure the parameters governing neutrino oscillations."--Page xii
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| Total Pages | : 148 |
| Release | : 2009 |
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Understanding single charged pion production via neutrino-nucleus charged current interaction in the neutrino energy region of a few GeV is essential for future neutrino oscillation experiments since this process is a dominant background for v[mu] → vx oscillation measurements. There are two contributions to this process: single pion production via baryonic resonance (v[mu]N → [mu]- N[pi]+) and coherent pion production interacting with the entire nucleus (v[mu]A → [mu]- A[pi]+), where N is nucleon in the nucleus and A is the nucleus. The purpose of the study presented in this thesis is a precise measurement of charged current single charged pion productions, resonant and coherent pion productions, with a good final state separation in the neutrino energy region of a few GeV. In this thesis, we focus on the study of charged current coherent pion production from muon neutrinos scattering on carbon, v[mu] 12C → [mu]-12C[pi]+, in the SciBooNE experiment. This is motivated by the fact that without measuring this component first, the precise determination of resonant pion production cross section can not be achieved since the contribution of coherent pion production in the region of small muon scattering angle is not small. Furthermore, the coherent process is particularly interesting because it is deeply rooted in fundamental physics via Adler's partially conserved axial-vector current theorem. We took data from June 2007 until August 2008, in both the neutrino and antineutrino beam. In total, 2.52 x 1020 protons on target were collected. We have performed a search for charged current coherent pion production by using SciBooNE's full neutrino data set, corresponding to 0.99 x 1020 protons on target. No evidence for coherent pion production is observed. We set 90% confidence level upper limits on the cross section ratio of charged current coherent pion production to the total charged current cross section at 0.67 x 10-2 at mean neutrino energy 1.1 GeV and 1.36 x 10-2 at mean neutrino energy 2.2 GeV. We reveal that the Rein-Sehgal model widely used in neutrino oscillation experiments breaks down at the neutrino energy region of a few GeV. This creates active controversies on the model of coherent pion production, and the understanding of coherent pion production is being progressed. In addition, future prospects of measurements of charged current single charged pion production in SciBooNE are discussed.
