Deeply virtual and exclusive electroproduction of ω-mesons

L. Morand, D. Doré, M. Garçon, M. Guidal, J. M. Laget, S. Morrow, F. Sabatié, E. Smith, G. Adams, P. Ambrozewicz, M. Anghinolfi, G. Asryan, G. Audit, H. Avakian, H. Bagdasaryan, J. Ball, J. P. Ball, N. A. Baltzell, S. Barrow, V. BatourineM. Battaglieri, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, A. Cazes, S. Chen, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, J. P. Cummings, E. de Sanctis, R. DeVita, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, Michael Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, P. Eugenio, R. Fatemi, G. Feldman, R. G. Fersch, R. J. Feuerbach, H. Funsten, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, C. I O Gordon, R. W. Gothe, K. A. Griffioen, M. Guillo, N. Guler, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, H. G. Juengst, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, V. Kubarovski, L. H. Kramer, S. E. Kuhn, J. Kuhn, J. Lachniet, J. Langheinrich, D. Lawrence, T. Lee, L. Ji, K. Livingston, C. Marchand, L. C. Maximon, S. McAleer, B. McKinnon, J. W C McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O'Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, Barry Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, A. V. Skabelin, L. C. Smith, D. I. Sober, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana

Research output: Contribution to journal › Article

42 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)445-458
Number of pages14
JournalEuropean Physical Journal A
Volume24
Issue number3
DOIs
StatePublished - Jun 2005

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mesons
cross sections
protons
photons
partons
momentum transfer
diagrams
trajectories
spectrometers
interference

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Morand, L., Doré, D., Garçon, M., Guidal, M., Laget, J. M., Morrow, S., ... Zana, L. (2005). Deeply virtual and exclusive electroproduction of ω-mesons. European Physical Journal A, 24(3), 445-458. https://doi.org/10.1140/epja/i2005-10032-4

