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| Author | : Denis Perevalov |
| Publisher | : |
| Total Pages | : 268 |
| Release | : 2010 |
| Genre | : Electronic dissertations |
| ISBN | : |
Download Neutrino-nucleus Neutral Current Elastic Interactions Measurement in MiniBooNE Book in PDF, ePub and Kindle
The MiniBooNE experiment at the Fermi National Accelerator Laboratory (Fermilab) was designed to search for electron to muon neutrino oscillations at Delta m^2~1 eV^2 using an intense neutrino flux with an average energy of about 700 MeV. From 2002 to 2009 MiniBooNE has accumulated more than 1.0x10^{21} protons on target (POT) in both neutrino and antineutrino modes. MiniBooNE provides a perfect platform for detailed measurements of exclusive and semiinclusive neutrino cross-sections, for which MiniBooNE has the largest samples of events up to date, such as neutral current elastic (NCE), neutral current pi^0, charged current quasi-elastic (CCQE), charged current pi^+, and other channels. These measured cross-sections, in turn, allow to improve the knowledge of nucleon structure. This thesis is devoted to the study of NCE interactions. Neutrino-nucleus neutral current elastic scattering accounts for about 18% of all neutrino interactions in MiniBooNE. Using a high-statistics, high purity sample of NCE interactions in MiniBooNE, the flux-averaged NCE differential cross-section has been measured and is being reported here. Further study of the NCE cross-section allowed for probing the structure of nuclei. The main interest in the NCE cross-section is that it may be sensitive to the strange quark contribution to the nucleon spin, $Delta s$, this however requires a separation of NCE proton from NCE neutron events, which in general is a challenging task. MiniBooNE uses a Cherenkov detector, which imposes restrictions on the measured nucleon kinematic variables, mainly due to the impossibility to reconstruct the nucleon direction below the Cherenkov threshold. However, at kinetic energies above this threshold MiniBooNE is able to identify NCE proton events that do not experience final state interactions. These events were used for the $Delta s$ measurement. In this thesis MiniBooNE reports the NCE (n+p) cross-section, the measurement of the axial mass, $M_A$, and the $Delta s$ parameter from the NCE data.
| Author | : |
| Publisher | : |
| Total Pages | : 268 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
Download Neutrino-nucleus Neutral Current Elastic Interactions Measurement in MiniBooNE. Book in PDF, ePub and Kindle
The MiniBooNE experiment at the Fermi National Accelerator Laboratory (Fermilab) was designed to search for [nu]{sub {mu}} 2![nu]{sub e} neutrino oscillations at [Delta]m2 H"1 eV2 using an intense neutrino flux with an average energy E{sub [nu]} H"700 MeV. From 2002 to 2009 MiniBooNE has accumulated more than 1.0 x 1021 protons on target (POT) in both neutrino and antineutrino modes. MiniBooNE provides a perfect platform for detailed measurements of exclusive and semiinclusive neutrino cross-sections, for which MiniBooNE has the largest samples of events up to date, such as neutral current elastic (NCE), neutral current [pi]°, charged current quasi-elastic (CCQE), charged current [pi], and other channels. These measured cross-sections, in turn, allow to improve the knowledge of nucleon structure. This thesis is devoted to the study of NCE interactions. Neutrino-nucleus neutral current elastic scattering ([nu]N 2![nu]N) accounts for about 18% of all neutrino interactions in MiniBooNE. Using a high-statistics, high purity sample of NCE interactions in MiniBooNE, the flux-averaged NCE differential cross-section has been measured and is being reported here. Further study of the NCE cross-section allowed for probing the structure of nuclei. The main interest in the NCE cross-section is that it may be sensitive to the strange quark contribution to the nucleon spin, [Delta]s, this however requires a separation of NCE proton ([nu]p 2![nu]p) from NCE neutron ([nu]n 2!{nu}n) events, which in general is a challenging task. MiniBooNE uses a Cherenkov detector, which imposes restrictions on the measured nucleon kinematic variables, mainly due to the impossibility to reconstruct the nucleon direction below the Cherenkov threshold. However, at kinetic energies above this threshold MiniBooNE is able to identify NCE proton events that do not experience final state interactions (FSI). These events were used for the [Delta]s measurement. In this thesis MiniBooNE reports the NCE (n+p) cross-section, the measurement of the axial mass, M{sub A}, and the [Delta]s parameter from the NCE data.
