학술논문
Measurement of R = sigma_L / sigma_T and the Separated Longitudinal and Transverse Structure Functions in the Nucleon Resonance Region
Document Type
Working Paper
Author
Collaboration, The Jefferson Lab Hall C E94-110; Liang, Y.; Tvaskis, V.; Christy, M. E.; Ahmidouch, A.; Armstrong, C. S.; Arrington, J.; Asaturyan, R.; Avery, S.; Baker, O. K.; Beck, D. H.; Blok, H. P.; Bochna, C. W.; Boeglin, W.; Bosted, P.; Bouwhuis, M.; Breuer, H.; Brown, D. S.; Bruell, A.; Carlini, R. D.; Cha, J.; Chant, N. S.; Cochran, A.; Cole, L.; Danagoulian, S.; Day, D. B.; Dunne, J.; Dutta, D.; Ent, R.; Fenker, H. C.; Fox, B.; Gan, L.; Gao, H.; Garrow, K.; Gaskell, D.; Gasparian, A.; Geesaman, D. F.; Gilman, R.; Gu`eye, P. L. J.; Harvey, M.; Holt, R. J.; Jiang, X.; Jones, M.; Keppel, C. E.; Kinney, E.; Lorenzon, W.; Lung, A.; Mack, D. J.; Markowitz, P.; Martin, J. W.; McIlhany, K.; McKee, D.; Meekins, D.; Miller, M. A.; Milner, R. G.; Mitchell, J. H.; Mkrtchyan, H.; Mueller, B. A.; Nathan, A.; Niculescu, G.; Niculescu, I.; O'Neill, T. G.; Papavassiliou, V.; Pate, S. F.; Piercey, R. B.; Potterveld, D.; Ransome, R. D.; Reinhold, J.; Rollinde, E.; Rondon, O.; Roos, P.; Sarty, A. J.; Sawafta, R.; Schulte, E. C.; Segbefia, E.; Smith, C.; Stepanyan, S.; Strauch, S.; Tadevosyan, V.; Tang, L.; Tieulent, R.; Uzzle, A.; Vulcan, W. F.; Wood, S. A.; Xiong, F.; Yuan, L.; Zeier, M.; Zihlmann, B.; Ziskin, V.
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Subject
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Abstract
We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 < Q^2 < 5.5 GeV^2. The data have been used to accurately perform 167 Rosenbluth-type longitudinal / transverse separations. The precision R = sigma_L / sigma_T data are presented here, along with the first separate values of the inelastic structure functions F_1 and F_L in this regime. The resonance longitudinal component is found to be significant, both in magnitude and in the existence of defined mass peaks. Additionally, quark-hadron duality is here observed above Q^2 = 1 GeV^2 in the separated structure functions independently.
Comment: 5 pages, 4 figures
Comment: 5 pages, 4 figures