Who shared in Yoichiro Nambu's 2008 Nobel Prize for Chiral symetry breaking?
Chiral symmetry breaking:  Yoichiro Nambu was awarded the 2008 Nobel prize in physics for describing this phenomenon ("for the discovery of the mechanism of spontaneous broken symmetry in subatomic physics"). Yoichiro Nambu:  The other half was split equally between Makoto Kobayashi and Toshihide Maskawa "for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature."
Makoto Kobayashi and Toshihide Maskawa