Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors

P. Khetarpal, P. Stoler, I. G. Aznauryan, V. Kubarovsky, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. J. Amaryan, M. D. Anderson, S. Anefalos Pereira, M. Anghinolfi, H. Avakian, H. Baghdasaryan, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, A. S. Biselli, J. Bono & 140 others S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, G. Charles, P. L. Cole, M. Contalbrigo, V. Crede, A. D'Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, D. Doughty, Michael Dugger, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, R. Fersch, J. A. Fleming, A. Fradi, M. Y. Gabrielyan, M. Garçon, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, B. Guegan, M. Guidal, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, N. Harrison, K. Hicks, D. Ho, M. Holtrop, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. S. Jo, K. Joo, D. Keller, M. Khandaker, A. Kim, W. Kim, F. J. Klein, S. Koirala, A. Kubarovsky, S. V. Kuleshov, N. D. Kvaltine, S. Lewis, K. Livingston, H. Y. Lu, I. J.D. Macgregor, Y. Mao, D. Martinez, M. Mayer, B. McKinnon, C. A. Meyer, T. Mineeva, M. Mirazita, V. Mokeev, R. A. Montgomery, H. Moutarde, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, L. L. Pappalardo, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, E. Phelps, J. J. Phillips, S. Pisano, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, A. J.R. Puckett, B. A. Raue, G. Ricco, D. Rimal, M. Ripani, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, N. A. Saylor, D. Schott, R. A. Schumacher, E. Seder, H. Seraydaryan, Y. G. Sharabian, G. D. Smith, D. I. Sober, D. Sokhan, S. S. Stepanyan, S. Stepanyan, I. I. Strakovsky, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, S. Tkachenko, M. Ungaro, B. Vernarsky, H. Voskanyan, E. Voutier, N. K. Walford, L. B. Weinstein, D. P. Weygand, M. H. Wood, N. Zachariou, J. Zhang, Z. W. Zhao, I. Zonta

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 G1π0p(Q2) and G2π0p(Q2). The data are compared to these generalized form factors and the results for G1π0p(Q2) are found to be in good agreement with the LCSR predictions, but the level of agreement with G2π0p(Q2) is poor.

Original languageEnglish (US)
Article number045205
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number4
DOIs
StatePublished - Apr 15 2013

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multipoles
sum rules
momentum transfer
form factors
cones
pions
thresholds
kinematics
protons
cross sections
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Khetarpal, P., Stoler, P., Aznauryan, I. G., Kubarovsky, V., Adhikari, K. P., Adikaram, D., ... Zonta, I. (2013). Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors. Physical Review C - Nuclear Physics, 87(4), [045205]. https://doi.org/10.1103/PhysRevC.87.045205

Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors. / 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.; Brooks, W. K.; Burkert, V. D.; 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, Michael; 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.; Hakobyan, H.; 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.; Kuleshov, S. V.; 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.; Munoz Camacho, C.; Nadel-Turonski, P.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Park, S.; Pasyuk, E.; Phelps, E.; Phillips, J. J.; Pisano, S.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Protopopescu, D.; Puckett, A. J.R.; Raue, B. A.; Ricco, G.; Rimal, D.; Ripani, M.; Rosner, G.; Rossi, P.; Sabatié, F.; Saini, M. S.; Salgado, C.; Saylor, N. A.; Schott, D.; Schumacher, R. A.; Seder, E.; Seraydaryan, H.; Sharabian, Y. G.; Smith, G. D.; Sober, D. I.; Sokhan, D.; Stepanyan, S. S.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tang, W.; Taylor, C. E.; Tkachenko, S.; Ungaro, M.; Vernarsky, B.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Weinstein, L. B.; Weygand, D. P.; Wood, M. H.; Zachariou, N.; Zhang, J.; Zhao, Z. W.; Zonta, I.

In: Physical Review C - Nuclear Physics, Vol. 87, No. 4, 045205, 15.04.2013.

