Professor of Physics, Applied Physics and Biomedical Engineering
University of Michigan
Randall Laboratory 450 Church Street
Ann Arbor, Michigan USA 48109
Tel: (1)-734-647-2514 Fax: (1)-734-764-5153
Physics 235 2013-2018
Links to Public Lecture Videos
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Professor Chupp and his group pursue a program that uses precision measurement techniques and symmetry principles in particle physics investigations and applies the technology developed for those investigations to a variety of endeavors. The primary current efforts include measurement of muon magnetic-moment anomaly (g-2) at FERMILAB, fundamental neutron physics and atomic and neutron electric-dipole-moment measurements.
Over recent decades experiment and theory have established the Standard Model of elementary particle interactions and developed a framework for precise calculations. In spite of this success, strong evidence that the Standard Model is incomplete is provided by three specific shortcomings: 1) we do not understand the origin of matter, that is how the early universe evolved to provide more matter than antimatter for planets, stars and galaxies to exist as observed today; 2) we do not know what constitutes the dark matter that comprises most of the mass of the observable universe; 3) we have not specified the quantum mechanics of neutrinos, the elusive elementary particles that accompany radioactive decay. It is clear that a New Standard Model must emerge and that it must be based on experiment. Chupplab research challenges precise Standard Model predictions and can provide solid signals of new physics by measuring the magnetic signature (magnetic-moment anomaly) of the muon, an exotic elementary particle that is produced in abundance at the Fermi National Accelerator Laboratory, and exquisitely measuring the shape of the neutron and the isotope 129Xe manifest in an electric-dipole moment (EDM). This work addresses the deepest questions that we can ask: what is matter made of, how did it come to be and how does it interact at the same time addressing the technical demands of the experiments by pushing the limits of magnetic field measurement. Many potential additional applications of these techniques may be extended into biology, neuroscience and medicine.
The measured g-2 of the muon differs from the Standard Model prediction by 2.5 parts-per-million (ppm), which is about 3.6 times the estimated combined uncertainly of experiment and theory. This is currently the strongest laboratory signal for new physics. The absolute and accurate measurement of the magnetic field at the 70 ppb (parts-per-billion) level is required to reduce the uncertainty by a factor of four, which would strengthen the signal a bona-fide discovery if the central value does not change. The challenge of precision absolute magnetometry has pushed the development of new techniques based on 3He. Combined with measurement of the magnetic moment of the 3He nucleus, this promises to establish a new standard and a new set of devices for measuring magnetic fields.
Time reversal invariance violation is manifest in the EDMs induced in the neutron and atoms by elementary particle interactions beyond the Standard Model that may hold the key to the origin of matter. The HeXe collaboration has worked to significantly improve our earlier work to measure the 129Xe EDM with 3He comagnetometry using SQUIDs and the world’s best magnetically shielded environments in Munich and Berlin, Germany. Recently we have improved our previous limit by a factor of five. Efforts to exploit the world’s strongest UCN sources at Los Alamos and ILL in Grenoble France are driving our work to push the neutron EDM sensitivity an order of magnitude and more.
Our group continues to work on applications of laser polarized 129Xe and 3He.
Eva Krageloh – muon g-2 and EDM
Felicity Blue Hills – neutron EDM
David Aguillard – 3He magnetometry
Alec Tewsley-Booth (muon g-2 magnetic field analysis)
Midhat Farooq – 3He magnetometry and muon g-2
Key Undergrads (2020-21)
ChuppLab firstname.lastname@example.org Natasha Midhat Alec Chelsea Eva Veronica Jonathan Scott Joe Richard Tim