Energy Integrated Ratio Analysis of the Anomalous Precession Frequency in the Fermilab Muon g-2 Experiment
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Doctor of Philosophy (PhD)
Arts and Sciences
Physics and Astronomy
Dr. Tim Gorringe
The muon’s anomalous magnetic moment, aμ, provides a unique way for probing physics beyond the standard model experimentally as it gathers contributions from all the known and unknown forces and particles in nature. The theoretical prediction of aμ has been in greater than 3 σ tension with the experimental measurement since the results of the Muon g-2 Experiment at the Brookhaven National Laboratory (E-821) were published in the early 2000s with a precision of 540 ppb. To settle this tension, the new Fermilab Muon g - 2 Experiment (E-989) is currently taking data with the aim of experimentally determining aμ with a final precision of 140 ppb. The determination of aμ involves measuring the magnetic field in which the muons undergo spin precession and the anomalous part of the spin precession frequency, ωa . We use a new reconstruction approach called the energy integrating method in which the total energy of the decay positrons deposited in the electromagnetic calorimeters is continuously recorded. This reconstruction method for the ωa analysis has different sensitivity to some of the major systematic biases compared to the traditional method which reconstructs individual positron events. Furthermore, we employ a ratio histogramming procedure that has reduced sensitivity to slow variations in the data. In this dissertation the muon g-2 experiment at Fermilab is described followed by a detailed discussion of the Run-2 and Run-3 precession frequency data analysis using the new energy integrating ratio histogramming method.
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This study was supported by the National Science Foundation award number 1807266 from 2018 to 2022 and the Max Steckler Fellowship in 2017.
Chakraborty, Ritwika, "Energy Integrated Ratio Analysis of the Anomalous Precession Frequency in the Fermilab Muon g-2 Experiment" (2022). Theses and Dissertations--Physics and Astronomy. 103.
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