Research output: Contribution to journalArticle

Khetarpal, P, Stoler, P, Aznauryan, IG, Kubarovsky, V, Adhikari, KP, Adikaram, D, Aghasyan, M, Amaryan, MJ, Anderson, MD, Anefalos Pereira, S, Anghinolfi, M, Avakian, H, Baghdasaryan, H, Ball, J, Baltzell, NA, Battaglieri, M, Batourine, V, Bedlinskiy, I, Biselli, AS, Bono, J, Boiarinov, S, Briscoe, WJ, Brooks, WK, Burkert, VD, Carman, DS, Celentano, A, Charles, G, Cole, PL, 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, JA, Fradi, A, Gabrielyan, MY, Garçon, M, Gevorgyan, N, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gohn, W, Golovatch, E, Gothe, RW, Griffioen, KA, Guegan, B, Guidal, M, Guo, L, Hafidi, K, Hakobyan, H, Hanretty, C, Harrison, N, Hicks, K, Ho, D, Holtrop, M, Hyde, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Jo, HS, Joo, K, Keller, D, Khandaker, M, Kim, A, Kim, W, Klein, FJ, Koirala, S, Kubarovsky, A, Kuleshov, SV, Kvaltine, ND, Lewis, S, Livingston, K, Lu, HY, Macgregor, IJD, Mao, Y, Martinez, D, Mayer, M, McKinnon, B, Meyer, CA, Mineeva, T, Mirazita, M, Mokeev, V, Montgomery, RA, Moutarde, H, Munevar, E, Munoz Camacho, C, Nadel-Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Osipenko, M, Ostrovidov, AI, Pappalardo, LL, Paremuzyan, R, Park, K, Park, S, Pasyuk, E, Phelps, E, Phillips, JJ, Pisano, S, Pogorelko, O, Pozdniakov, S, Price, JW, Procureur, S, Protopopescu, D, Puckett, AJR, Raue, BA, Ricco, G, Rimal, D, Ripani, M, Rosner, G, Rossi, P, Sabatié, F, Saini, MS, Salgado, C, Saylor, NA, Schott, D, Schumacher, RA, Seder, E, Seraydaryan, H, Sharabian, YG, Smith, GD, Sober, DI, Sokhan, D, Stepanyan, SS, Stepanyan, S, Strakovsky, II, Strauch, S, Taiuti, M, Tang, W, Taylor, CE, Tkachenko, S, Ungaro, M, Vernarsky, B, Voskanyan, H, Voutier, E, Walford, NK, Weinstein, LB, Weygand, DP, Wood, MH, Zachariou, N, Zhang, J, Zhao, ZW & Zonta, I 2013, 'Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors', Physical Review C - Nuclear Physics, vol. 87, no. 4, 045205. https://doi.org/10.1103/PhysRevC.87.045205
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. ; Brooks, W. K. ; Burkert, V. D. ; 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, Michael ; 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. ; Hakobyan, H. ; 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. ; Kuleshov, S. V. ; 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. ; Munoz Camacho, C. ; Nadel-Turonski, P. ; Nasseripour, R. ; Niccolai, S. ; Niculescu, G. ; Niculescu, I. ; Osipenko, M. ; Ostrovidov, A. I. ; Pappalardo, L. L. ; Paremuzyan, R. ; Park, K. ; Park, S. ; Pasyuk, E. ; Phelps, E. ; Phillips, J. J. ; Pisano, S. ; Pogorelko, O. ; Pozdniakov, S. ; Price, J. W. ; Procureur, S. ; Protopopescu, D. ; Puckett, A. J.R. ; Raue, B. A. ; Ricco, G. ; Rimal, D. ; Ripani, M. ; Rosner, G. ; Rossi, P. ; Sabatié, F. ; Saini, M. S. ; Salgado, C. ; Saylor, N. A. ; Schott, D. ; Schumacher, R. A. ; Seder, E. ; Seraydaryan, H. ; Sharabian, Y. G. ; Smith, G. D. ; Sober, D. I. ; Sokhan, D. ; Stepanyan, S. S. ; Stepanyan, S. ; Strakovsky, I. I. ; Strauch, S. ; Taiuti, M. ; Tang, W. ; Taylor, C. E. ; Tkachenko, S. ; Ungaro, M. ; Vernarsky, B. ; Voskanyan, H. ; Voutier, E. ; Walford, N. K. ; Weinstein, L. B. ; Weygand, D. P. ; Wood, M. H. ; Zachariou, N. ; Zhang, J. ; Zhao, Z. W. ; Zonta, I. / Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors. In: Physical Review C - Nuclear Physics. 2013 ; Vol. 87, No. 4.