| Author | : |
| Publisher | : |
| Total Pages | : 158 |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
Download Antineutrino Neutral Current Interactions in MiniBooNE. Book in PDF, ePub and Kindle
This dissertation reports the antineutrino-nucleus neutral current elastic scattering cross section on CH2 measured by the MiniBooNE experiment located in Batavia, IL. The data set consists of 60,605 events passing the selection cuts corresponding to 10.1×1020 POT, which represents the world's largest sample of antineutrino neutral current elastic scattering events. The final sample is more than one order of magnitude lager that the previous antineutrino NCE scattering cross section measurement reported by the BNL E734 experiment. The measurement presented in this dissertation also spans a wider range in Q2, including the low-Q2 regime where the cross section rollover is clearly visible. A X2-based minimization was performed to determine the best value of the axial mass, MA and the Pauli blocking scaling function, that matches the antineutrino NCE scattering data. However, the best fit values of MA=1.29 GeV and K=1.026 still give a relatively poor X2, which suggests that the underlying nuclear model (based largely on the relativistic Fermi gas model) may not be an accurate representation for this particular interaction. Additionally, we present a measurement of the antineutrino/neutrino-nucleus NCE scattering cross section ratio. The neutrino mode NCE sample used in this study, corresponding to 6.4 × 1020 POT, is also the world's largest sample (also by an order of magnitude). We have demonstrated that the ratio measurement is robust, as most of the correlated errors cancel, as expected. Furthermore, this ratio also proves to be rather insensitive to variations in the axial mass and the Pauli blocking parameter. This is the first time that this ratio has been experimentally reported. We believe this measurement will aid the theoretical physics community to test various model predictions of neutrino-nucleon/nucleus interactions.
| Author | : |
| Publisher | : |
| Total Pages | : 134 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Download A Measurement of the Neutral Current Neutrino-nucleon Elastic Cross Section at MiniBooNE. Book in PDF, ePub and Kindle
The neutral current neutrino-nucleon elastic interaction [nu] N → [nu] N is a fundamental process of the weak interaction ideally suited for characterizing the structure of the nucleon neutral weak current. This process comprises ≈18% of neutrino events in the neutrino oscillation experiment, MiniBooNE, ranking it as the experiment's third largest process. Using ≈10% of MiniBooNE's available neutrino data, a sample of these events were identified and analyzed to determine the differential cross section as a function of the momentum transfer of the interaction, Q2. This is the first measurement of a differential cross section with MiniBooNE data. From this analysis, a value for the nucleon axial mass M{sub A} was extracted to be 1.34 ± 0.25 GeV consistent with previous measurements. The integrated cross section for the Q2 range 0.189 → 1.13 GeV2 was calculated to be (8.8 ± 0.6(stat) ± 0.2(syst)) x 10−4° cm2.
| Author | : Ranjan Dharmapalan |
| Publisher | : |
| Total Pages | : 158 |
| Release | : 2012 |
| Genre | : Electronic dissertations |
| ISBN | : |
Download Antineutrino Neutral Current Interactions in MiniBooNE Book in PDF, ePub and Kindle
The antineutrino nucleon neutral current elastic scattering cross section measured at the MiniBooNE experiment is reported. The data set corresponds to 10.1 × 1020 protons on target which is a world record neutral current elastic antineutrino sample. An antineutrino to neutrino neutral current scattering cross section ratio is measured after accounting for all associated errors. This is the first time such a ratio has been experimentally reported. Previous MiniBooNE neutrino cross section measurements have indicated a higher value for the axial mass, M, as compared to the nominal value of M_A=1.0 GeV. A Chi^2 test was performed to find the best value of M_A which matches the antineutrino neutral current elastic data. Finally, an exciting possibility to search for dark matter in the MiniBooNE experiment, using the neutral current interactions is discussed.
| Author | : |
| Publisher | : |
| Total Pages | : 161 |
| Release | : 2005 |
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| ISBN | : |
Download A Measurement of the Neutrino Neutral Current ?0 Cross Section at MiniBooNE. Book in PDF, ePub and Kindle
The MiniBooNE neutrino beam and detector at Fermilab are used to study the production of neutral current ?0 events. The cross sections for neutrino interactions with mineral oil (CH2) are reported for resonantly produced and coherently produced single ?0 events. We measure a resonant single ?0 cross section of ?(v? N ?0) = (0.0129 ± 0.0011(stat.) ± 0.0043(syst.)) x 10-36 cm2/CH2 at a mean neutrino energy of 1.26 GeV. We measure a coherent single ?0 cross section of ?(v? A → v? A ?0) = (0.00077 ± 0.00016 (stat.) ± 0.00036 (syst.)) x 10-36 cm2/CH2 at mean neutrino energy 1.12 GeV.
