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. 2002 Feb 25;88(8):082001.
doi: 10.1103/PhysRevLett.88.082001. Epub 2002 Feb 8.

First measurement of the double spin asymmetry in (-->)e(-->)p-->e(prime)pi(+)n in the resonance region

R De Vita  1 , M Anghinolfi, V D Burkert, G E Dodge, R Minehart, M Taiuti, H Weller, G Adams, M J Amaryan, E Anciant, D S Armstrong, B Asavapibhop, G Asryan, G Audit, T Auger, H Avakian, H Bagdasaryan, J P Ball, S Barrow, M Battaglieri, K Beard, M Bektasoglu, N Bianchi, A S Biselli, S Boiarinov, B E Bonner, P Bosted, S Bouchigny, D Branford, W K Brooks, S Bueltmann, J R Calarco, G P Capitani, D S Carman, B Carnahan, A Cazes, L Ciciani, P L Cole, A Coleman, J Connelly, D Cords, P Corvisiero, D Crabb, H Crannell, J P Cummings, E De Sanctis, P V Degtyarenko, R Demirchyan, H Denizli, L Dennis, K V Dharmawardane, K S Dhuga, C Djalali, D Doughty, P Dragovitsch, M Dugger, S Dytman, M Eckhause, H Egiyan, K S Egiyan, L Elouadrhiri, A Empl, L Farhi, R Fatemi, R J Feuerbach, J Ficenec, T A Forest, V Frolov, H Funsten, S J Gaff, M Gai, M Garçon, G Gavalian, S Gilad, G P Gilfoyle, K L Giovanetti, P Girard, E Golovatch, K Griffioen, M Guidal, M Guillo, V Gyurjyan, C Hadjidakis, D Hancock, J Hardie, D Heddle, P Heimberg, F W Hersman, K Hicks, R S Hicks, M Holtrop, J Hu, C E Hyde-Wright, B S Ishkanov, M M Ito, D Jenkins, K Joo, J H Kelley, J D Kellie, M Khandaker, K Y Kim, K Kim, W Kim, A Klein, F J Klein, M Klusman, M Kossov, L H Kramer, Y Kuang, S E Kuhn, J Lachniet, J M Laget, D Lawrence, Ji Li, K Livingston, A Longhi, K Loukachine, M Lucas, W Major, J J Manak, C Marchand, S McAleer, J McCarthy, J W C McNabb, B A Mecking, M D Mestayer, C A Meyer, K Mikhailov, M Mirazita, R Miskimen, V Mokeev, V Muccifora, J Mueller, G S Mutchler, J Napolitano, S O Nelson, G Niculescu, I Niculescu, B B Niczyporuk, R A Niyazov, A K Opper, G V O'Rielly, M Osipenko, K Park, E Pasyuk, G Peterson, S A Philips, N Pivnyuk, D Pocanic, O Pogorelko, E Polli, S Pozdniakov, B M Preedom, J W Price, Y Prok, D Protopopescu, L M Qin, B A Raue, A R Reolon, G Riccardi, G Ricco, M Ripani, B G Ritchie, S Rock, F Ronchetti, P Rossi, D Rowntree, P D Rubin, F Sabatié, K Sabourov, C Salgado, V Sapunenko, M Sargsyan, R A Schumacher, V S Serov, A Shafi, Y G Sharabian, J Shaw, A V Skabelin, E S Smith, T Smith, L C Smith, D I Sober, L Sorrell, M Spraker, A Stavinsky, S Stepanyan, P Stoler, I I Strakovsky, S Taylor, D J Tedeschi, R Thompson, L Todor, M Ungaro, M F Vineyard, A V Vlassov, K Wang, L B Weinstein, A Weisberg, D P Weygand, C S Whisnant, E Wolin, A Yegneswaran, J Yun, B Zhang, J Zhao, Z Zhou
Affiliations

First measurement of the double spin asymmetry in (-->)e(-->)p-->e(prime)pi(+)n in the resonance region

R De Vita et al. Phys Rev Lett. .

Abstract

The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.

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