@article{df3192ec8a2d4f4799323a0c08b8ea73,
title = "Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors",
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 G1π0p(Q2) and G2π0p(Q2). The data are compared to these generalized form factors and the results for G1π0p(Q2) are found to be in good agreement with the LCSR predictions, but the level of agreement with G2π0p(Q2) is poor.",
author = "P. Khetarpal and P. Stoler and Aznauryan, {I. G.} and V. Kubarovsky and Adhikari, {K. P.} and D. Adikaram and M. Aghasyan and Amaryan, {M. J.} and Anderson, {M. D.} and {Anefalos Pereira}, S. and M. Anghinolfi and H. Avakian and H. Baghdasaryan and J. Ball and Baltzell, {N. A.} and M. Battaglieri and V. Batourine and I. Bedlinskiy and Biselli, {A. S.} and J. Bono and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and Burkert, {V. D.} and Carman, {D. S.} and A. Celentano and G. Charles and Cole, {P. L.} and M. Contalbrigo and V. Crede and A. D'Angelo and N. Dashyan and {De Vita}, R. and {De Sanctis}, E. and A. Deur and C. Djalali and D. Doughty and Michael Dugger and R. Dupre and H. Egiyan and {El Alaoui}, A. and {El Fassi}, L. and P. Eugenio and G. Fedotov and S. Fegan and R. Fersch and Fleming, {J. A.} and A. Fradi and Gabrielyan, {M. Y.} and M. Gar{\cc}on and N. Gevorgyan and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and W. Gohn and E. Golovatch and Gothe, {R. W.} and Griffioen, {K. A.} and B. Guegan and M. Guidal and L. Guo and K. Hafidi and H. Hakobyan and C. Hanretty and N. Harrison and K. Hicks and D. Ho and M. Holtrop and Hyde, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ishkhanov, {B. S.} and Isupov, {E. L.} and Jo, {H. S.} and K. Joo and D. Keller and M. Khandaker and A. Kim and W. Kim and Klein, {F. J.} and S. Koirala and A. Kubarovsky and Kuleshov, {S. V.} and Kvaltine, {N. D.} and S. Lewis and K. Livingston and Lu, {H. Y.} and Macgregor, {I. J.D.} and Y. Mao and D. Martinez and M. Mayer and B. McKinnon and Meyer, {C. A.} and T. Mineeva and M. Mirazita and V. Mokeev and Montgomery, {R. A.} and H. Moutarde and E. Munevar and {Munoz Camacho}, C. and P. Nadel-Turonski and R. Nasseripour and S. Niccolai and G. Niculescu and I. Niculescu and M. Osipenko and Ostrovidov, {A. I.} and Pappalardo, {L. L.} and R. Paremuzyan and K. Park and S. Park and E. Pasyuk and E. Phelps and Phillips, {J. J.} and S. Pisano and O. Pogorelko and S. Pozdniakov and Price, {J. W.} and S. Procureur and D. Protopopescu and Puckett, {A. J.R.} and Raue, {B. A.} and G. Ricco and D. Rimal and M. Ripani and G. Rosner and P. Rossi and F. Sabati{\'e} and Saini, {M. S.} and C. Salgado and Saylor, {N. A.} and D. Schott and Schumacher, {R. A.} and E. Seder and H. Seraydaryan and Sharabian, {Y. G.} and Smith, {G. D.} and Sober, {D. I.} and D. Sokhan and Stepanyan, {S. S.} and S. Stepanyan and Strakovsky, {I. I.} and S. Strauch and M. Taiuti and W. Tang and Taylor, {C. E.} and S. Tkachenko and M. Ungaro and B. Vernarsky and H. Voskanyan and E. Voutier and Walford, {N. K.} and Weinstein, {L. B.} and Weygand, {D. P.} and Wood, {M. H.} and N. Zachariou and J. Zhang and Zhao, {Z. W.} and I. Zonta",
year = "2013",
month = "4",
day = "15",
doi = "10.1103/PhysRevC.87.045205",
language = "English (US)",
volume = "87",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "4",

