Electroproduction of the Lambda(1520) hyperon - art. no. 044601

Barrow, SP Dennis, L McAleer, SB Adams, G Amaryan, MJ Anciant, E Anghinolfi, M Asavapibhop, B Asryan, G Audit, G Auger, T Avakian, H Ball, JP Battaglieri, M Beard, K Bektasoglu, M Bianchi, N Biselli, AS Boiarinov, S Bonner, BE Bouchigny, S Branford, D Briscoe, WJ Brooks, WK Burkert, VD Calarco, JR Capitani, GP Carman, DS Carnahan, B Ciciani, L Clark, R Cole, PL Coleman, A Connelly, J Cords, D Corvisiero, P Crabb, D Crannell, H Cummings, JP DeSanctis, E DeVita, R Degtyarenko, PV Demirchyan, R Deppman, A Dhuga, KS Djalali, C Dodge, GE Domingo, J Doughty, D Dragovitsch, P Dugger, M Dytman, S Eckhause, M Efremenko, Y Egiyan, H Egiyan, KS Elouadrhiri, L Empl, A Farhi, L Feuerbach, RJ Ficenec, J Forest, TA Frolov, V Funsten, H Gaff, SJ Gai, M Gavalian, G Gavrilov, V Gilad, S Gilfoyle, GP Giovanetti, KL Girard, P Griffioen, K Guidal, M Guillo, M Gyurjyan, V Hancock, D Hardie, J Heddle, D Heisenberg, J Hersman, FW Hicks, K Hicks, RS Holtrop, M Hu, J Fatemi, R Hyde-Wright, CE Ito, MM Jenkins, D Joo, K Kelley, JH Khandaker, M Kim, KY Kim, K Kim, W Klein, A Klein, FJ Klusman, M Kossov, M Kramer, LH Kuang, Y Kuhn, SE Laget, JM Lawrence, D Leksin, GA Longhi, A Lucas, M Lukashin, K Major, RW Manak, JJ Marchand, C Matthews, SK McCarthy, J McNabb, JWC Mecking, BA Mestayer, MD Meyer, CA Mikhailov, K Minehart, R Mirazita, M Miskimen, R Muccifora, V Mueller, J Murphy, LY Mutchler, GS Napolitano, J Nelson, SO Niculescu, G Niculescu, I Niyazov, RA O'Brien, JT O'Rielly, GV Opper, AK Park, K Paschke, K Pasyuk, E Patois, Y Peterson, G Philips, SA 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, C Sanzone-Arenhovel, M Sapunenko, V Schumacher, RA Serov, VS Sharabian, YG Shaw, J Shuvalov, S Skabelin, AV Smith, ES Smith, T Smith, LC Sober, DI Spraker, M Stavinsky, A Stepanyan, S Stoler, P Taiuti, M Taylor, S Tedeschi, DJ Thompson, R Tung, TY Vineyard, MF Vlassov, AV Wang, K Weinstein, LB Weisberg, A Weller, H Weygand, DP Whisnant, CS Witkowski, M Wolin, E Yegneswaran, A Yun, J Zhang, B Zhao, J Zhou, Z

Sp. Barrow et al., Electroproduction of the Lambda(1520) hyperon - art. no. 044601, PHYS REV C, 6404(4), 2001, pp. 4601

30

INGLESE

Article

Physics

PHYSICAL REVIEW C

0556-2813 → ACNP

6404

4

2001

ISI

0556-2813(200110)6404:4<4601:EOTLH->2.0.ZU;2-Y

The reaction ep-->e'K(+)Lambda (1520) with Lambda (1520)-->p'K- was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS dete ctor at the Thomas Jefferson National Accelerator Facility. The cos theta ( K+), phi (K+), Q(2), and W dependencies of Lambda (1520) electroproduction are presented for the kinematic region 0.9<Q(2)<2.4 GeV2 and 1.95<W<2.65 Ge V. Also, the Q(2) dependence of the <Lambda>(1520) decay angular distributi on is presented for the first time. The COS theta (K+) angular distribution s suggest t-channel diagrams dominate the production process. Fits to the L ambda (1520) t-channel helicity frame decay angular distributions indicate the m(z) = +/- 1/2 parentage accounts for about 60% of the total yield, whi ch suggests this reaction has a significant contribution from t-channel pro cesses with either K+ exchange or longitudinal coupling to an exchanged K*. The Q(2) dependence of the Lambda (1520) production cross section is the s ame as that observed for Lambda (1116) photo- and electroproduction.