CERN Accelerating science

Talk
Title	Production and detection of cold antihydrogen atoms
Related title	First Production of Cold Antihydrogen Atoms : video lecture
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Author(s)	Amoretti, M ; Amsler, Claude ; Bonomi, G ; Bouchta, A ; Bowe, P ; Carraro, C ; Cesar, C L ; Charlton, M ; Collier, M ; Doser, Michael ; Filippini, V ; Fine, K S ; Fontana, A ; Fujiwara, M C ; Funakoshi, R ; Genova, P ; Hangst, J S ; Hayano, R S ; Holzscheiter, M H ; Jørgensen, L V ; Lagomarsino, V ; Landua, Rolf ; Landua, Rolf (speaker) (CERN) ; Lindelöf, D ; Lodi Rizzini, E ; Macri, M ; Madsen, N ; Manuzio, G ; Marchesotti, M ; Montagna, P ; Pruys, H S ; Regenfus, C ; Riedler, P ; Rochet, J ; Rotondi, A ; Rouleau, G ; Testera, G ; Van der Werf, D P ; Variola, A ; Watson, T L
Affiliation	(CERN)
Corporate author(s)	CERN. Geneva
Imprint	Sep 2002. - 3586.
Series	(CERN Particle Physics Seminar ; 2000-2009)
Note	CERN, Geneva, 24 Sep 2002
Lecture note	Talk on 24 Sep 2002 at 16:30
Presented at	CERN Particle Physics Seminars, CERN, Geneva, Switzerland, 1 Jan 2000 - 31 Dec 2009
Subject category	Other Fields of Physics
Accelerator/Facility, Experiment	CERN AD ; ATHENA AD-1
Keywords	ATHENA ; antimatter
Abstract	A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be invariant under the combined discrete operations of charge conjugation, parity and time reversal. Antimatter, the existence of which was predicted by Dirac, can be used to test the CPT theorem experimental investigations involving comparisons of particles with antiparticles are numerous. Cold atoms and anti-atoms, such as hydrogen and anti-hydrogen, could form the basis of a new precise test, as CPT invariance implies that they must have the same spectrum. Observations of antihydrogen in small quantities and at high energies have been reported at the European Organization for Nuclear Research (CERN) and at Fermilab, but were not suited to precision comparison measurements. Here we demonstrate the production of antihydrogen atoms at very low energy by mixing trapped antiprotons and positrons in a cryogenic environment. The neutral anti-atoms have been detected directly when they escape the trap and annihilate, producing a characteristic signature in an imaging particle detector. The ATHENA experiment at the Antiproton Decelerator (AD) has recently observed the production of large numbers of cold antihydrogen atoms. The talk will give an overview about the key ingredients of the apparatus and the first results obtained on antihydrogen production, followed by a short outlook on future developments.
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