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

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.; The Jefferson Lab Fπ-2 Collaboration

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Date

2006-11

Author

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.

The Jefferson Lab Fπ-2 Collaboration

Citation

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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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 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.