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A Novel Measurement of the Anomalous Muon Spin Precession Frequency in the Muon g − 2 Experiment at Fermilab
A Novel Measurement of the Anomalous Muon Spin Precession Frequency in the Muon g − 2 Expe...
A Novel Measurement of the Anomalous Muon Spin Precession Frequency in the Muon g − 2 Experiment at Fermilab

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105639
ISBN  
9798273307629
DDC  
593.7
저자명  
Barrett, Tyler.
서명/저자  
A Novel Measurement of the Anomalous Muon Spin Precession Frequency in the Muon g − 2 Experiment at Fermilab
발행사항  
[Sl] : Cornell University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
361 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-07, Section: B.
주기사항  
Advisor: Gibbons, Lawrence.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2025.
초록/해제  
요약The Muon g − 2 Experiment operated at Fermi National Accelerator Laboratory (FNAL, or Fermilab) between 2018 and 2023 to produce the world's most precise measurement of the muon's anomalous magnetic moment, aµ = gµ−2 2 , which expresses the relative deviation in the muon's g-factor from a baseline theoretical expectation that gµ = 2. In the Standard Model of particle physics, gµ 2 and hence aµ 0 by a calculable amount that depends on all possible interactions between the muon and all other fundamental particles, including any potentially undiscovered interactions beyond the Standard Model. For this reason, measurements of the electron anomaly ae and later the muon anomaly aµ have helped guide the development of the Standard Model since the inception of quantum field theory, and the measured value of aµ provides a valuable constraint for new hypotheses that extend the Standard Model. As of 2006, the leading measurement and Standard Model prediction for aµ exhibited tension at the level of about three standard deviations, motivating an improved measurement at Fermilab that could test the tension more precisely. The experiment functions by storing a polarized beam of µ + in a uniform magnetic field, which simultaneously induces circular motion and spin precession. As the stored muons undergo the Michel decay µ + → e + +νe + ¯νµ, mediated by the parity-violating weak interaction, the rest-frame e + emission direction is correlated with the parent µ + spin orientation. Boosting into the laboratory frame encodes this correlation in the decay e + energy, which is higher when the emission (i.e. µ + spin direction) is aligned with the µ + momentum, and lower when opposite. Detectors then count the rate of high-energy decay e +, which modulates at the difference between the µ + revolution and spin precession frequencies. This observed frequency, called the anomalous spin precession frequency ωa, is directly proportional to aµ. The extraction of ωa proceeds by fitting the time spectrum of detected e +, which requires precise modeling of the ωa oscillation as well as any perturbations from beam dynamics and detector acceptance. Using the ωa analysis presented in this work, based on Runs 4 - 6 of the Muon g − 2 Experiment at Fermilab, we find that aµ = 0.001 165 920 738(162) with a relative uncertainty of 139 parts per billion.
일반주제명  
Particle physics
일반주제명  
Electromagnetics
일반주제명  
Applied mathematics
일반주제명  
Theoretical physics
키워드  
Anomaly
키워드  
Magnetic moment
키워드  
Muon
키워드  
Spin precession
기타저자  
Cornell University Physics
기본자료저록  
Dissertations Abstracts International. 87-07B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aBarrett,  Tyler.
■24512▼aA  Novel  Measurement  of  the  Anomalous  Muon  Spin  Precession  Frequency  in  the  Muon  g  −  2  Experiment  at  Fermilab
■260    ▼a[Sl]▼bCornell  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
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■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-07,  Section:  B.
■500    ▼aAdvisor:  Gibbons,  Lawrence.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2025.
■520    ▼aThe  Muon  g  −  2  Experiment  operated  at  Fermi  National  Accelerator  Laboratory  (FNAL,  or  Fermilab)  between  2018  and  2023  to  produce  the  world's  most  precise  measurement  of  the  muon's  anomalous  magnetic  moment,  aµ  =  gµ−2  2  ,  which  expresses  the  relative  deviation  in  the  muon's  g-factor  from  a  baseline  theoretical  expectation  that  gµ  =  2.  In  the  Standard  Model  of  particle  physics,  gµ    2  and  hence  aµ    0  by  a  calculable  amount  that  depends  on  all  possible  interactions  between  the  muon  and  all  other  fundamental  particles,  including  any  potentially  undiscovered  interactions  beyond  the  Standard  Model.  For  this  reason,  measurements  of  the  electron  anomaly  ae  and  later  the  muon  anomaly  aµ  have  helped  guide  the  development  of  the  Standard  Model  since  the  inception  of  quantum  field  theory,  and  the  measured  value  of  aµ  provides  a  valuable  constraint  for  new  hypotheses  that  extend  the  Standard  Model.  As  of  2006,  the  leading  measurement  and  Standard  Model  prediction  for  aµ  exhibited  tension  at  the  level  of  about  three  standard  deviations,  motivating  an  improved  measurement  at  Fermilab  that  could  test  the  tension  more  precisely. The  experiment  functions  by  storing  a  polarized  beam  of  µ  +  in  a  uniform  magnetic  field,  which  simultaneously  induces  circular  motion  and  spin  precession.  As  the  stored  muons  undergo  the  Michel  decay  µ  +  →  e  +  +νe  +  ¯νµ,  mediated  by  the  parity-violating  weak  interaction,  the  rest-frame  e  +  emission  direction  is  correlated  with  the  parent  µ  +  spin  orientation.  Boosting  into  the  laboratory  frame  encodes  this  correlation  in  the  decay  e  +  energy,  which  is  higher  when  the  emission  (i.e.  µ  +  spin  direction)  is  aligned  with  the  µ  +  momentum,  and  lower  when  opposite.  Detectors  then  count  the  rate  of  high-energy  decay  e  +,  which  modulates  at  the  difference  between  the  µ  +  revolution  and  spin  precession  frequencies.  This  observed  frequency,  called  the  anomalous  spin  precession  frequency  ωa,  is  directly  proportional  to  aµ.  The  extraction  of  ωa  proceeds  by  fitting  the  time  spectrum  of  detected  e  +,  which  requires  precise  modeling  of  the  ωa  oscillation  as  well  as  any  perturbations  from  beam  dynamics  and  detector  acceptance.  Using  the  ωa  analysis  presented  in  this  work,  based  on  Runs  4  -  6  of  the  Muon  g  −  2  Experiment  at  Fermilab,  we  find  that  aµ  =  0.001  165  920  738(162)  with  a  relative  uncertainty  of  139  parts  per  billion.
■590    ▼aSchool  code:  0058.
■650  4▼aParticle  physics
■650  4▼aElectromagnetics
■650  4▼aApplied  mathematics
■650  4▼aTheoretical  physics
■653    ▼aAnomaly
■653    ▼aMagnetic  moment
■653    ▼aMuon
■653    ▼aSpin  precession
■690    ▼a0798
■690    ▼a0753
■690    ▼a0607
■690    ▼a0364
■71020▼aCornell  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-07B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360925▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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