History of Investigation of Naked Charm Particles, Which Was Discovered by 2-Fold Emulsion Tracker
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概要
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Naked charm particle, which contain singly the 4-th quark, charm or anti-charm, was discovered in 1971, in Japan, in a cosmic ray experiment using 2-fold emulsion trackers. It was 3 years in advance of discovery of hidden charm particle J/Ψ in United States, which consists of a pair of charm and anti-charm quarks. In 1975, we again discovered artificially produced naked charm particles produced by an accelerator at Fermilab. In the same year, we pointed out lifetime difference of a factor of 2-3 between charged and neutral components of charm particles produced by cosmic rays. A decade later, we reconfirmed this lifetime difference by an experiment in accelerator field using so called hybrid apparatus, which consists of 2-fold emulsion trackers and electronic detectors. Furthermore, we discovered 2 peculiar events, in which 2 pairs of charm particles (4 charm particles) in a same interaction, by another hybrid experiment at CERN. All of those results are remarkable ones in the history of charm physics.
- 社団法人 日本写真学会の論文
社団法人 日本写真学会 | 論文
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