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Horn, T; Aniol, K; Arrington, J; Barrett, B; Beise, E J; Blok, H P; Boeglin, W; Brash, E J; Breuer, H; Chang, C C; Christy, M E; Ent, R; Gaskell, D; Gibson, E; Holt, R J; Huber, G M; Jin, S; Jones, M K; Keppel, C E; Kim, W; King, P M; Kovaltchouk, V; Liu, J; Lolos, G J; Mack, D J; Margaziotis, D J; Markowitz, P; Matsumura, A; Meekins, D; Miyoshi, T; Mkrtchyan, H; Niculescu, I; Okayasu, Y; Pentchev, L; Perdrisat, C; Potterveld, D; Punjabi, V; Reimer, P; Reinhold, J; Roche, J; Roos, P G; Sarty, A; Smith, G R; Tadevosyan, V; Tang, L G; Tvaskis, V; Vidakovic, S; Volmer, J; Vulcan, W; Warren, G; Wood, S A; Xu, C; Zheng, X
Physical review letters, 2006-Nov-10, Volume: 97, Issue: 19Journal Article
The 1H(e,e'pi+)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 (F(pi)) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F(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 Q2 by one sigma, but is still far from its perturbative quantum chromodynamics prediction.
