Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors
Journal
Physical Review C - Nuclear Physics
Date Issued
2013-04-15
Author(s)
Khetarpal, P.
Stoler, P.
Aznauryan, I. G.
Kubarovsky, V.
Adhikari, K. P.
Adikaram, D.
Aghasyan, M.
Amaryan, M. J.
Anderson, M. D.
Anefalos Pereira, S.
Anghinolfi, M.
Avakian, H.
Baghdasaryan, H.
Ball, J.
Baltzell, N. A.
Battaglieri, M.
Batourine, V.
Bedlinskiy, I.
Biselli, A. S.
Bono, J.
Boiarinov, S.
Briscoe, W. J.
Carman, D. S.
Celentano, A.
Charles, G.
Cole, P. L.
Contalbrigo, M.
Crede, V.
D'Angelo, A.
Dashyan, N.
De Vita, R.
De Sanctis, E.
Deur, A.
Djalali, C.
Doughty, D.
Dugger, M.
Dupre, R.
Egiyan, H.
El Alaoui, A.
El Fassi, L.
Eugenio, P.
Fedotov, G.
Fegan, S.
Fersch, R.
Fleming, J. A.
Fradi, A.
Gabrielyan, M. Y.
Garçon, M.
Gevorgyan, N.
Gilfoyle, G. P.
Giovanetti, K. L.
Girod, F. X.
Goetz, J. T.
Gohn, W.
Golovatch, E.
Gothe, R. W.
Griffioen, K. A.
Guegan, B.
Guidal, M.
Guo, L.
Hafidi, K.
Hanretty, C.
Harrison, N.
Hicks, K.
Ho, D.
Holtrop, M.
Hyde, C. E.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jo, H. S.
Joo, K.
Keller, D.
Khandaker, M.
Kim, A.
Kim, W.
Klein, F. J.
Koirala, S.
Kubarovsky, A.
Kvaltine, N. D.
Lewis, S.
Livingston, K.
Lu, H. Y.
Macgregor, I. J.D.
Mao, Y.
Martinez, D.
Mayer, M.
McKinnon, B.
Meyer, C. A.
Mineeva, T.
Mirazita, M.
Mokeev, V.
Montgomery, R. A.
Moutarde, H.
Munevar, E.
DOI
10.1103/PhysRevC.87.045205
Abstract
We report the measurement of near-threshold neutral pion electroproduction cross sections and the extraction
of the associated structure functions on the proton in the kinematic range Q2 from 2 to 4.5 GeV2 and W from
1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles E0+ and
S0+ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to
the generalized form factors Gπ0p
1 (Q2) and Gπ0p
2 (Q2). The data are compared to these generalized form factors
and the results for Gπ0p
1 (Q2) are found to be in good agreement with the LCSR predictions, but the level of
agreement with Gπ0p
2 (Q2) is poor.
of the associated structure functions on the proton in the kinematic range Q2 from 2 to 4.5 GeV2 and W from
1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles E0+ and
S0+ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to
the generalized form factors Gπ0p
1 (Q2) and Gπ0p
2 (Q2). The data are compared to these generalized form factors
and the results for Gπ0p
1 (Q2) are found to be in good agreement with the LCSR predictions, but the level of
agreement with Gπ0p
2 (Q2) is poor.
Subjects
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