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 his early career, Sjöstrand spent shorter postdoc periods at DESY (Germany) and Fermilab (USA). From 1989 to 1995 he was staff member in the CERN Theory division.

Honours
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."

In 2021, he was awarded the High Energy and Particle Physics Prize of the European Physical Society for the development of PYTHIA. He received the award together with Bryan Webber, who was also a co-recipient of the Sakurai Prize.