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

Morand, L, Doré, D, Garçon, M, Guidal, M, Laget, JM, Morrow, S, Sabatié, F, Smith, E, Adams, G, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Audit, G, Avakian, H, Bagdasaryan, H, Ball, J, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, BL, Biselli, AS, Boiarinov, S, Bonner, BE, Bouchigny, S, Bradford, R, Branford, D, Briscoe, WJ, Brooks, WK, Bültmann, S, Burkert, VD, Butuceanu, C, Calarco, JR, Careccia, SL, Carman, DS, Cazes, A, Chen, S, Cole, PL, Cords, D, Corvisiero, P, Crabb, D, Cummings, JP, de Sanctis, E, DeVita, R, Degtyarenko, PV, Denizli, H, Dennis, L, Deur, A, Dharmawardane, KV, Dhuga, KS, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Egiyan, KS, Elouadrhiri, L, Eugenio, P, Fatemi, R, Feldman, G, Fersch, RG, Feuerbach, RJ, Funsten, H, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gordon, CIO, Gothe, RW, Griffioen, KA, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hakobyan, RS, Hardie, J, Heddle, D, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde-Wright, CE, Ilieva, Y, Ireland, DG, Ito, MM, Jenkins, D, Jo, HS, Joo, K, Juengst, HG, Kellie, JD, Khandaker, M, Kim, W, Klein, A, Klein, FJ, Klimenko, AV, Kossov, M, Kubarovski, V, Kramer, LH, Kuhn, SE, Kuhn, J, Lachniet, J, Langheinrich, J, Lawrence, D, Lee, T, Ji, L, Livingston, K, Marchand, C, Maximon, LC, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mehrabyan, S, Melone, JJ, Mestayer, MD, Meyer, CA, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Mueller, J, Mutchler, GS, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Philips, SA, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, E, Popa, I, Pozdniakov, S, Preedom, BM, Price, JW, Prok, Y, Protopopescu, D, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, B, Ronchetti, F, Rosner, G, Rossi, P, Rubin, PD, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Shaw, J, Skabelin, AV, Smith, LC, Sober, DI, Stavinsky, A, Stepanyan, S, Stepanyan, SS, Stokes, BE, Stoler, P, Strakovsky, II, Strauch, S, Taiuti, M, Tedeschi, DJ, Thoma, U, Tkabladze, A, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A & Zana, L 2005, 'Deeply virtual and exclusive electroproduction of ω-mesons', European Physical Journal A, vol. 24, no. 3, pp. 445-458. https://doi.org/10.1140/epja/i2005-10032-4
Morand L, Doré D, Garçon M, Guidal M, Laget JM, Morrow S et al. Deeply virtual and exclusive electroproduction of ω-mesons. European Physical Journal A. 2005 Jun;24(3):445-458. https://doi.org/10.1140/epja/i2005-10032-4
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. / Deeply virtual and exclusive electroproduction of ω-mesons. In: European Physical Journal A. 2005 ; Vol. 24, No. 3. pp. 445-458.
@article{0da950b24a034d20ad4dbb7b1fd4c581,
title = "Deeply virtual and exclusive electroproduction of ω-mesons",
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.",
author = "L. Morand and D. Dor{\'e} and M. Gar{\cc}on and M. Guidal and Laget, {J. M.} and S. Morrow and F. Sabati{\'e} and E. Smith and G. Adams and P. Ambrozewicz and M. Anghinolfi and G. Asryan and G. Audit and H. Avakian and H. Bagdasaryan and J. Ball and Ball, {J. P.} and Baltzell, {N. A.} and S. Barrow and V. Batourine and M. Battaglieri and M. Bektasoglu and M. Bellis and N. Benmouna and Berman, {B. L.} and Biselli, {A. S.} and S. Boiarinov and Bonner, {B. E.} and S. Bouchigny and R. Bradford and D. Branford and Briscoe, {W. J.} and Brooks, {W. K.} and S. B{\"u}ltmann and Burkert, {V. D.} and C. Butuceanu and Calarco, {J. R.} and Careccia, {S. L.} and Carman, {D. S.} and A. Cazes and S. Chen and Cole, {P. L.} and D. Cords and P. Corvisiero and D. Crabb and Cummings, {J. P.} and {de Sanctis}, E. and R. DeVita and Degtyarenko, {P. V.} and H. Denizli and L. Dennis and A. Deur and Dharmawardane, {K. V.} and Dhuga, {K. S.} and C. Djalali and Dodge, {G. E.} and J. Donnelly and D. Doughty and Michael Dugger and S. Dytman and Dzyubak, {O. P.} and H. Egiyan and Egiyan, {K. S.} and L. Elouadrhiri and P. Eugenio and R. Fatemi and G. Feldman and Fersch, {R. G.} and Feuerbach, {R. J.} and H. Funsten and G. Gavalian and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and Gordon, {C. I O} and Gothe, {R. W.} and Griffioen, {K. A.} and M. Guillo and N. Guler and L. Guo and V. Gyurjyan and C. Hadjidakis and Hakobyan, {R. S.} and J. Hardie and D. Heddle and Hersman, {F. W.} and K. Hicks and I. Hleiqawi and M. Holtrop and Hyde-Wright, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ito, {M. M.} and D. Jenkins and Jo, {H. S.} and K. Joo and Juengst, {H. G.} and Kellie, {J. D.} and M. Khandaker and W. Kim and A. Klein and Klein, {F. J.} and Klimenko, {A. V.} and M. Kossov and V. Kubarovski and Kramer, {L. H.} and Kuhn, {S. E.} and J. Kuhn and J. Lachniet and J. Langheinrich and D. Lawrence and T. Lee and L. Ji and K. Livingston and C. Marchand and Maximon, {L. C.} and S. McAleer and B. McKinnon and McNabb, {J. W C} and Mecking, {B. A.} and S. Mehrabyan and Melone, {J. J.} and Mestayer, {M. D.} and Meyer, {C. A.} and K. Mikhailov and R. Minehart and M. Mirazita and R. Miskimen and V. Mokeev and J. Mueller and Mutchler, {G. S.} and J. Napolitano and R. Nasseripour and S. Niccolai and G. Niculescu and I. Niculescu and Niczyporuk, {B. B.} and Niyazov, {R. A.} and M. Nozar and O'Rielly, {G. V.} and M. Osipenko and Ostrovidov, {A. I.} and K. Park and E. Pasyuk and Philips, {S. A.} and N. Pivnyuk and D. Pocanic and O. Pogorelko and E. Polli and I. Popa and S. Pozdniakov and Preedom, {B. M.} and Price, {J. W.} and Y. Prok and D. Protopopescu and Raue, {B. A.} and G. Riccardi and G. Ricco and M. Ripani and Barry Ritchie and F. Ronchetti and G. Rosner and P. Rossi and Rubin, {P. D.} and C. Salgado and Santoro, {J. P.} and V. Sapunenko and Schumacher, {R. A.} and Serov, {V. S.} and Sharabian, {Y. G.} and J. Shaw and Skabelin, {A. V.} and Smith, {L. C.} and Sober, {D. I.} and A. Stavinsky and S. Stepanyan and Stepanyan, {S. S.} and Stokes, {B. E.} and P. Stoler and Strakovsky, {I. I.} and S. Strauch and M. Taiuti and Tedeschi, {D. J.} and U. Thoma and A. Tkabladze and L. Todor and C. Tur and M. Ungaro and Vineyard, {M. F.} and Vlassov, {A. V.} and Weinstein, {L. B.} and Weygand, {D. P.} and M. Williams and E. Wolin and Wood, {M. H.} and A. Yegneswaran and L. Zana",
year = "2005",
month = "6",
doi = "10.1140/epja/i2005-10032-4",
language = "English (US)",
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pages = "445--458",
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}

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.

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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 - Zeitschrift für Physik

JF - Zeitschrift für Physik

SN - 0044-3328

IS - 3

ER -

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