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antihydrogen
Antihydrogen is the antimatter counterpart of hydrogen. Whereas the common hydrogen atom is composed of an electron and proton, the antihydrogen atom is made up of a positron and antiproton. Antihydrogen was produced artificially in particle accelerators, at energies too high for detailed study. CERN experiments created low energy antimatter and trapped atoms for precision studies. Scientists hope studying antihydrogen may shed light on the baryon asymmetry problem or why there is more matter than antimatter in the universe.〔(BBC News – Antimatter atoms are corralled even longer ). Bbc.co.uk. Retrieved on 2011-06-08.〕
The standard symbol for antihydrogen is .
==Experimental history==
Accelerators detected hot antihydrogen in the 1990s. ATHENA studied cold in 2002. It was first trapped by the Antihydrogen Laser Physics Apparatus (ALPHA) team at CERN〔Eugenie Samuel Reich, ("Antimatter held for questioning" ), ''Nature News'' 2010-11-17, accessed 2010-11-20〕〔(eiroforum.org – CERN: Antimatter in the trap ), December 2011, accessed 2012-06-08〕 in 2010, who then measured the structure and other important properties.〔(Internal Structure of Antihydrogen probed for the first time ). March 7, 2012.〕 ALPHA, AEGIS, and GBAR plan to further cool and study atoms.
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