Production & decay of mesons in the ALEPH detector at CERN. The computer display is a close-up of the event in picture A142/448. An electron & positron,accelerated in CERN's LEP collider,annihilate to produce a B meson consisting of a bottom quark bound with a strange antiquark. The B meson (fine dotted track) decays to a D meson when the bottom quark turns into a lighter charm quark,emitting an electron (green) & unseen neutrino. The D meson (second dotted track) decays when its charm quark turns into a lighter strange quark which,with the original strange antiquark,form 2 kaons (blue). The D also creates an up quark & down antiquark that make a pion (yellow).Other particles are red | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Cern |
Taille de l’image : | 3280 px × 1039 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|