Zumino, a physicist who proposed a theory called supersymmetry that
promised to help tie together the fundamental laws of the universe but
that has yet to be borne out in experiments, died June 21 at his home in
Berkeley, Calif. He was 91.
His death was confirmed by the University of California, Berkeley, where he was an emeritus professor.
Dr. Zumino developed supersymmetry with Julius Wess, a colleague at the CERN
particle physics laboratory in Switzerland. It predicted the discovery
of elementary particles that have yet to be observed in particle
collision experiments at the Large Hadron Collider at CERN.