Journalartikel
Autorenliste: Morand, L; Doré, D; Garçon, M; Guidal, M; Laget, JM; Morrow, S; Sabatié, F; Smith, E; Adams, G; Arnbrozewicz, 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; Langhenirich, J; Lawrence, D; Lee, T; Li, J; 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, BG; 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
Jahr der Veröffentlichung: 2005
Seiten: 445-458
Zeitschrift: The European Physical Journal A
Bandnummer: 24
Heftnummer: 3
ISSN: 1434-6001
eISSN: 1434-601X
DOI Link: https://doi.org/10.1140/epja/i2005-10032-4
Verlag: Springer
Abstract:
The exclusive w electroproduction off the proton was studied in a large kinematical domain above the nucleon resonance region and for the highest possible photon virtuality (Q(2)) 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 sigma(TT) and sigma(TL) to the cross-sections, as well as an analysis of the w spin density matrix, indicate that helicity is not conserved in this process. The t-channel pi(0) exchange, or more generally the exchange of the associated Regge trajectory, seems to dominate the reaction gamma*p -> wp, even for Q(2) 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 Q(2)-independent, which may be interpreted as a coupling of the photon to a point-like object in this kinematical limit.
Zitierstile
Harvard-Zitierstil: Morand, L., Doré, D., Garçon, M., Guidal, M., Laget, J., Morrow, S., et al. (2005) Deeply virtual and exclusive electroproduction of ω-mesons, The European Physical Journal A, 24(3), pp. 445-458. https://doi.org/10.1140/epja/i2005-10032-4
APA-Zitierstil: Morand, L., Doré, D., Garçon, M., Guidal, M., Laget, J., Morrow, S., Sabatié, F., Smith, E., Adams, G., Arnbrozewicz, P., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Ball, J., Ball, J., Baltzell, N., Barrow, S., ...Zana, L. (2005). Deeply virtual and exclusive electroproduction of ω-mesons. The European Physical Journal A. 24(3), 445-458. https://doi.org/10.1140/epja/i2005-10032-4
Schlagwörter
CLAS; GENERALIZED PARTON DISTRIBUTIONS; PHOTON; SPIN; VECTOR-MESONS
