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Measuring Neutrino Oscillations With NOvA and T2K
Measuring Neutrino Oscillations With NOvA and T2K
Measuring Neutrino Oscillations With NOvA and T2K

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자료유형  
 학위논문 서양
최종처리일시  
20260202104754
ISBN  
9798290653433
DDC  
539.721
저자명  
Raj, Varun Ranga.
서명/저자  
Measuring Neutrino Oscillations With NOvA and T2K
발행사항  
[Sl] : California Institute of Technology, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
139 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Patterson, Ryan.
학위논문주기  
Thesis (Ph.D.)--California Institute of Technology, 2025.
초록/해제  
요약The discoveries of the twentieth century proved that neutrinos have mass and can change flavor. For the past few decades, a major focus of research has been the measurement of the physical parameters which govern this flavor oscillation. These measurements remain inconclusive on a few key questions, including the ordering of the neutrino masses and whether neutrinos violate \uD835\uDC36\uD835\uDC43 symmetry. NOvA and T2K are two long-baseline accelerator neutrino experiments working in this space. By placing detectors in a beam of muon (anti-)neutrinos, these experiments interrogate neutrino oscillations by measuring (-)\uD835\uDF08\uD835\uDF07 disappearance and (-)\uD835\uDF08\uD835\uDC52 appearance. The complementarity of NOvA's and T2K's oscillation measurements motivated the experiments to pursue a joint oscillation analysis. After bracketing the potential impacts of correlations between the two experiments' systematic uncertainties and constructing a joint likelihood function, we share in this thesis the first results from the NOvA-T2K joint oscillation analysis. We report the world's most precise measurement of Δ\uD835\uDC5A232 to date: +2.429+0.039−0.035 (−2.477 ± 0.035) x 10−3 eV2 assuming the normal (inverted) mass ordering, showing a slight preference for the inverted mass ordering. The maximally \uD835\uDC36\uD835\uDC43- violating value of \uD835\uDEFF\uD835\uDC36\uD835\uDC43 = + \uD835\uDF0B/2 is excluded by 3\uD835\uDF0E credible intervals, and if we assume neutrinos are in the inverted mass ordering, we see evidence of \uD835\uDC36\uD835\uDC43 violation at 3\uD835\uDF0E.Additionally, we present an effort to encapsulate neutrino cross-section models in a parametrization-agnostic way. We have created a suite of systematic parameters that are capable of mimicking the action of NOvA's cross-section model. This method could be used in a future joint data analysis between long-baseline neutrino experiments. We also introduce Voronoi histograms, an ancillary technique developed as part of this program. Voronoi histograms are a new way to efficiently bin high-dimensional data. This method preserves bin density in regions of interest, while tightly controlling the total number of bins used. The performance gains from using Voronoi binning's over standard rectangular binning's scale dramatically with the dimensionality of the data.
일반주제명  
Neutrinos
일반주제명  
Cosmic rays
일반주제명  
Energy
일반주제명  
Particle physics
키워드  
Neutrino oscillation
키워드  
Cosmic rays
기타저자  
California Institute of Technology Physics Mathematics and Astronomy
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a539.721
■1001  ▼aRaj,  Varun  Ranga.
■24510▼aMeasuring  Neutrino  Oscillations  With  NOvA  and  T2K
■260    ▼a[Sl]▼bCalifornia  Institute  of  Technology▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a139  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Patterson,  Ryan.
■5021  ▼aThesis  (Ph.D.)--California  Institute  of  Technology,  2025.
■520    ▼aThe  discoveries  of  the  twentieth  century  proved  that  neutrinos  have  mass  and  can  change  flavor.  For  the  past  few  decades,  a  major  focus  of  research  has  been  the  measurement  of  the  physical  parameters  which  govern  this  flavor  oscillation.  These  measurements  remain  inconclusive  on  a  few  key  questions,  including  the  ordering  of  the  neutrino  masses  and  whether  neutrinos  violate  \uD835\uDC36\uD835\uDC43  symmetry.  NOvA  and  T2K  are  two  long-baseline  accelerator  neutrino  experiments  working  in  this  space.  By  placing  detectors  in  a  beam  of  muon  (anti-)neutrinos,  these  experiments  interrogate  neutrino  oscillations  by  measuring  (-)\uD835\uDF08\uD835\uDF07  disappearance  and  (-)\uD835\uDF08\uD835\uDC52  appearance.  The  complementarity  of  NOvA's  and  T2K's  oscillation  measurements  motivated  the  experiments  to  pursue  a  joint  oscillation  analysis.  After  bracketing  the  potential  impacts  of  correlations  between  the  two  experiments'  systematic  uncertainties  and  constructing  a  joint  likelihood  function,  we  share  in  this  thesis  the  first  results  from  the  NOvA-T2K  joint  oscillation  analysis.  We  report  the  world's  most  precise  measurement  of  Δ\uD835\uDC5A232  to  date:  +2.429+0.039−0.035  (−2.477  ±  0.035)  x  10−3  eV2  assuming  the  normal  (inverted)  mass  ordering,  showing  a  slight  preference  for  the  inverted  mass  ordering.  The  maximally  \uD835\uDC36\uD835\uDC43-  violating  value  of  \uD835\uDEFF\uD835\uDC36\uD835\uDC43  =  +  \uD835\uDF0B/2  is  excluded  by  3\uD835\uDF0E  credible  intervals,  and  if  we  assume  neutrinos  are  in  the  inverted  mass  ordering,  we  see  evidence  of  \uD835\uDC36\uD835\uDC43  violation  at  3\uD835\uDF0E.Additionally,  we  present  an  effort  to  encapsulate  neutrino  cross-section  models  in  a  parametrization-agnostic  way.  We  have  created  a  suite  of  systematic  parameters  that  are  capable  of  mimicking  the  action  of  NOvA's  cross-section  model.  This  method  could  be  used  in  a  future  joint  data  analysis  between  long-baseline  neutrino  experiments.  We  also  introduce  Voronoi  histograms,  an  ancillary  technique  developed  as  part  of  this  program.  Voronoi  histograms  are  a  new  way  to  efficiently  bin  high-dimensional  data.  This  method  preserves  bin  density  in  regions  of  interest,  while  tightly  controlling  the  total  number  of  bins  used.  The  performance  gains  from  using  Voronoi  binning's  over  standard  rectangular  binning's  scale  dramatically  with  the  dimensionality  of  the  data.
■590    ▼aSchool  code:  0037.
■650  4▼aNeutrinos
■650  4▼aCosmic  rays
■650  4▼aEnergy
■650  4▼aParticle  physics
■653    ▼aNeutrino  oscillation
■653    ▼aCosmic  rays
■690    ▼a0798
■690    ▼a0791
■71020▼aCalifornia  Institute  of  Technology▼bPhysics,  Mathematics  and  Astronomy.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0037
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358805▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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