학술논문
Deep exclusive electroproduction of $π^0$ at high $Q^2$ in the quark valence regime
Document Type
article
Author
Collaboration, The Jefferson Lab Hall A; Dlamini, M; Karki, B; Ali, SF; Lin, P-J; Georges, F; Ko, H-S; Israel, N; Rashad, MNH; Stefanko, A; Adikaram, D; Ahmed, Z; Albataineh, H; Aljawrneh, B; Allada, K; Allison, S; Alsalmi, S; Androic, D; Aniol, K; Annand, J; Atac, H; Averett, T; Gayoso, C Ayerbe; Bai, X; Bane, J; Barcus, S; Bartlett, K; Bellini, V; Beminiwattha, R; Bericic, J; Biswas, D; Brash, E; Bulumulla, D; Campbell, J; Camsonne, A; Carmignotto, M; Castellano, J; Chen, C; Chen, J-P; Chetry, T; Christy, ME; Cisbani, E; Clary, B; Cohen, E; Compton, N; Cornejo, JC; Dusa, S Covrig; Crowe, B; Danagoulian, S; Danley, T; Persio, F De; Deconinck, W; Defurne, M; Desnault, C; Di, D; Duer, M; Duran, B; Ent, R; Fanelli, C; Franklin, G; Fuchey, E; Gal, C; Gaskell, D; Gautam, T; Glamazdin, O; Gnanvo, K; Gray, VM; Gu, C; Hague, T; Hamad, G; Hamilton, D; Hamilton, K; Hansen, O; Hauenstein, F; Henry, W; Higinbotham, DW; Holmstrom, T; Horn, T; Huang, Y; Huber, GM; Hyde, C; Ibrahim, H; Jen, C-M; Jin, K; Jones, M; Kabir, A; Keppel, C; Khachatryan, V; King, PM; Li, S; Li, W; Liu, J; Liu, H; Liyanage, A; Magee, J; Malace, S; Mammei, J; Markowitz, P; McClellan, E; Meddi, F
Source
Subject
Language
Abstract
We report measurements of the exclusive neutral pion electroproduction crosssection off protons at large values of $x_B$ (0.36, 0.48 and 0.60) and $Q^2$(3.1 to 8.4 GeV$^2$) obtained from Jefferson Lab Hall A experiment E12-06-014.The corresponding structure functions $d\sigma_L/dt+\epsilon d\sigma_T/dt$,$d\sigma_{TT}/dt$, $d\sigma_{LT}/dt$ and $d\sigma_{LT'}/dt$ are extracted as afunction of the proton momentum transfer $t-t_{min}$. The results suggest theamplitude for transversely polarized virtual photons continues to dominate thecross-section throughout this kinematic range. The data are well described bycalculations based on transversity Generalized Parton Distributions coupled toa helicity flip Distribution Amplitude of the pion, thus providing a unique wayto probe the structure of the nucleon.