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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 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
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105639
■006m o d
■007cr#unu||||||||
■020 ▼a9798273307629
■035 ▼a(MiAaPQ)AAI32396058
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a593.7
■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
■300 ▼a361 p
■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.


