자료유형  

 학위논문

Control Number  

0017161519

International Standard Book Number  

9798342102490

Dewey Decimal Classification Number  

535

Main Entry-Personal Name  

Chen, Jijun.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

75 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: A.

General Note  

Advisor: Koltick, David.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2024.

Summary, Etc.  

요약The Mu2e experiment is searching for Beyond-Standard-Model, Charged Lepton Flavor Violation (CLFV) in the muon capture reaction μ − + Al → e− + Al. To compare the accessible energy scale of this experiment, the Large Hadron Collider (LHC) is capable of observing new physics at the few TeV mass scale. However, by searching for μ-to-e conversion at a branching ratio sensitivity of 10 −17, Mu2e will probe for new physics at mass scales up to 10 3 ∼ 10 4 TeV, far beyond the reach of any planned accelerator and surpassing the current world's best limit by 10 4 times. In addition, there is no competing Standard Model process that produces this decay to a branching ratio level 10 −54.To report a reliable result, the number of stopped muons will be normalized to 10% precision utilizing two γ-ray transitions and one x-ray atomic transition. The first, directly proportional to the CLFV signal, is the 1808.7 keV γ-ray emitted promptly in the muon capture process.The second, the 2p→1s atomic transition of muonic aluminum, is the 346.8 keV x-ray line. The third, is the 844 keV γ-ray from the β-decay process.These signals need to be measured in the presence of an energy flux background of 3.2 x 10 8 TeV/sec, consisting of muons, electrons, neutrons, x-rays and γ-rays. Here, two com- 11 photon counting detectors are used in the luminosity measurement. One of them, the LaBr 3detector, is capable of high rate operation up to and above 800 kcps and energy resolution of 0.7%, producing highly accurate statistical measurements. The other, the HPGe detector is capable of energy resolution of 0.1%, with limited rate capability ∼ 70 kcps, yet producing measurements having low systematic error.Once signals are found within the background, corrections must be understood and applied including: geometric factors, detector efficiency, branching ratio of the observed physics pro- cesses, signal loss due to propagation to the detector, interfering lines, event loss due to pile-up, event loss due to algorithm miscalculation, time evolution of the signal, and others. The normalization measurement will be reported out in real time every 5 to 10 minutes, and a comprehensive off-line analysis will be undertaken using merged data sets.

Subject Added Entry-Topical Term  

Spectrum analysis.

Subject Added Entry-Topical Term  

Design engineering.

Subject Added Entry-Topical Term  

Aluminum.

Subject Added Entry-Topical Term  

Copper.

Subject Added Entry-Topical Term  

Neutrinos.

Subject Added Entry-Topical Term  

Energy.

Subject Added Entry-Topical Term  

Geometry.

Subject Added Entry-Topical Term  

Radiation.

Subject Added Entry-Topical Term  

X-rays.

Subject Added Entry-Topical Term  

Analytical chemistry.

Subject Added Entry-Topical Term  

Astrophysics.

Subject Added Entry-Topical Term  

Atomic physics.

Subject Added Entry-Topical Term  

Design.

Subject Added Entry-Topical Term  

Optics.

Subject Added Entry-Topical Term  

Particle physics.

Subject Added Entry-Topical Term  

Engineering.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 86-04A.

Electronic Location and Access  

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Control Number  

joongbu:655451