Tuesday, February 27, 2007, 11:00 am — Small Seminar Room, Bldg. 510
A fundamental challenge in nuclear physics is the description of hadrons in terms of the constituents of the underlying theory of strong interactions. The simplest hadronic system is the pion, whose electromagnetic structure is determined by a single form factor (Fpi). The valence structure of the pion is relatively simple so it is used as a 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 separation of the p(e,e'pi^+)n reaction at low -t. Assuming dominance of the pion
exchange process, the value of F_pi can be extracted from the separated longitudinal response function. Over the past several years, we have completed two experiments at Jefferson Lab (JLab) to measure F_pi over the range of
Q2=0.6 to 2.45 GeV^2. These measurements are planned to be extended to higher Q2 with the completion of the JLab 12 GeV upgrade. These data would challenge QCD-inspired calculations in the most rigorous manner.
The recent JLab data will be presented and compared to a variety of model calculations, and the future outlook will be discussed.
Hosted by: Itaru Nakagawa
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