Symposium on

The Quark Discovery

50 Years

October 25, 2019 • MIT

About The Symposium

The Quark Discovery

Fifty years have passed since the publication of two articles in Physical Review Letters on October 20, 1969 [ 1, 2 ]. These articles marked the discovery of the quark and led to the 1990 Nobel Prize in Physics for Jerome Friedman, Henry Kendall and Richard Taylor.

The symposium features presentations by theorists and experimentalists that were intimately involved in this exciting breakthrough.

Here is a simple 3 minute introduction to the experiment in 1969 by SLAC National Accelerator Laboratory.


Poster size, letter size.


Date: Friday, October 25, 2019 from 2:00pm to 6:00pm
Location: Wong Auditorium, Tang Center (Building E51)


Session 1 [ ] -- Moderator: Jerome Friedman
2:00pm Peter Fisher, Department Head, Physics [ ]
Welcome to celebrate 50 years of quarks!
2:10pm George Zweig [ , ]
Discovering Concrete Quarks
2:40pm Chris LLewellyn Smith [ , ]
From Concrete Quarks to QCD by Way of SLAC and Bjorken Scaling
3:10pm Martin Breidenbach [ , ]
Deep Inelastic Electron-Proton Scattering and the Evidence for Substructure
3:40pm BREAK for discussion and coffee
Session 2 [ ] -- Moderator: David Coward
4:00pm Arie Bodek [ , ]
Evidence for Fractional Charge of Partons
4:30pm Michael Riordan [ , ]
Structure Function Separations and the Determination of Parton Spin
5:00pm Robert Jaffe [ , ]
"Nature reads books on free field theory": From Deep Inelastic Scattering to the Bag Model


Organizing Committee

Arie Bodek

Arie Bodek

Martin Breidenbach (co-chair)

Martin Breidenbach

Jerome Friedman

Jerome Friedman

Christoph Paus (co-chair)

Christoph Paus

Michael Riordan

Michael Riordan


October 25, 2019
2:00pm to 6:00pm