Torbjörn Sjöstrand

Torbjörn Sjöstrand (born 13 November 1954) is a Swedish theoretical physicist and a professor at Lund University in Sweden, where he also got his PhD in 1982. He is one of the main authors of PYTHIA, a program for generation of high-energy physics events. In 2012, he was awarded the Sakurai Prize by the American Physical Society.

In 2012, he was awarded the J. J. Sakurai Prize for Theoretical Particle Physics by the American Physical Society. The citation reads:

For key ideas leading to the detailed confirmation of the Standard Model of particle physics, enabling high energy experiments to extract precise information about Quantum Chromodynamics, electroweak interactions and possible new physics.