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Nuclear Physics Seminars

ics Nuclear
Tuesday, September 25, 2007
3:30 PM
Physics Building, Room 204
Tanja Horn [Host: Donal Day]
JLAB
"The pion form factor"
ABSTRACT:
The pion charge form factor, F π , is the fundamental interest in the study of the quark-gluon structure of hadrons. The relatively simple < qq > valence structure makes the pion an ideal test case for all models of hadronic structure. Experimentally, the measurement of the pion form factor poses special challenges. The technique utilizes a precision Rosenbluth seperation of the p(e,e' π + )n reaction at low -t. F π is then extracted from the separated σ L cross sections with the aid of a model. Over the past several years, we have carried out two experiments at Jefferson Lab (JLab) to measure F π over a kinematic range of Q 2 = 0.6-2.45 GeV 2 . These measurements are planned to be extended to higher Q 2 with the completion of the JLab 12 GeV upgrade. These data would challenge QCD based calculations in the most rigorous manner. The recent JLab results will be presented and compared to a variety of model calculations, and the future outlook will be discussed.

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