First measurement of the double spin asymmetry in e→ p→ → e′ π+ n in the resonance region Article

de Vita, R, Anghinolfi, M, Burkert, VD et al. (2002). First measurement of the double spin asymmetry in e→ p→ → e′ π+ n in the resonance region . PHYSICAL REVIEW LETTERS, 88(8),

cited authors

  • de Vita, R; Anghinolfi, M; Burkert, VD; Dodge, GE; Minehart, R; Taiuti, M; Weller, H; Adams, G; Amaryan, MJ; Anciant, E; Armstrong, DS; Asavapibhop, B; Asryan, G; Audit, G; Auger, T; Avakian, H; Bagdasaryan, H; Ball, JP; Barrow, S; Battaglieri, M; Beard, K; Bektasoglu, M; Bianchi, N; Biselli, AS; Boiarinov, S; Bonner, BE; Bosted, P; Bouchigny, S; Branford, D; Brooks, WK; Bueltmann, S; Calarco, JR; Capitani, GP; Carman, DS; Carnahan, B; Cazes, A; Ciciani, L; Cole, PL; Coleman, A; Connelly, J; Cords, D; Corvisiero, P; Crabb, D; Crannell, H; Cummings, JP; de Sanctis, E; Degtyarenko, PV; Demirchyan, R; Denizli, H; Dennis, L; Dharmawardane, KV; Dhuga, KS; Djalali, C; Doughty, D; Dragovitsch, P; Dugger, M; Dytman, S; Eckhause, M; Egiyan, H; Egiyan, KS; Elouadrhiri, L; Empl, A; Farhi, L; Fatemi, R; Feuerbach, RJ; Ficenec, J; Forest, TA; Frolov, V; Funsten, H; Gaff, SJ; Gai, M; Garçon, M; Gavalian, G; Gilad, S; Gilfoyle, GP; Giovanetti, KL; Girard, P; Golovatch, E; Griffioen, K; Guidal, M; Guillo, M; Gyurjyan, V; Hadjidakis, C; Hancock, D; Hardie, J; Heddle, D; Heimberg, P; Hersman, FW; Hicks, K; Hicks, RS; Holtrop, M; Hu, J; Hyde-Wright, CE; Ishkanov, BS; Ito, MM; Jenkins, D; Joo, K; Kelley, JH; Kellie, JD; Khandaker, M

authors

abstract

  • The double spin asymmetry for the →e→p → e;π+ n channel was measured for the first time. A comparison with phenomenological models showed the high sensitivity of this observable to resonance contributions. The sign and magnitude of the measured assymmetry indicate the dominance of the helicity-1/2 contribution in the reaction, in contrast with the helicity-3/2 dominance observed at the photon point.

publication date

  • February 25, 2002

published in

volume

  • 88

issue

  • 8