Conveners
Antimatter
- Joanna Peszka (ETH Zurich)
Antimatter
- Danielle Louise Hodgkinson (University of California Berkeley (US))
The ALPHA-g experiment at CERN recently made the first direct observation of the effect of gravity on the motion of antimatter [1]. The result – that antihydrogen falls towards the Earth – is consistent with Einstein’s Weak Equivalence Principle.
In ALPHA-g, antihydrogen is produced by combining antiproton and positron plasmas, each confined in Penning-Malmberg traps. Antihydrogen is...
The GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment at CERN, situated on the antiproton decelerator ring (AD), is aimed at investigating the free fall of antihydrogen atoms prepared at rest, as suggested by J. Walz and Th. Hänsch [1]. This experiment employs two trapped ions: one is a Be+ ion cooled via laser, while the other, an Hbar+ ion, undergoes cooling through...
Antimatter Experiment: gravity, Interferometry, Spectroscopy (AE$\bar{\hbox{g}}$IS) achieves pulsed production of antihydrogen using a charge-exchange reaction between antiproton and Rydberg positronium (an electron and a positron in a bound state). The AE$\bar{\hbox{g}}$IS experiment is used to probe antimatter bound systems for measurements of gravitational free fall and precision studies of...
The standard model of particle physics provides one of the currently best descriptions of nature but fails to account for the asymmetry between matter and antimatter that is observed on cosmological scales. One way to investigate this problem is the test of CPT-Invariance by comparisons between fundamental proton and antiproton properties. [1]
The BASE collaboration is specialized in the...
Cold-charged particles play an essential role in interstellar molecular formation, are present in many high-precision experiments, antimatter physics, and chemistry, and are also relevant for studies on the origin of biological homochirality. In this contribution, I will describe a system based on the Matrix Isolation Sublimation (MISu) technique [1],[2] to generate and trap these species in...
The hydrogen atom has been studied extensively throughout history and provides the most precisely measured systems in physics. Antihydrogen has a significantly shorter history of study but the same potential for precision physics measurements. Comparisons between hydrogen and antihydrogen then offer the possibility to test fundamental symmetries such as charge, parity, and time reversal (CPT)...
For CPT symmetry to be conserved, the energy spectrum of both matter and antimatter atoms should be identical. The ALPHA collaboration uses antihydrogen, the antimatter counterpart of hydrogen, to perform CPT symmetry tests.
Microwave spectroscopy techniques were applied in the ALPHA experiment to observe, for the first time, the transition between hyperfine energy levels of antihydrogen....
Understanding the origins of the cosmos has been a much sought after pursuit. One of the greatest mysteries is the composition of the universe itself, which deviates from the Standard Model predictions, since observations indicate that it is made almost entirely out of matter [1]. These observations paved the way for experiments that directly compare matter and antimatter, with the latest one...
