Abstract
The ep → e ′ pρ0 reaction has been measured using the 5.754GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W , Q2 and t dependences of the cross-section are compared to theoretical calculations based on the t -channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the ≈ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 5-31 |
| Number of pages | 27 |
| Journal | European Physical Journal A |
| Volume | 39 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2009 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Exclusive ρ0 electroproduction on the proton at CLAS. / Morrow, S. A.; Guidal, M.; Garçon, M.; Laget, J. M.; Smith, E. S.; Adams, G.; Adhikari, K. P.; Aghasyan, M.; Amaryan, M. J.; Anghinolfi, M.; Asryan, G.; Audit, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J. P.; Baltzell, N. A.; Barrow, S.; Battaglieri, M.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Berman, B. L.; Biselli, A. S.; Blaszczyk, L.; Bonner, B. E.; Bookwalter, C.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Burkert, V. D.; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Carnahan, B.; Casey, L.; Cazes, A.; Chen, S.; Cheng, L.; Cole, P. L.; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Crede, V.; Cummings, J. P.; Dale, D.; Dashyan, N.; De Masi, R.; De Vita, R.; De Sanctis, E.; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Dhamija, S.; Dharmawardane, K. V.; Dhuga, K. S.; Dickson, R.; Didelez, J. P.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dugger, Michael; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; El Fassi, L.; Elouadrhiri, L.; Eugenio, P.; Fatemi, R.; Fedotov, G.; Fersch, R.; Feuerbach, R. J.; Forest, T. A.; Fradi, A.; Gavalian, G.; Gevorgyan, N.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gohn, W.; Gordon, C. I O; Gothe, R. W.; Graham, L.; Griffioen, K. A.; Guillo, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Hardie, J.; Hassall, N.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hourany, E.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Ito, M. M.; Jenkins, D.; Jo, H. S.; Johnstone, J. R.; Joo, K.; Juengst, H. G.; Kalantarians, N.; Keller, D.; Kellie, J. D.; Khandaker, M.; Khetarpal, P.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A. V.; Kossov, M.; Kramer, L. H.; Kubarovsky, V.; Kuhn, J.; Kuhn, S. E.; Kuleshov, S. V.; Kuznetsov, V.; Lachniet, J.; Langheinrich, J.; Lawrence, D.; Li, Ji; Livingston, K.; Lu, H. Y.; MacCormick, M.; Marchand, C.; Markov, N.; Mattione, P.; McAleer, S.; McCracken, M.; McKinnon, B.; McNabb, J. W C; Mecking, B. A.; Mehrabyan, S.; Melone, J. J.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Morand, L.; Moreno, B.; Moriya, K.; Moteabbed, M.; Mueller, J.; Munevar, E.; Mutchler, G. S.; Nadel-Turonski, P.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; O'Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Park, S.; Pasyuk, E.; Paterson, C.; Anefalos Pereira, S.; Philips, S. A.; Pierce, J.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Popa, I.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Procureur, S.; Prok, Y.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Rosner, G.; Rossi, P.; Rubin, P. D.; Sabatié, F.; Saini, M. S.; Salamanca, J.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schott, D.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Sharov, D.; Shvedunov, N. V.; Skabelin, A. V.; Smith, L. C.; Sober, D. I.; Sokhan, D.; Stavinsky, A.; Stepanyan, S. S.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tedeschi, D. J.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Watts, D. P.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yurov, M.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z. W.
In: European Physical Journal A, Vol. 39, No. 1, 01.2009, p. 5-31.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Exclusive ρ0 electroproduction on the proton at CLAS
AU - Morrow, S. A.
AU - Guidal, M.
AU - Garçon, M.
AU - Laget, J. M.
AU - Smith, E. S.
AU - Adams, G.
AU - Adhikari, K. P.
AU - Aghasyan, M.
AU - Amaryan, M. J.
AU - Anghinolfi, M.
AU - Asryan, G.
AU - Audit, G.
AU - Avakian, H.
AU - Bagdasaryan, H.
AU - Baillie, N.
AU - Ball, J. P.
AU - Baltzell, N. A.
