Measurement of the generalized form factors near threshold via gamma* p -> n pi(+) at high Q(2)

Academic Article

Abstract

  • We report the first extraction of the pion-nucleon multipoles near the production threshold for the $n\pi^+$ channel at relatively high momentum transfer ($Q^2$ up to 4.2 $\rm{GeV^2}$). The dominance of the s-wave transverse multipole ($E_{0+}$), expected in this region, allowed us to access the generalized form factor $G_1$ within the light-cone sum rule (LCSR) framework as well as the axial form factor $G_A$. The data analyzed in this work were collected by the nearly $4\pi$ CEBAF Large Acceptance Spectrometer (CLAS) using a 5.754 $\rm{GeV}$ electron beam on a proton target. The differential cross section and the $\pi-N$-multipole $E_{0+}/G_D$ were measured using two different methods, the LCSR and a direct multipole fit. The results from the two methods are found to be consistent and almost $Q^2$ independent.
  • Authors

  • Park, K
  • Gothe, RW
  • Adhikari, KP
  • Adikaram, D
  • Anghinolfi, M
  • Baghdasaryan, H
  • Ball, J
  • Battaglieri, M
  • Batourine, V
  • Bedlinskiy, I
  • Bennett, RP
  • Biselli, AS
  • Bookwalter, C
  • Boiarinov, S
  • Branford, D
  • Briscoe, WJ
  • Brooks, WK
  • Burkert, VD
  • Carman, DS
  • Celentano, A
  • Chandavar, S
  • Charles, G
  • Cole, PL
  • Contalbrigo, M
  • Crede, V
  • D'Angelo, A
  • Daniel, A
  • Dashyan, N
  • De Vita, R
  • De Sanctis, E
  • Deur, A
  • Djalali, C
  • Doughty, D
  • Dupre, R
  • El Alaoui, A
  • El Fassi, L
  • Eugenio, P
  • Fedotov, G
  • Fradi, A
  • Gabrielyan, MY
  • Gevorgyan, N
  • Gilfoyle, GP
  • Giovanetti, KL
  • Girod, FX
  • Goetz, JT
  • Gohn, W
  • Golovatch, E
  • Graham, L
  • Griffioen, KA
  • Guidal, M
  • Guo, L
  • Hafidi, K
  • Hakobyan, H
  • Hanretty, C
  • Heddle, D
  • Hicks, K
  • Holtrop, Maurik
  • Hyde, CE
  • Ilieva, Y
  • Ireland, DG
  • Ishkhanov, BS
  • Isupov, EL
  • Jenkins, D
  • Jo, HS
  • Joo, K
  • Kalantarians, N
  • Khandaker, M
  • Khetarpal, P
  • Kim, A
  • Kim, W
  • Klein, A
  • Klein, FJ
  • Kubarovsky, A
  • Kubarovsky, V
  • Kuhn, SE
  • Kuleshov, SV
  • Kvaltine, ND
  • Livingston, K
  • Lu, HY
  • MacGregor, IJD
  • Markov, N
  • Mayer, M
  • McKinnon, B
  • Mestayer, MD
  • Meyer, CA
  • Mineeva, T
  • Mirazita, M
  • Mokeev, V
  • Moutarde, H
  • Munevar, E
  • Nadel-Turonski, P
  • Nasseripour, R
  • Niccolai, S
  • Niculescu, G
  • Niculescu, I
  • Osipenko, M
  • Ostrovidov, AI
  • Paolone, M
  • Pappalardo, L
  • Paremuzyan, R
  • Park, S
  • Pereira, S Anefalos
  • Phelps, E
  • Pisano, S
  • Pogorelko, O
  • Pozdniakov, S
  • Price, JW
  • Procureur, S
  • Prok, Y
  • Ricco, G
  • Rimal, D
  • Ripani, M
  • Ritchie, BG
  • Rosner, G
  • Rossi, P
  • Sabatie, F
  • Saini, MS
  • Salgado, C
  • Schott, D
  • Schumacher, RA
  • Seraydaryan, H
  • Sharabian, YG
  • Smith, ES
  • Smith, GD
  • Sober, DI
  • Sokhan, D
  • Stepanyan, SS
  • Stepanyan, S
  • Stoler, P
  • Strakovsky, II
  • Strauch, S
  • Taiuti, M
  • Tang, W
  • Taylor, CE
  • Tian, Y
  • Tkachenko, S
  • Trivedi, A
  • Ungaro, M
  • Vernarsky, B
  • Vlassov, AV
  • Voutier, E
  • Watts, DP
  • Weygand, DP
  • Wood, MH
  • Zachariou, N
  • Zhao, B
  • Zhao, ZW
  • Collaboration, CLAS
  • Status

    Publication Date

  • March 26, 2012
  • Published In

    Keywords

  • nucl-ex
  • Digital Object Identifier (doi)

    Start Page

  • 035208
  • End Page

  • 035208
  • Volume

  • 85
  • Issue

  • 3