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    The piNN Form Factor piNN(t)

    Session OB11 - Minisymposium on the Structure of the Nucleon II.
    ORAL session, Wednesday morning, March 24
    Room 218E, GWCC

    Liming Qin (Old Dominion University Norfolk, Virginia)

    for the Charged Pion Form Factor (F_\pi) Collaboration at the Thomas Jefferson National Accelerator Facility (E93021).

    The \piNN form factor g_\piNN(t) is important for an understanding of the structure of the nucleon and the pion.

    Recent theoretical models are in favor of a soft g_\piNN(t) form factor with a cut off mass \Lambda_\pi as low as 0.5 GeV in a monopole representation. This is compared to a value of 1.3 GeV obtained from the study of one boson exchange potential for the NN interaction.

    We studied the pion electroproduction off proton target at four Q^2 settings and separated the longitudinal and transverse cross sections.

    We used the longitudinal cross sections at the two low Q^2 settings, 0.6 and 0.75 (GeV/c)^2, to determine the piNN form factor piNN(t), assuming the dominance of the t-channel one pion exchange. We will present preliminary results and compare with theoretical predictions.

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