@article {86,
	title = {Efficient antihydrogen detection in antimatter physics by deep learning},
	journal = {Journal of Physics Communications},
	volume = {1},
	year = {2017},
	pages = {025001},
	abstract = {Antihydrogen is at the forefront of antimatter research at the CERN Antiproton Decelerator. Experiments aiming to test the fundamental CPT symmetry and antigravity effects require the efficient detection of antihydrogen annihilation events, which is performed using highly granular tracking detectors installed around an antimatter trap. Improving the efficiency of the antihydrogen annihilation detection plays a central role in the final sensitivity of the experiments. We propose deep learning as a novel technique to analyze antihydrogen annihilation data, and compare its performance with a traditional track and vertex reconstruction method. We report that the deep learning approach yields significant improvement, tripling event coverage while simultaneously improving performance in terms of AUC by 5\%.},
	url = {http://stacks.iop.org/2399-6528/1/i=2/a=025001},
	author = {P Sadowski and B Radics and Ananya and Y Yamazaki and P Baldi}
}
@article {73,
	title = {Antihydrogen level population evolution: impact of positron plasma length},
	journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
	volume = {49},
	year = {2016},
	pages = {064007},
	abstract = {Antihydrogen is produced by mixing an antiproton and a positron plasma in a cryogenic electromagnetic trap. The dominant antihydrogen formation mechanism is three-body recombination, while the subsequent level population evolution is governed by various processes, mainly collisional (de)excitation, ionisation and radiative decay. In this work the impact of various positron plasma lengths on the level population evolution is investigated. The main interest is the ground-state antihydrogen atom yield. It is found that the ground state level population shows different power-law behaviors at short or longer positron plasma lengths.},
	url = {http://stacks.iop.org/0953-4075/49/i=6/a=064007},
	author = {B Radics and Y Yamazaki}
}
@article {28,
	title = {Positron accumulation and manipulation for antihydrogen synthesis},
	journal = {Journal of Physics: Conference Series},
	volume = {225},
	year = {2010},
	pages = {012018},
	abstract = {<p>Our group ASACUSA-MUSASHI has established an efficient way for accumulating antiprotons in the cusp trap, a combination of an anti-Helmholz superconducting coil and a multi-ring electrode trap. The last piece for synthesizing antihydrogens in the cusp trap is positron. We have developed a compact system to effectively accumulate positrons based on N 2 gas-buffer scheme with a specially designed high precision cylindrical multi-ring electrode trap. Millions of positrons were accumulated in the pre-accumulator just using polycrystalline tungsten moderators. The accumulated positrons were transported as a pulsed beam via three guiding coils and caught in the cusp trap under cryogenic and ultra high vacuum conditions without serious loss. Confinement of two kinds of numerous antiparticles, e.g., 10 8 positrons and 10 7 antiprotons, in the cusp trap becomes feasible.</p>
},
	url = {http://stacks.iop.org/1742-6596/225/i=1/a=012018},
	author = {H Imao and K Michishio and Y Kanai and N Kuroda and Y Enomoto and H Higaki and K Kira and A Mohri and H A Torii and Y Nagata and C Kim and Y Matsuda and Y Nagashima and Y Yamazaki}
}
