First measurement of the double spin asymmetry in (e)over- right-arrow(p)over-right-arrow → e 'pi(+) in the resonance region

De Vita, R. et al. (2002) First measurement of the double spin asymmetry in (e)over- right-arrow(p)over-right-arrow → e 'pi(+) in the resonance region. Physical Review Letters, 88(8), (doi:10.1103/PhysRevLett.88.082001)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.88.082001

Abstract

The double spin asymmetry in the (e) over right arrow(p) over right arrow → e' pi(+) n reaction has been measured for the first time in the resonance region for four-momentum transfer Q(2) = 0.35-1.5 GeV2. 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 A(1) for the F-15(1680) resonance than expected from the analysis of the unpolarized data.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Livingston, Dr Kenneth and Kellie, Dr James and Protopopescu, Dr Dan
Authors: De Vita, R., Anghinolfi, M., Burkert, V.D., Dodge, G.E., Minehart, R., Taiuti, M., Weller, H., Adams, G., Amaryan, M.J., Anciant, E., Armstrong, D.S., Asavapibhop, B., Asryan, G., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Ball, J.P., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bianchi, N., Biselli, A.S., Boiarinov, S., Bonner, B.E., Bosted, P., Bouchigny, S., Branford, D., Brooks, W.K., Bueltmann, S., Calarco, J.R., Capitani, G.P., Carman, D.S., Carnahan, B., Cazes, A., Ciciani, L., Cole, P.L., Coleman, A., Connelly, J., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J.P., De Sanctis, E., Degtyarenko, P.V., Demirchyan, R., Denizli, H., Dennis, L., Dharmawardane, K.V., Dhuga, K.S., Djalali, C., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Eckhause, M., Egiyan, H., Egiyan, K.S., Elouadrhiri, L., Empl, A., Farhi, L., Fatemi, R., Feuerbach, R.J., Ficenec, J., Forest, T.A., Frolov, V., Funsten, H., Gaff, S.J., Gai, M., Garcon, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K.L., Girard, P., Golovatch, E., Griffioen, K., Guidal, M., Guillo, M., Gyurjyan, V., Hadjidakis, C., Hancock, D., Hardie, J., Heddle, D., Heimberg, P., Hersman, F.W., Hicks, K., Hicks, R.S., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ishkanov, B.S., Ito, M.M., Jenkins, D., Joo, K., Kelley, J.H., Kellie, J.D., Khandaker, M., Kim, K.Y., Kim, K., Kim, W., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Kramer, L.H., Kuang, Y., Kuhn, S.E., Lachniet, J., Laget, J.M., Lawrence, D., Li, J., Livingston, K., Longhi, A., Loukachine, K., Lucas, M., Major, W., Manak, J.J., Marchand, C., McAleer, S., McCarthy, J., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Muccifora, V., Mueller, J., Mutchler, G.S., Napolitano, J., Nelson, S.O., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niyazov, R.A., Opper, A.K., O'Rielly, G.V., Osipenko, M., Park, K., Pasyuk, E., Peterson, G., Philips, S.A., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Prok, Y., Protopopescu, D., Qin, L.M., Raue, B.A., Reolon, A.R., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Rock, S., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Sabourov, K., Salgado, C., Sapunenko, V., Sargsyan, M., Schumacher, R.A., Serov, V.S., Shafi, A., Sharabian, Y.G., Shaw, J., Skabelin, A.V., Smith, E.S., Smith, T., Smith, L.C., Sober, D.I., Sorrell, L., Spraker, M., Stavinsky, A., Stepanyan, S., Stoler, P., Strakovsky, I.I., Taylor, S., Tedeschi, D.J., Thompson, R., Todor, L., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Wang, K., Weinstein, L.B., Weisberg, A., Weygand, D.P., Whisnant, C.S., Wolin, E., Yegneswaran, A., Yun, J., Zhang, B., Zhao, J., and Zhou, Z.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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