11. However a contains one up, one strange, and one bottom quark, while a contains one up and two bottom quarks . 12. However a contains one up, one strange, and one bottom quark , while a contains one up and two bottom quarks. 13. The heavier scalar mesons containing charm and / or bottom quarks all occur well over 2 GeV / c 2. 14. Each B meson has an antiparticle that is composed of a bottom quark and an charm antiquark ( ) respectively. 15. So, since the strange and bottom quarks have a negative charge, they have flavor quantum numbers equal to " 1. 16. This allows us to measure, for example, bottom quarks which decay into a relatively long-lived B-meson through " topological " cuts. 17. Bottom quarks have ( by convention ) a bottomness of & minus; 1 while bottom antiquarks have a bottomness of + 1.18. It was first observed by the BaBar experiment at SLAC in 2008, and is the lightest particle containing a bottom and anti-bottom quark . 19. By the time it can interact strongly it has already decayed to another flavour of quark ( usually to a bottom quark ). 20. And while other producers have been busy taking meetings, Lederman has been discovering the muon neutrino, the neutral K-meson and the bottom quark .
