Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 2WDB: Fundamental Physics at Low Energy IV |
Hide Abstracts |
Chair: David Hertzog, University of Washington Room: Hilton Kohala 3 |
Tuesday, October 23, 2018 4:00PM - 4:30PM |
2WDB.00001: The Muon g-2 experiment at Fermilab Invited Speaker: Kim Siang Khaw The E989 collaboration at Fermilab aims to resolve the long-standing muon g-2 puzzle by performing a four times more precise measurement (140 ppb) than its predecessor of E821 collaboration at Brookhaven National Lab (540 ppb). After completing the commissioning run in February 2018, the E989 collaboration has accumulated a dataset that is larger than the total statistics collected by the E821 collaboration. In this talk, the current status of the experiment, especially on the measurement of the muon spin precession frequency, the magnetic field and the muon distribution will be presented. Preliminary blinded results from these measurements will also be discussed together with the future plan of the experiment. |
Tuesday, October 23, 2018 4:30PM - 5:00PM |
2WDB.00002: Muon g-2/EDM Experiment at J-PARC Invited Speaker: Seonho Choi At J-PARC of Japan, a new, very different approach is in progress to measure the magnetic moment anomaly g-2 and the electric dipole moment(EDM) of the muon. Currently, there is a larger than 3 sigma discrepancy between the Standard Model prediction and the experimental value for g-2. New experiments for muon g-2 aims to reduce experimental errors by at least factor 3 from the previous 0.46 ppm. The new method at J-PARC involves muons orbiting in a pure magnetic field without any focusing electric field. This requires a muon beam of low emittance which can be achieved by stopping the secondary muon beams and re-accelerating them. This releases the constraint on the so-called magic momentum and makes it possible for a compact muon storage. The surface muons from pion decay are collected and stopped inside the silica aerogel target, where they form neutral muonium, which diffuses out to vacuum with only thermal motion. An external laser then ionizes the neutral muonium to have muons back at low emittance for re-acceleration to 300 MeV/c. The accelerated muons are injected into storage magnet for observation of the spin precession. The direction of the muon spin can be determined by decay positrons with relatively high energy. The decay positrons will be detected and their trajectories are reconstructed by silicon detectors in the shape of vanes inside the muon storage area. The magnetic moment anomaly g-2 can be measured by the additional spin precession with respect to the momentum of the muon, while up-down asymmetry of the high energy positrons is sensitive to the EDM. The stopping and re-accelerating muon beams necessitate a considerable amount of R&D and progresses are made at various components of the experiment. The uniformity and stability of the storage magnetic field necessary for the pursued precision also require some new idea. The presentation will be focused on the overview, current status and future prospects for J-PARC muon g-2/edm experiment. |
Tuesday, October 23, 2018 5:00PM - 5:30PM |
2WDB.00003: Measurement of hyperfine splitting of muonium at J-PARC Invited Speaker: K. Shimomura Placeholder
|
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700