Production & decay of charmed sigma particle. In this coloured bubble chamber photo,taken in 1974 at the Brookhaven National Laboratory,USA,the sigma (containing a charm quark) lives too briefly to be seen but is inferred from other particles. A neutrino enters unseen at bottom & collides with a proton in the bubble chamber liquid,producing a negative muon (red) & the sigma. The sigma decays to one negative pion (green,left),three positive pions (blue),& an unseen neutral lambda which betrays itself when it decays to a proton (purple) & a negative pion (green,right). The muon & one of the pions knock out atomic electrons which produce the two spiral tracks (yellow) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Brookhaven National Laboratory |
Taille de l’image : | 3233 px × 4371 px |
Model Release : | Non requis |
Property Release : | Non requis |
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