AU - Barrow, S.
AU - Battaglieri, M.
AU - Bedlinskiy, I.
AU - Bektasoglu, M.
AU - Bellis, M.
AU - Benmouna, N.
AU - Berman, B. L.
AU - Biselli, A. S.
AU - Blaszczyk, L.
AU - Bonner, B. E.
AU - Bookwalter, C.
AU - Bouchigny, S.
AU - Boiarinov, S.
AU - Bradford, R.
AU - Branford, D.
AU - Briscoe, W. J.
AU - Brooks, W. K.
AU - Bültmann, S.
AU - Burkert, V. D.
AU - Butuceanu, C.
AU - Calarco, J. R.
AU - Careccia, S. L.
AU - Carman, D. S.
AU - Carnahan, B.
AU - Casey, L.
AU - Cazes, A.
AU - Chen, S.
AU - Cheng, L.
AU - Cole, P. L.
AU - Collins, P.
AU - Coltharp, P.
AU - Cords, D.
AU - Corvisiero, P.
AU - Crabb, D.
AU - Crannell, H.
AU - Crede, V.
AU - Cummings, J. P.
AU - Dale, D.
AU - Dashyan, N.
AU - De Masi, R.
AU - De Vita, R.
AU - De Sanctis, E.
AU - Degtyarenko, P. V.
AU - Denizli, H.
AU - Dennis, L.
AU - Deur, A.
AU - Dhamija, S.
AU - Dharmawardane, K. V.
AU - Dhuga, K. S.
AU - Dickson, R.
AU - Didelez, J. P.
AU - Djalali, C.
AU - Dodge, G. E.
AU - Doughty, D.
AU - Dugger, Michael
AU - Dytman, S.
AU - Dzyubak, O. P.
AU - Egiyan, H.
AU - Egiyan, K. S.
AU - El Fassi, L.
AU - Elouadrhiri, L.
AU - Eugenio, P.
AU - Fatemi, R.
AU - Fedotov, G.
AU - Fersch, R.
AU - Feuerbach, R. J.
AU - Forest, T. A.
AU - Fradi, A.
AU - Gavalian, G.
AU - Gevorgyan, N.
AU - Gilfoyle, G. P.
AU - Giovanetti, K. L.
AU - Girod, F. X.
AU - Goetz, J. T.
AU - Gohn, W.
AU - Gordon, C. I O
AU - Gothe, R. W.
AU - Graham, L.
AU - Griffioen, K. A.
AU - Guillo, M.
AU - Guler, N.
AU - Guo, L.
AU - Gyurjyan, V.
AU - Hadjidakis, C.
AU - Hafidi, K.
AU - Hakobyan, H.
AU - Hanretty, C.
AU - Hardie, J.
AU - Hassall, N.
AU - Heddle, D.
AU - Hersman, F. W.
AU - Hicks, K.
AU - Hleiqawi, I.
AU - Holtrop, M.
AU - Hourany, E.
AU - Hyde-Wright, C. E.
AU - Ilieva, Y.
AU - Ireland, D. G.
AU - Ishkhanov, B. S.
AU - Isupov, E. L.
AU - Ito, M. M.
AU - Jenkins, D.
AU - Jo, H. S.
AU - Johnstone, J. R.
AU - Joo, K.
AU - Juengst, H. G.
AU - Kalantarians, N.
AU - Keller, D.
AU - Kellie, J. D.
AU - Khandaker, M.
AU - Khetarpal, P.
AU - Kim, W.
AU - Klein, A.
AU - Klein, F. J.
AU - Klimenko, A. V.
AU - Kossov, M.
AU - Kramer, L. H.
AU - Kubarovsky, V.
AU - Kuhn, J.
AU - Kuhn, S. E.
AU - Kuleshov, S. V.
AU - Kuznetsov, V.
AU - Lachniet, J.
AU - Langheinrich, J.
AU - Lawrence, D.
AU - Li, Ji
AU - Livingston, K.
AU - Lu, H. Y.
AU - MacCormick, M.
AU - Marchand, C.
AU - Markov, N.
AU - Mattione, P.
AU - McAleer, S.
