Abstract
The exclusive ω electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross-sections were measured up to large values of the four-momentum transfer (- t < 2.7 GeV2) to the proton. The contributions of the interference terms σTT and σTL to the cross-sections, as well as an analysis of the ω spin density matrix, indicate that helicity is not conserved in this process. The t-channel π0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction γ* p → ωp, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross-sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 445-458 |
| Number of pages | 14 |
| Journal | European Physical Journal A |
| Volume | 24 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jun 2005 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Deeply virtual and exclusive electroproduction of ω-mesons. / Morand, L.; Doré, D.; Garçon, M.; Guidal, M.; Laget, J. M.; Morrow, S.; Sabatié, F.; Smith, E.; Adams, G.; Ambrozewicz, P.; Anghinolfi, M.; Asryan, G.; Audit, G.; Avakian, H.; Bagdasaryan, H.; Ball, J.; Ball, J. P.; Baltzell, N. A.; Barrow, S.; Batourine, V.; Battaglieri, M.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Berman, B. L.; Biselli, A. S.; Boiarinov, S.; Bonner, B. E.; Bouchigny, 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.; Cazes, A.; Chen, S.; Cole, P. L.; Cords, D.; Corvisiero, P.; Crabb, D.; Cummings, J. P.; de Sanctis, E.; DeVita, R.; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Dharmawardane, K. V.; Dhuga, K. S.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dugger, Michael; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Eugenio, P.; Fatemi, R.; Feldman, G.; Fersch, R. G.; Feuerbach, R. J.; Funsten, H.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gordon, C. I O; Gothe, R. W.; Griffioen, K. A.; Guillo, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hakobyan, R. S.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ito, M. M.; Jenkins, D.; Jo, H. S.; Joo, K.; Juengst, H. G.; Kellie, J. D.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A. V.; Kossov, M.; Kubarovski, V.; Kramer, L. H.; Kuhn, S. E.; Kuhn, J.; Lachniet, J.; Langheinrich, J.; Lawrence, D.; Lee, T.; Ji, L.; Livingston, K.; Marchand, C.; Maximon, L. C.; McAleer, S.; McKinnon, B.; McNabb, J. W C; Mecking, B. A.; Mehrabyan, S.; Melone, J. J.; Mestayer, M. D.; Meyer, C. A.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Mueller, J.; Mutchler, G. S.; Napolitano, J.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niyazov, R. A.; Nozar, M.; O'Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Philips, S. A.; Pivnyuk, N.; Pocanic, D.; Pogorelko, O.; Polli, E.; Popa, I.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Rubin, P. D.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Shaw, J.; Skabelin, A. V.; Smith, L. C.; Sober, D. I.; Stavinsky, A.; Stepanyan, S.; Stepanyan, S. S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tedeschi, D. J.; Thoma, U.; Tkabladze, A.; Todor, L.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Zana, L.
In: European Physical Journal A, Vol. 24, No. 3, 06.2005, p. 445-458.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Deeply virtual and exclusive electroproduction of ω-mesons
AU - Morand, L.
AU - Doré, D.
AU - Garçon, M.
AU - Guidal, M.
AU - Laget, J. M.
AU - Morrow, S.
AU - Sabatié, F.
AU - Smith, E.
AU - Adams, G.
AU - Ambrozewicz, P.
AU - Anghinolfi, M.
AU - Asryan, G.
AU - Audit, G.
AU - Avakian, H.
AU - Bagdasaryan, H.
AU - Ball, J.
AU - Ball, J. P.
AU - Baltzell, N. A.
AU - Barrow, S.
AU - Batourine, V.
AU - Battaglieri, M.
AU - Bektasoglu, M.
AU - Bellis, M.
AU - Benmouna, N.
AU - Berman, B. L.
AU - Biselli, A. S.
AU - Boiarinov, S.
AU - Bonner, B. E.
AU - Bouchigny, 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 - Cazes, A.
AU - Chen, S.
AU - Cole, P. L.
AU - Cords, D.
AU - Corvisiero, P.
AU - Crabb, D.
AU - Cummings, J. P.
AU - de Sanctis, E.
AU - DeVita, R.
AU - Degtyarenko, P. V.
AU - Denizli, H.
AU - Dennis, L.
AU - Deur, A.
AU - Dharmawardane, K. V.
AU - Dhuga, K. S.
AU - Djalali, C.
AU - Dodge, G. E.
AU - Donnelly, J.
AU - Doughty, D.
AU - Dugger, Michael
AU - Dytman, S.
AU - Dzyubak, O. P.
AU - Egiyan, H.
AU - Egiyan, K. S.
AU - Elouadrhiri, L.
AU - Eugenio, P.
AU - Fatemi, R.
AU - Feldman, G.
AU - Fersch, R. G.
AU - Feuerbach, R. J.
AU - Funsten, H.
AU - Gavalian, G.
AU - Gilfoyle, G. P.
AU - Giovanetti, K. L.
