Robin - No apparent violation there since the baryon number on both sides of 
the reaction is 0
 p+ + p–    →  γ (gamma ray) + γ (gamma ray) 

IOW when the proton and antiproton come into contact, they annihilate into two 
high-energy photons. 

    [email protected] wrote: 
Perhaps I misunderstand conservation of Baryon number, but isn't proton :
anti-proton annihilation an obvious violation?  

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