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. Batourine; M. 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

doi:10.1140/epja/i2005-10032-4

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 › peer-review

38 Scopus citations

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 σ_TT and σ_TL 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	https://doi.org/10.1140/epja/i2005-10032-4
State	Published - Jun 2005

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1140/epja/i2005-10032-4

Cite this

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., ... 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

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

@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{\c c}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 = jun,

doi = "10.1140/epja/i2005-10032-4",

language = "English (US)",

volume = "24",

pages = "445--458",

journal = "European Physical Journal A",

issn = "1434-6001",

number = "3",

}

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

SN - 1434-6001

VL - 24

SP - 445

EP - 458

JO - European Physical Journal A

JF - European Physical Journal A

IS - 3

ER -

Deeply virtual and exclusive electroproduction of ω-mesons

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Deeply virtual and exclusive electroproduction of omega mesons.

Deeply virtual and exclusive electroproduction of omega mesons.

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Deeply virtual and exclusive electroproduction of ω-mesons

Abstract

ASJC Scopus subject areas

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Deeply virtual and exclusive electroproduction of omega mesons.

Deeply virtual and exclusive electroproduction of omega mesons.

Cite this