Determination of the Pion Charge Form Factor at Q2=1.60 and 2.45  (GeV/c)2

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2006-11-10

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Horn, T. et al. "Determination of the Pion Charge Form Factor at Q2=1.60 and 2.45  (GeV/c)2." Physical Review Letters 95, no. 19 (2006): 192001 (4).

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Abstract

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 electroproduction 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 chromodynamics prediction.

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