Electronic display of charmed particle decay in the Mark I detector at the Stanford Linear Accel- erator Center,California. The octagon outlines a cross-section through the detector. An electron & a positron have collided at the centre,annihilat- ing into pure energy which rematerialises as a charmed meson particle,the psi-prime. This lives too briefly to be visible,but it decays to two pions (curving tracks) & a second charmed meson,the J/psi. The J/psi also lives too briefly to be seen,but betrays itself by decaying to a positron & electron (straight tracks). Fittingly,the whole decay pattern forms the Greek character psi | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Stanford Linear Accelerator Center |
Taille de l’image : | 5110 px × 3469 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |