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**Howard Georgi**, Harvard University, Cambridge,
USA,

**Jogesh Pati**, University of Maryland, and
Stanford Linear Accelerator Centre, USA

**Helen Quinn**, Stanford Linear Accelerator
Center, Menlo Park, USA

The 2000 Dirac Medal is awarded to Howard Georgi, Jogesh Pati and Helen Quinn for pioneering contributions to the quest for a unified theory of quarks and leptons and of the strong, weak, and electromagnetic interactions.

The award to Pati notably recognizes his formulation (with Salam) of the original gauge theory with quark-lepton unification, and their resulting insight that baryon number violation is a likely consequence of such unification. Much of this work was done at the ICTP in the early 1970's. The award to Georgi recognizes his discovery of many of the most significant models of grand unification, including the SU(5) model (with Glashow) and the SO(10) model, as well as his role in the Georgi-Quinn-Weinberg computation showing that the natural mass scale of unification is relatively close to the Planck scale, and that the proton lifetime can naturally be extremely long. Finally, the award to Quinn recognizes the Georgi-Quinn-Weinberg computation, as well as her fundamental insights (with Peccei) about CP conservation by strong interactions.

**Jogesh Pati:** Video [Announcement of Award on Local
News] [INTRANET ONLY]

**Helen Quinn**

Press articles [INTRANET ONLY]

ICTP - Strada Costiera, 11

I - 34151 Trieste Italy

I - 34151 Trieste Italy

ICTP is governed by UNESCO, IAEA, and Italy, and it is a UNESCO Category 1 Institute

ICTP is governed by UNESCO, IAEA, and Italy, and it is a UNESCO Category 1 Institute