| Author | : |
| Publisher | : |
| Total Pages | : 350 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Download A Measurement of the Muon Neutrino Charged Current Quasielastic Interaction and a Test of Lorentz Violation with the MiniBooNE Experiment Book in PDF, ePub and Kindle
The Mini-Booster neutrino experiment (MiniBooNE) at Fermi National Accelerator Laboratory (Fermilab) is designed to search for [nu]{sub [mu]} → [nu]{sub e} appearance neutrino oscillations. Muon neutrino charged-current quasi-elastic (CCQE) interactions ([nu]{sub {mu}} + n → {mu} + p) make up roughly 40% of our data sample, and it is used to constrain the background and cross sections for the oscillation analysis. Using high-statistics MiniBooNE CCQE data, the muon-neutrino CCQE cross section is measured. The nuclear model is tuned precisely using the MiniBooNE data. The measured total cross section is [sigma] = (1.058 ± 0.003 (stat) ± 0.111 (syst)) x 10−38 cm2 at the MiniBooNE muon neutrino beam energy (700-800 MeV). [nu]{sub e} appearance candidate data is also used to search for Lorentz violation. Lorentz symmetry is one of the most fundamental symmetries in modern physics. Neutrino oscillations offer a new method to test it. We found that the MiniBooNE result is not well-described using Lorentz violation, however further investigation is required for a more conclusive result.
| Author | : |
| Publisher | : |
| Total Pages | : 163 |
| Release | : 2005 |
| Genre | : |
| ISBN | : |
Download A Measurement of the Neutrino Neutral Current 0 Cross Section at MiniBooNE Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 135 |
| Release | : 2011 |
| Genre | : |
| ISBN | : |
Download A Measurement of Neutrino Charged Current Interactions and a Search for Muon Neutrino Disappearance with the Fermilab Booster Neutrino Beam Book in PDF, ePub and Kindle
In this thesis, we report on a measurement of muon neutrino inclusive charged current interactions on carbon in the few GeV region, using the Fermilab Booster Neutrino Beam. The all neutrino mode data collected in the SciBooNE experiment is used for this analysis. We collected high-statistics CC interaction sample at SciBooNE, and extracted energy dependent inclusive charged current interaction rates and cross sections for a wide energy range from 0.25 GeV to 3̃ GeV. We measure the interaction rates with 6-15% precision, and the cross sections with 10-30% precision. We also made an energy integrated measurements, with the precisions of 3% for the rate, and 8% for the cross section measurements. This is the first measurement of the CC inclusive cross section on carbon around 1 GeV. This inclusive interaction measurement is nearly free from effects of hadron re-interactions in the nucleus. Hence, it is complementary to other exclusive cross section measurements, and essential to understand the neutrino interaction cross sections in the few GeV region, which is relevant to ongoing and future neutrino oscillation experiments. This analysis also provides the normalization for SciBooNE's previous cross section ratio measurements for charged current coherent pion production and neutral current neutral pion production. Then, a precise comparison between our previous measurements and the model predictions becomes possible. The result of the interaction rate measurement is used to constrain the product of the neutrino flux and the cross section at the other experiment on the Fermilab Booster Neutrino Beam: Mini-BooNE. We conducted a search for short-baseline muon neutrino disappearance using data both from SciBooNE and MiniBooNE, to test a possible neutrino oscillation with sterile neutrinos which is suggested by the LSND experiment. With this constraint by SciBooNE, we significantly reduced the flux and the cross section uncertainties at MiniBooNE, and achieved the world best sensitivity for the v? disappearance at 0.5 ?msup2/sup 30 (eV
| Author | : Geralyn P. Zeller |
| Publisher | : American Institute of Physics |
| Total Pages | : 366 |
| Release | : 2008-01-15 |
| Genre | : Science |
| ISBN | : 9780735404847 |
Download Neutrino-Nucleus Interactions in the Few-Gev Region Book in PDF, ePub and Kindle
NuInt07, the fifth in a series of international workshops, was held at Fermi National Accelerator Laboratory in Batavia, IL. It was the successful continuation of a series of workshops focused solely on the understanding and measurement of low energy neutrino-nucleus interactions. Neutrino cross sections in the few-GeV energy range are an important ingredient for neutrino oscillation experiments as well as being interesting in their own right. Such measurements and their accompanying theoretical calculations had not been updated for decades. The goal of this workshop series has been to remedy this situation by providing an environment where both experimentalists and theorists in nuclear and high energy physics can come together to review and discuss recent progress in neutrino-nucleus measurements and calculations.
