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Q & A: Why does our universe have more baryons than mesons?

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Most recent answer: 08/19/2016
Q:
Why does our universe have more baryons than mesons?
- Siva Sankaran (age 19)
TN, India
A:

The only stable elementary particles are protons, electrons, neutrinos and photons.   All other baryons and mesons will eventually decay into a combination of these three.   For example a neutron will decay into a proton, electron, and neutrino.  A pi-meson will decay into a muon or electron plus the appropriate neutrino. 

LeeH


(published on 08/19/2016)

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