The Nobel Prize in Physics 2015 was awarded jointly to Takaaki Kajita and Arthur B. McDonald

The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2015 to

Takaaki Kajita
Super-Kamiokande Collaboration
University of Tokyo, Kashiwa, Japan

and

Arthur B. McDonald
Sudbury Neutrino Observatory Collaboration
Queen’s University, Kingston, Canada

“for the discovery of neutrino oscillations, which shows that neutrinos have mass”

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Reference: http://www.nobelprize.org/nobel_prizes/physics/laureates/2015/press.html