Measurement of the proton spin structure function g1(x,Q2) for Q2 from 0.15 to 1.6 GeV2 with CLAS.

Academic Article

Abstract

  • Double-polarization asymmetries for inclusive ep scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH3 target in the CLAS detector. The polarized structure function g(1)(x,Q2) was extracted throughout the nucleon resonance region and into the deep inelastic regime, for Q(2)=0.15-1.64 GeV2. The contributions to the first moment Gamma(1)(Q2)= integral g(1)(x,Q2) dx were determined up to Q(2)=1.2 GeV2. Using a parametrization for g(1) in the unmeasured low x regions, the complete first moment was estimated over this Q2 region. A rapid change in Gamma(1) is observed for Q2<1 GeV2, with a sign change near Q(2)=0.3 GeV2, indicating dominant contributions from the resonance region. At Q(2)=1.2 GeV2 our data are below the perturbative QCD evolved scaling value.
  • Authors

  • Fatemi, R
  • Skabelin, AV
  • Burkert, VD
  • Crabb, D
  • De Vita, R
  • Kuhn, SE
  • Minehart, R
  • Adams, G
  • Anciant, E
  • Anghinolfi, M
  • Asavapibhop, B
  • Audit, G
  • Auger, T
  • Avakian, H
  • Bagdasaryan, H
  • Ball, JP
  • Barrow, S
  • Battaglieri, M
  • Beard, K
  • Bektasoglu, M
  • Bellis, M
  • Bertozzi, W
  • Bianchi, N
  • Biselli, AS
  • Boiarinov, S
  • Bonner, BE
  • Bosted, PE
  • Bouchigny, S
  • Bradford, R
  • Branford, D
  • Brooks, WK
  • Butuceanu, C
  • Calarco, JR
  • Carman, DS
  • Carnahan, B
  • Cetina, C
  • Ciciani, L
  • Clark, R
  • Cole, PL
  • Coleman, A
  • Connelly, J
  • Cords, D
  • Corvisiero, P
  • Crannell, H
  • Cummings, JP
  • De Sanctis, E
  • Degtyarenko, PV
  • Denizli, H
  • Dennis, L
  • Dharmawardane, KV
  • Dhuga, KS
  • Djalali, C
  • Dodge, GE
  • Doughty, D
  • Dragovitsch, P
  • Dugger, M
  • Dytman, S
  • Eckhause, M
  • Egiyan, H
  • Egiyan, KS
  • Elouadrhiri, L
  • Empl, A
  • Eugenio, P
  • Farhi, L
  • Feuerbach, RJ
  • Freyberger, A
  • Ficenec, J
  • Forest, TA
  • Frolov, V
  • Funsten, H
  • Gaff, SJ
  • Garçon, M
  • Gavalian, G
  • Gilad, S
  • Gilfoyle, GP
  • Giovanetti, KL
  • Girard, P
  • Gordon, CIO
  • Griffioen, KA
  • Guidal, M
  • Guillo, M
  • Guo, L
  • Gyurjyan, V
  • Hadjidakis, C
  • Hancock, D
  • Hardie, J
  • Heddle, D
  • Heimberg, P
  • Hersman, FW
  • Hicks, K
  • Hicks, RS
  • Holtrop, Maurik
  • Hu, J
  • Hyde-Wright, CE
  • Ilieva, Y
  • Ito, MM
  • Jenkins, D
  • Joo, K
  • Keith, C
  • Kelley, JH
  • Kellie, JD
  • Khandaker, M
  • Kim, KY
  • Kim, K
  • Kim, W
  • Klein, A
  • Klein, FJ
  • Klimenko, AV
  • Klusman, M
  • Kossov, M
  • Koubarovski, V
  • Kramer, LH
  • Kuang, Y
  • Kuhn, J
  • Lachniet, J
  • Laget, JM
  • Lawrence, D
  • Li, Ji
  • Livingston, K
  • Longhi, A
  • Lukashin, K
  • Major, W
  • Manak, JJ
  • Marchand, C
  • McAleer, S
  • McNabb, JWC
  • Mecking, BA
  • Mehrabyan, S
  • Mestayer, MD
  • Meyer, CA
  • Mikhailov, K
  • Mirazita, M
  • Miskimen, R
  • Morand, L
  • Morrow, SA
  • Muccifora, V
  • Mueller, J
  • Mutchler, GS
  • Napolitano, J
  • Nasseripour, R
  • Nelson, SO
  • Niccolai, S
  • Niculescu, G
  • Niculescu, I
  • Niczyporuk, BB
  • Niyazov, RA
  • Nozar, M
  • O'Brien, JT
  • O'Rielly, GV
  • Osipenko, M
  • Park, K
  • Pasyuk, E
  • Peterson, G
  • Pivnyuk, N
  • Pocanic, D
  • Pogorelko, O
  • Polli, E
  • Pozdniakov, S
  • Preedom, BM
  • Price, JW
  • Prok, Y
  • Protopopescu, D
  • Qin, LM
  • Raue, BA
  • Riccardi, G
  • Ricco, G
  • Ripani, M
  • Ritchie, BG
  • Rock, SE
  • Ronchetti, F
  • Rossi, P
  • Rowntree, D
  • Rubin, PD
  • Sabatié, F
  • Sabourov, K
  • Salgado, C
  • Santoro, JP
  • Sapunenko, V
  • Sargsyan, M
  • Schumacher, RA
  • Seely, M
  • Serov, VS
  • Sharabian, YG
  • Shaw, J
  • Simionatto, S
  • Smith, ES
  • Smith, T
  • Smith, LC
  • Sober, DI
  • Sorrel, L
  • Spraker, M
  • Stavinsky, A
  • Stepanyan, S
  • Stoler, P
  • Strauch, S
  • Taiuti, M
  • Taylor, S
  • Tedeschi, DJ
  • Thoma, U
  • Thompson, R
  • Todor, L
  • Tur, C
  • Ungaro, M
  • Vineyard, MF
  • Vlassov, AV
  • Wang, K
  • Weinstein, LB
  • Weller, H
  • Weygand, DP
  • Whisnant, CS
  • Wolin, E
  • Wood, MH
  • Yegneswaran, A
  • Yun, J
  • Zhang, B
  • Zhao, J
  • Zhou, Z
  • CLAS Collaboration
  • Status

    Publication Date

  • November 28, 2003
  • Has Subject Area

    Published In

    Keywords

  • CLAS Collaboration
  • Digital Object Identifier (doi)

    Pubmed Id

  • 14683231
  • Start Page

  • 222002
  • Volume

  • 91
  • Issue

  • 22