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"Gail Hanson and Roy Schwitters are honored for their separate contributions which together provided the first clear evidence that hadronic final states in e+e? annihilation, which are largely composed of spin 0 and spin 1 particles, originate from the fragmentation of spin 1/2 quarks. Gail Hanson observed hadron jets and determined the jet axis by developing and applying the spheric-ity analysis to the hadrons in e+ e? events. She showed that events become more jet?like with increasing energy, contrary to what one expects from a simple phase space production mechanism. Using the beam polarization, she showed that the observed azimuthal distribution of the jet axis was that expected from the production of spin 1/2 quarks that fragment into hadrons."Background:
Hanson received her Ph.D. from MIT in 1973 and joined the Stanford Linear Accelerator Center as a research associate, eventually becoming a permanent member of the research staff. She left SLAC in 1989 to become a professor of physics at Indiana University. A fellow of both the APS and AAPT, she has served on numerous advisory committees, including the HEPAP Subpanel on High Energy Physics.