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Horn, T.; Beise, E. J.; Breuer, H.; Chang, C. C.; King, P. M.; Liu, J.; Roos, P. G.; Aniol, K.; Margaziotis, D. J.; Arrington, J.; Holt, R. J.; Potterveld, D.; Reimer, P.; Zheng, X.; Barrett, B.; Sarty, A.; Blok, H. P.; Tvaskis, V.; NIKHEF, Postbus 41882, NL-1009 DB Amsterdam; Boeglin, W.; Markowitz, P.
Physical review letters, 11/2006, Volume: 97, Issue: 19Journal Article
The {sup 1}H(e,e{sup '}{pi}{sup +})n cross section was measured at four-momentum transfers of Q{sup 2}=1.60 and 2.45 GeV{sup 2} at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F{sub {pi}}) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F{sub {pi}} is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q{sup 2} by one sigma, but is still far from its perturbative quantum chromodynamics prediction.
