Exclusive electroproduction of phi mesons at 4.2 GeV - art. no. 065205

Lukashin, K Smith, ES Adams, GS Anciant, E Anghinolfi, M Asavapibhop, B Audit, G Auger, T Avakian, H Ball, J Barrow, S Battaglieri, M Beard, K Bektasoglu, M Bertozzi, W Bianchi, N Biselli, A Boiarinov, S Bonner, BE Bouchigny, S Branford, D Briscoe, WJ Brooks, WK Burkert, VD Calarco, JR Carman, DS Carnahan, B Ciciani, L Clark, R Cole, PL Coleman, A Cords, D Corvisiero, P Crabb, D Crannell, H Cummings, J Degtiarenko, PV Dennis, LC De Sanctis, E DeVita, R Dhuga, KS Djalali, C Dodge, GE Domingo, J Doughty, D Dragovitsch, P Dytman, S Eckhause, M Egiyan, H Egiyan, KS Elouadrhiri, L Empl, A Fatemi, R Feuerbach, RJ Ficenec, J Fissum, K Forest, TA Freyberger, A Funsten, H Gaff, S Gai, M Gavalian, G Gilad, S Gilfoyle, G Giovanetti, K Girard, P Griffioen, KA Guidal, M Guillo, M Gyurjyan, V Hardie, J Heddle, D Hersman, FW Hicks, K Hicks, RS Holtrop, M Hu, J Hyde-Wright, CE Ito, MM Jenkins, D Joo, K Kelley, J Khandaker, M Kim, K Kim, KY Kim, W Klein, A Klein, FJ Klusman, M Kossov, M Kramer, LH Kuhn, SE Laget, JM Lawrence, D Longhi, A Manak, JJ Marchand, C McAleer, S McCarthy, J McNabb, JWC Mecking, BA Mestayer, MD Meyer, CA Mikhailov, K Minehart, R Mirazita, M Miskimen, R Muccifora, V Mueller, J Mutchler, GS Napolitano, J Nelson, S Niculescu, G Niculescu, I Niczyporuk, BB Niyazov, RA Opper, A O'Rielly, G O'Brien, JT Park, K Paschke, K Pasyuk, E Peterson, GA Philips, S Pivnyuk, N Pocanic, D Pogorelko, O Polli, E Pozdniakov, S Preedom, BM Price, JW Qin, LM Raue, BA Reolon, AR Riccardi, G Ricco, G Ripani, M Ritchie, BG Ronchetti, F Rossi, P Rowntree, D Rubin, PD Sabatie, F Sabourov, K Salgado, CW Sapunenko, V Schumacher, RA Serov, V Sharabian, YG Shaw, J Simionatto, S Skabelin, A Smith, LC Sober, DI Stavinsky, A Stepanyan, S Stoler, P Strakovsky, II Taiuti, M Taylor, S Tedeschi, D Thompson, R Vineyard, MF Vlassov, A Wang, K Weller, H Weinstein, LB Welsh, R Weygand, DP Whisnant, S Wolin, E Yanik, L Yegneswaran, A Yun, J Zhao, J Zhang, B Zhou, Z
K. Lukashin et al., Exclusive electroproduction of phi mesons at 4.2 GeV - art. no. 065205, PHYS REV C, 6306(6), 2001, pp. 5205
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Categorie Soggetti
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ISSN journal
0556-2813 → ACNP
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We studied the exclusive reaction ep --> e' p' phi using the phi -->K+ K- d ecay mode. The data were collected using a 4.2 GeV incident electron beam a nd the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson N ational Accelerator Facility. Our experiment covers the range in Q(2) from 0.7 to 2.2 GeV2 and W from 2.0 to 2.6 GeV. Taken together with all previous data, we find a consistent picture of phi production on the proton. Our me asurement shows the expected decrease of the t slope with the vector-meson formation time c Delta tau below 2 fm. At <c Delta tau > = 0.6 fm, we measu re b(phi) = 2.27 +/- 0.42 GeV-2. The cross section dependence on W as W0.2 +/- 0.1 at Q(2), 1.3 GeV2 was determined by comparison with phi production at HERA after correcting for threshold effects. This is the same dependence as observed in photoproduction.