학술논문
Measurement of the Nucleon $F^n_2/F^p_2$ Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment
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Collaboration, MARATHON; Abrams, D; Albataineh, H; Aljawrneh, BS; Alsalmi, S; Aniol, K; Armstrong, W; Arrington, J; Atac, H; Averett, T; Gayoso, C Ayerbe; Bai, X; Bane, J; Barcus, S; Beck, A; Bellini, V; Bhatt, H; Bhetuwal, D; Biswas, D; Blyth, D; Boeglin, W; Bulumulla, D; Butler, J; Camsonne, A; Carmignotto, M; Castellanos, J; Chen, J-P; Cohen, EO; Covrig, S; Craycraft, K; Cruz-Torres, R; Dongwi, B; Duran, B; Dutta, D; Fuchey, E; Gal, C; Gautam, TN; Gilad, S; Gnanvo, K; Gogami, T; Gomez, J; Gu, C; Habarakada, A; Hague, T; Hansen, J-O; Hattawy, M; Hauenstein, F; Higinbotham, DW; Holt, RJ; Hughes, EW; Hyde, C; Ibrahim, H; Jian, S; Joosten, S; Karki, A; Karki, B; Katramatou, AT; Keith, C; Keppel, C; Khachatryan, M; Khachatryan, V; Khanal, A; Kievsky, A; King, D; King, PM; Korover, I; Kulagin, SA; Kumar, KS; Kutz, T; Lashley-Colthirst, N; Li, S; Li, W; Liu, H; Liuti, S; Liyanage, N; Markowitz, P; McClellan, RE; Meekins, D; Beck, S Mey-Tal; Meziani, Z-E; Michaels, R; Mihovilovic, M; Nelyubin, V; Nguyen, D; Nuruzzaman; Nycz, M; Obrecht, R; Olson, M; Owen, VF; Pace, E; Pandey, B; Pandey, V; Paolone, M; Papadopoulou, A; Park, S; Paul, S; Petratos, GG; Petti, R; Piasetzky, E; Pomatsalyuk, R
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Abstract
The ratio of the nucleon $F_2$ structure functions, $F_2^n/F_2^p$, isdetermined by the MARATHON experiment from measurements of deep inelasticscattering of electrons from $^3$H and $^3$He nuclei. The experiment wasperformed in the Hall A Facility of Jefferson Lab and used two high resolutionspectrometers for electron detection, and a cryogenic target system whichincluded a low-activity tritium cell. The data analysis used a novel techniqueexploiting the mirror symmetry of the two nuclei, which essentially eliminatesmany theoretical uncertainties in the extraction of the ratio. The results,which cover the Bjorken scaling variable range $0.19 < x < 0.83$, represent asignificant improvement compared to previous SLAC and Jefferson Labmeasurements for the ratio. They are compared to recent theoreticalcalculations and empirical determinations of the $F_2^n/F_2^p$ ratio.