}

TY - JOUR

T1 - Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors

AU - Khetarpal, P.

AU - Stoler, P.

AU - Aznauryan, I. G.

AU - Kubarovsky, V.

AU - Adhikari, K. P.

AU - Adikaram, D.

AU - Aghasyan, M.

AU - Amaryan, M. J.

AU - Anderson, M. D.

AU - Anefalos Pereira, S.

AU - Anghinolfi, M.

AU - Avakian, H.

AU - Baghdasaryan, H.

AU - Ball, J.

AU - Baltzell, N. A.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Bedlinskiy, I.

AU - Biselli, A. S.

AU - Bono, J.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Charles, G.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - De Sanctis, E.

AU - Deur, A.

AU - Djalali, C.

AU - Doughty, D.

AU - Dugger, Michael

AU - Dupre, R.

AU - Egiyan, H.

AU - El Alaoui, A.

AU - El Fassi, L.

AU - Eugenio, P.

AU - Fedotov, G.

AU - Fegan, S.

AU - Fersch, R.

AU - Fleming, J. A.

AU - Fradi, A.

AU - Gabrielyan, M. Y.

AU - Garçon, M.

AU - Gevorgyan, N.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girod, F. X.

AU - Goetz, J. T.

AU - Gohn, W.

AU - Golovatch, E.

AU - Gothe, R. W.

AU - Griffioen, K. A.

AU - Guegan, B.

AU - Guidal, M.

AU - Guo, L.

AU - Hafidi, K.

AU - Hakobyan, H.

AU - Hanretty, C.

AU - Harrison, N.

AU - Hicks, K.

AU - Ho, D.

AU - Holtrop, M.

AU - Hyde, C. E.

AU - Ilieva, Y.

AU - Ireland, D. G.

AU - Ishkhanov, B. S.

AU - Isupov, E. L.

AU - Jo, H. S.

AU - Joo, K.

AU - Keller, D.

AU - Khandaker, M.

AU - Kim, A.

AU - Kim, W.

AU - Klein, F. J.

AU - Koirala, S.

AU - Kubarovsky, A.

AU - Kuleshov, S. V.

AU - Kvaltine, N. D.

AU - Lewis, S.

AU - Livingston, K.

AU - Lu, H. Y.

AU - Macgregor, I. J.D.

AU - Mao, Y.

AU - Martinez, D.

AU - Mayer, M.

AU - McKinnon, B.

AU - Meyer, C. A.

AU - Mineeva, T.

AU - Mirazita, M.

AU - Mokeev, V.

AU - Montgomery, R. A.

AU - Moutarde, H.

AU - Munevar, E.

AU - Munoz Camacho, C.

AU - Nadel-Turonski, P.

AU - Nasseripour, R.

AU - Niccolai, S.

AU - Niculescu, G.

AU - Niculescu, I.

AU - Osipenko, M.

AU - Ostrovidov, A. I.

AU - Pappalardo, L. L.

AU - Paremuzyan, R.

AU - Park, K.

AU - Park, S.

AU - Pasyuk, E.

AU - Phelps, E.

AU - Phillips, J. J.

AU - Pisano, S.

AU - Pogorelko, O.

AU - Pozdniakov, S.

AU - Price, J. W.

AU - Procureur, S.

AU - Protopopescu, D.

AU - Puckett, A. J.R.

AU - Raue, B. A.

AU - Ricco, G.

AU - Rimal, D.

AU - Ripani, M.

AU - Rosner, G.

AU - Rossi, P.

AU - Sabatié, F.

AU - Saini, M. S.

AU - Salgado, C.

AU - Saylor, N. A.

AU - Schott, D.

AU - Schumacher, R. A.

AU - Seder, E.

AU - Seraydaryan, H.

AU - Sharabian, Y. G.

AU - Smith, G. D.

AU - Sober, D. I.

AU - Sokhan, D.

AU - Stepanyan, S. S.

AU - Stepanyan, S.

AU - Strakovsky, I. I.

AU - Strauch, S.

AU - Taiuti, M.

AU - Tang, W.

AU - Taylor, C. E.

AU - Tkachenko, S.

AU - Ungaro, M.

AU - Vernarsky, B.

AU - Voskanyan, H.

AU - Voutier, E.

AU - Walford, N. K.

AU - Weinstein, L. B.

AU - Weygand, D. P.

AU - Wood, M. H.

AU - Zachariou, N.

AU - Zhang, J.

AU - Zhao, Z. W.

AU - Zonta, I.

PY - 2013/4/15

Y1 - 2013/4/15

N2 - 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 G1π0p(Q2) and G2π0p(Q2). The data are compared to these generalized form factors and the results for G1π0p(Q2) are found to be in good agreement with the LCSR predictions, but the level of agreement with G2π0p(Q2) is poor.

AB - 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 G1π0p(Q2) and G2π0p(Q2). The data are compared to these generalized form factors and the results for G1π0p(Q2) are found to be in good agreement with the LCSR predictions, but the level of agreement with G2π0p(Q2) is poor.

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U2 - 10.1103/PhysRevC.87.045205

DO - 10.1103/PhysRevC.87.045205

M3 - Article

VL - 87

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 4

M1 - 045205

ER -