Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
The Jefferson Lab Fπ-2 Collaboration
T. Horn et al. "Determination of the Pion Charge Form Factor at Q2=1.60 and 2.45 (GeV/c)2." Physical Review Letters 97, no. 19 (2006): 192001.
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The 1H(e,e′π+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W =2.22 GeV. The charged pion form factor (Fπ) was extracted from the data by comparing the separated longitudinal pion electropro- duction cross section to a Regge model prediction in which Fπ is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q2 by one sigma, but is still far from its perturbative Quantum Chromo-Dynamics prediction.