Physics Events: Seminars
| Subject: | Quark-hadron duality in neutron spin structure |
| Speaker: | Patricia Solvignon, Argonne National Lab |
| Date: | Fri. Nov. 14, 2008 |
| Time: | 11 a.m. |
| Place: | CEBAF Center Auditorium |
| Abstract: | In 1970, Bloom and Gilman made the surprising observation that measurement of the nucleon structure function at low energy, where nucleon resonances dominate the reaction, is on average equal to the nucleon structure function in the large energy regime where Bjorken-scaling works. This relation between the non-perturbative and the perturbative descriptions of the nucleon is called quark-hadron duality. In order to have a more complete picture of the mechanism of quark-hadron duality, a study of the phenomenom for the neutron spin structure function was needed. In JLab Hall A experiment E01-012, for the first time, quark-hadron duality has been observed in the neutron and 3He polarized structure functions g1 down to Q2 of at least 1.8 (GeV/c)2. Details of the experiment, along with the recently published data on quark-hadron duality on the neutron and 3He spin structures will be reviewed. Other preliminary data from this experiment will be presented. Upcoming Seminars: Dec 12 Earle Lomon (MIT) Jan 9 Michael Kohl (Hampton) Jan 23 Krishna Kumar (UMass) |
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