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High School
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| TEACHING MATERIALS LINKS&BOOKS VISITING CERN HST | ![]() |
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| © CERN and High School Teachers Programme at CERN |
Last modified: 25 July 2001 |
The event we described is

By looking at the table you see the process is permitted because the quantum numbers are all conserved.
| Property/Particle | K- | p | -> | p | p- | K0 |
| Q | -1 | +1 | = | +1 | -1 | 0 |
| B | 0 | +1 | = | +1 | 0 | 0 |
| S | -1 | 0 | = | 0 | 0 | -1 |
The process
K-p --> pp-L0
is forbidden because one of the quantum numbers is not conserved.
Which one?
| S |