AU - McCracken, M.
AU - McKinnon, B.
AU - McNabb, J. W C
AU - Mecking, B. A.
AU - Mehrabyan, S.
AU - Melone, J. J.
AU - Mestayer, M. D.
AU - Meyer, C. A.
AU - Mibe, T.
AU - Mikhailov, K.
AU - Minehart, R.
AU - Mirazita, M.
AU - Miskimen, R.
AU - Mokeev, V.
AU - Morand, L.
AU - Moreno, B.
AU - Moriya, K.
AU - Moteabbed, M.
AU - Mueller, J.
AU - Munevar, E.
AU - Mutchler, G. S.
AU - Nadel-Turonski, P.
AU - Nasseripour, R.
AU - Niccolai, S.
AU - Niculescu, G.
AU - Niculescu, I.
AU - Niczyporuk, B. B.
AU - Niroula, M. R.
AU - Niyazov, R. A.
AU - Nozar, M.
AU - O'Rielly, G. V.
AU - Osipenko, M.
AU - Ostrovidov, A. I.
AU - Park, K.
AU - Park, S.
AU - Pasyuk, E.
AU - Paterson, C.
AU - Anefalos Pereira, S.
AU - Philips, S. A.
AU - Pierce, J.
AU - Pivnyuk, N.
AU - Pocanic, D.
AU - Pogorelko, O.
AU - Polli, E.
AU - Popa, I.
AU - Pozdniakov, S.
AU - Preedom, B. M.
AU - Price, J. W.
AU - Procureur, S.
AU - Prok, Y.
AU - Protopopescu, D.
AU - Qin, L. M.
AU - Raue, B. A.
AU - Riccardi, G.
AU - Ricco, G.
AU - Ripani, M.
AU - Ritchie, Barry
AU - Rosner, G.
AU - Rossi, P.
AU - Rubin, P. D.
AU - Sabatié, F.
AU - Saini, M. S.
AU - Salamanca, J.
AU - Salgado, C.
AU - Santoro, J. P.
AU - Sapunenko, V.
AU - Schott, D.
AU - Schumacher, R. A.
AU - Serov, V. S.
AU - Sharabian, Y. G.
AU - Sharov, D.
AU - Shvedunov, N. V.
AU - Skabelin, A. V.
AU - Smith, L. C.
AU - Sober, D. I.
AU - Sokhan, D.
AU - Stavinsky, A.
AU - Stepanyan, S. S.
AU - Stepanyan, S.
AU - Stokes, B. E.
AU - Stoler, P.
AU - Strakovsky, I. I.
AU - Strauch, S.
AU - Taiuti, M.
AU - Tedeschi, D. J.
AU - Tkabladze, A.
AU - Tkachenko, S.
AU - Todor, L.
AU - Tur, C.
AU - Ungaro, M.
AU - Vineyard, M. F.
AU - Vlassov, A. V.
AU - Watts, D. P.
AU - Weinstein, L. B.
AU - Weygand, D. P.
AU - Williams, M.
AU - Wolin, E.
AU - Wood, M. H.
AU - Yegneswaran, A.
AU - Yurov, M.
AU - Zana, L.
AU - Zhang, J.
AU - Zhao, B.
AU - Zhao, Z. W.
PY - 2009/1
Y1 - 2009/1
N2 - The ep → e ′ pρ0 reaction has been measured using the 5.754GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W , Q2 and t dependences of the cross-section are compared to theoretical calculations based on the t -channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the ≈ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
AB - The ep → e ′ pρ0 reaction has been measured using the 5.754GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W , Q2 and t dependences of the cross-section are compared to theoretical calculations based on the t -channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the ≈ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
UR - http://www.scopus.com/inward/record.url?scp=60649083568&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=60649083568&partnerID=8YFLogxK
U2 - 10.1140/epja/i2008-10683-5
DO - 10.1140/epja/i2008-10683-5
M3 - Article
AN - SCOPUS:60649083568
VL - 39
SP - 5
EP - 31
JO - European Physical Journal A
JF - European Physical Journal A
SN - 1434-6001
IS - 1
ER -