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 1WLA: Antiproton Physics: Fundamental Symmetries, Hadron Structure, and the Universe I |
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Chair: Makoto Fujiwara, TRIUMF Room: Hilton Queen's 5 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WLA.00001: Antimatter in the Universe Invited Speaker: Peter von Ballmoos Balloon and satellite experiments detect antimatter in the Universe both directly, as a cosmic ray component, and indirectly, through characteristic annihilation signatures. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WLA.00002: Status of laser spectroscopy of antiprotonic and pionic helium atoms Invited Speaker: Masaki Hori The Atomic Spectroscopy and Collisions Using Slow Antprotons (ASACUSA) collaboration at CERN's Antiproton Decelerator is carrying out laser spectroscopy experiments to measure the atomic transition frequencies of antiprotonic helium. Techniques such as sub-Doppler two-photon laser spectroscopy and buffer-gas cooling of the atoms to cryogenic temperature T=1.5--1.7 K are employed to measure the frequencies to a precision of 2.5 parts in $10^9$. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was determined as 1836.1526734(15). The data has also been used to constrain exotic fifth forces that may exist at the 1 Angstrom length scale. Experiments were carried out to further improve the experimental precision in the last 3 years. Future experiments employing the high-quality antiproton beam provided by the Extra Low Energy Antiproton Ring (ELENA) facility now being commissioned at CERN will also be described. Pionic helium is a heretofore hypothetical long-lived atom composed of a helium nucleus, an electron, and a negatively-charged pion occupying a Rydberg state. Laser spectroscopy of this object was attempted in an experiment carried out using the high-intensity pion beam of the 590 MeV ring cyclotron facility of the Paul Scherrer Institute (PSI). Data analysis is ongoing. |
Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WLA.00003: High-precision comparisons of the fundamental properties of matter/antimatter conjugates Invited Speaker: Stefan Ulmer One of the hot topics of modern physics is the matter/antimatter asymmetry observed on cosmological scales, which is in contradiction to the charge-parity-time reversal invariance of the relativistic quantum field theories of the standard model of particle physics. This inspires comparisons of the fundamental properties of conjugate matter/antimatter systems at low energy and with great precision. Experiments at the antiproton decelerator of CERN contribute to this branch of physics, among them are high precision studies of the fundamental properties of protons and antiprotons by the BASE collaboration and measurements on the ground state hyperfine splitting of antihydrogen by the ASACUSA collaboration. |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WLA.00004: COFFEE BREAK
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