How many partons can you crash at once?

[edguy99]

Interesting article on double-parton collisions in Fermilab Today.

https://www.fnal.gov/pub/today/archive/archive_2015/today15-11-12.html

Do triple-parton collisions occur?

 

[Vanadium 50]

In principle, an infinite number.

 

[mfb]

I'm not even sure if that number is well-defined without requiring some minimal momentum transfer. Every time I saw discussions of double parton interactions the processes had some threshold (like J/Psi production, or particles above some minimal pT).