Yoichiro Nambu (b. 1921) of USA wins 1/2 of the prize for the discovery of the mechanism of spontaneous broken symmetry in subatomic physics.
Makoto Kobayashi (b.1944) and Toshihide Maskawa (b.1940), both from Japan will get 1/4 of the prize for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature.
Source : Nobelprize.org