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

R De Vita; 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

doi:10.1103/PhysRevLett.88.082001

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

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

Authors

R De Vita¹, 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

Affiliation

¹ Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica dell'Università, 16146 Genova, Italy.

PMID: 11863951
DOI: 10.1103/PhysRevLett.88.082001

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.