AU - Girod, F. X.
AU - Goetz, J. T.
AU - Gordon, C. I O
AU - Gothe, R. W.
AU - Griffioen, K. A.
AU - Guillo, M.
AU - Guler, N.
AU - Guo, L.
AU - Gyurjyan, V.
AU - Hadjidakis, C.
AU - Hakobyan, R. S.
AU - Hardie, J.
AU - Heddle, D.
AU - Hersman, F. W.
AU - Hicks, K.
AU - Hleiqawi, I.
AU - Holtrop, M.
AU - Hyde-Wright, C. E.
AU - Ilieva, Y.
AU - Ireland, D. G.
AU - Ito, M. M.
AU - Jenkins, D.
AU - Jo, H. S.
AU - Joo, K.
AU - Juengst, H. G.
AU - Kellie, J. D.
AU - Khandaker, M.
AU - Kim, W.
AU - Klein, A.
AU - Klein, F. J.
AU - Klimenko, A. V.
AU - Kossov, M.
AU - Kubarovski, V.
AU - Kramer, L. H.
AU - Kuhn, S. E.
AU - Kuhn, J.
AU - Lachniet, J.
AU - Langheinrich, J.
AU - Lawrence, D.
AU - Lee, T.
AU - Ji, L.
AU - Livingston, K.
AU - Marchand, C.
AU - Maximon, L. C.
AU - McAleer, S.
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 - Mikhailov, K.
AU - Minehart, R.
AU - Mirazita, M.
AU - Miskimen, R.
AU - Mokeev, V.
AU - Mueller, J.
AU - Mutchler, G. S.
AU - Napolitano, J.
AU - Nasseripour, R.
AU - Niccolai, S.
AU - Niculescu, G.
AU - Niculescu, I.
AU - Niczyporuk, B. B.
AU - Niyazov, R. A.
AU - Nozar, M.
AU - O'Rielly, G. V.
AU - Osipenko, M.
AU - Ostrovidov, A. I.
AU - Park, K.
AU - Pasyuk, E.
AU - Philips, S. A.
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 - Prok, Y.
AU - Protopopescu, D.
AU - Raue, B. A.
AU - Riccardi, G.
AU - Ricco, G.
AU - Ripani, M.
AU - Ritchie, Barry
AU - Ronchetti, F.
AU - Rosner, G.
AU - Rossi, P.
AU - Rubin, P. D.
AU - Salgado, C.
AU - Santoro, J. P.
AU - Sapunenko, V.
AU - Schumacher, R. A.
AU - Serov, V. S.
AU - Sharabian, Y. G.
AU - Shaw, J.
AU - Skabelin, A. V.
AU - Smith, L. C.
AU - Sober, D. I.
AU - Stavinsky, A.
AU - Stepanyan, S.
AU - Stepanyan, S. S.
AU - Stokes, B. E.
AU - Stoler, P.
AU - Strakovsky, I. I.
AU - Strauch, S.
AU - Taiuti, M.
AU - Tedeschi, D. J.
AU - Thoma, U.
AU - Tkabladze, A.
AU - Todor, L.
AU - Tur, C.
AU - Ungaro, M.
AU - Vineyard, M. F.
AU - Vlassov, A. V.
AU - Weinstein, L. B.
AU - Weygand, D. P.
AU - Williams, M.
AU - Wolin, E.
AU - Wood, M. H.
AU - Yegneswaran, A.
AU - Zana, L.
PY - 2005/6
Y1 - 2005/6
N2 - The exclusive ω electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross-sections were measured up to large values of the four-momentum transfer (- t < 2.7 GeV2) to the proton. The contributions of the interference terms σTT and σTL to the cross-sections, as well as an analysis of the ω spin density matrix, indicate that helicity is not conserved in this process. The t-channel π0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction γ* p → ωp, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross-sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.
AB - The exclusive ω electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q2) with the 5.75 GeV beam at CEBAF and the CLAS spectrometer. Cross-sections were measured up to large values of the four-momentum transfer (- t < 2.7 GeV2) to the proton. The contributions of the interference terms σTT and σTL to the cross-sections, as well as an analysis of the ω spin density matrix, indicate that helicity is not conserved in this process. The t-channel π0 exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction γ* p → ωp, even for Q2 as large as 5 GeV2. Contributions of handbag diagrams, related to Generalized Parton Distributions in the nucleon, are therefore difficult to extract for this process. Remarkably, the high-t behaviour of the cross-sections is nearly Q2-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.
UR - http://www.scopus.com/inward/record.url?scp=21644444783&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=21644444783&partnerID=8YFLogxK
U2 - 10.1140/epja/i2005-10032-4
DO - 10.1140/epja/i2005-10032-4
M3 - Article
AN - SCOPUS:21644444783
VL - 24
SP - 445
EP - 458
JO - European Physical Journal A
JF - European Physical Journal A
SN - 1434-6001
IS - 3
ER -