QUINN, HELEN R. / Physics / Researchers

International Center for Scientific Research


Physics / QUINN, HELEN R.



Staff Scientist at the Theoretical Physics Department of the Stanford Linear Accelerator Center, Stanford University, Stanford, U.S.A.
President of non-profit Contemporary Physics Education Project, which produces material on contemporary topics for high school and college use.

Research interests

Permanent staff member of the Stanford Linear Accelerator Center since 1979, she has made significant contributions to particle physics theory, for which she has received numerous honors.

Some Important Contributions :

· First paper to discuss how the strong, weak, and electromagnetic coupling constants can merge to a single coupling constant in a grand unified theory, with Howard Georgi and Steven Weinberg.

· Suggested a possible near symmetry of the universe (now known as Peccei- Quinn symmetry) to explain how strong interactions can maintain the symmetry between particles and antiparticles (CP symmetry) when weak interactions do not, with Roberto Peccei.

· Showed how physics of quarks can be used to predict some properties of the physics of hadrons (which are particles made from quarks),with Enrico Poggio and Steven Weinberg. This is now known as quark-hadron duality.

· Phenomenological analyses of CP violation in B meson decays in the standard model with the Kobayashi-Maskawa mass matrix.

Prizes and awards

Fellow, American Physical Society
Fellow, Alfred Sloan Foundation 1974-78
Fellow, American Academy of Arts and Sciences

2000 Dirac Medal with Howard Georgi and Jogesh Pati "for pioneering contributions to the quest for a unified theory of quarks and leptons and of the strong, weak, and electromagnetic interactions".


"Divergence Cancellations in a Simplified Weak Interaction Model," Physics Letters 39B: 229 (1972), with T. Appelquist.

"Hierarchy of Interactions in Unified Gauge Theories," Physical Review Letters 33: 451 (1974), with H. Georgi and S. Weinberg.

"Smearing Method in the Quark Model," Physical Review D13: 1958 (1976), with E. C. Poggio and S. Weinberg.

"CP Conservation in the Presence of Pseudoparticles," Physical Review Letters 38: 1440 (1977), with R. D. Peccei.
"Constraints Imposed by CP Conservation in the Presence of a Pseudoparticle," Physical Review D16: 1791 (1977), with R. D. Peccei.

"CP Violation in B Physics," Annual Review of Nuclear and Particle Science 42: 211 (1992), with Y. Nir.

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