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Final analysis of proton form factor ratio data at Q(2)=4.0, 4.8, and 5.6 GeV2
- Puckett, A. J. R. (author)
- Brash, E. J. (author)
- Gayou, O. (author)
- show more...
- Jones, M. K. (author)
- Pentchev, L. (author)
- Perdrisat, C. F. (author)
- Punjabi, V. (author)
- Aniol, K. A. (author)
- Averett, T. (author)
- Benmokhtar, F. (author)
- Bertozzi, W. (author)
- Bimbot, L. (author)
- Calarco, J. R. (author)
- Cavata, C. (author)
- Chai, Z. (author)
- Chang, C. -C. (author)
- Chang, T. (author)
- Chen, J. P. (author)
- Chudakov, E. (author)
- De Leo, R. (author)
- Dieterich, S. (author)
- Endres, R. (author)
- Epstein, M. B. (author)
- Escoffier, S. (author)
- Fonvieille, H. (author)
- Frullani, S. (author)
- Gao, J. (author)
- Garibaldi, F. (author)
- Gilad, S. (author)
- Gilman, R. (author)
- Glamazdin, A. (author)
- Glashausser, C. (author)
- Gomez, J. (author)
- Hansen, J. -O. (author)
- Higinbotham, D. (author)
- Huber, G. M. (author)
- Iodice, M. (author)
- de Jager, C. W. (author)
- Jiang, X. (author)
- Khandaker, M. (author)
- Kozlov, S. (author)
- Kramer, K. M. (author)
- Kumbartzki, G. (author)
- LeRose, J. J. (author)
- Lhuillier, D. (author)
- Lindgren, R. A. (author)
- Liyanage, N. (author)
- Lolos, G. J. (author)
- Margaziotis, D. J. (author)
- Marie, F. (author)
- Markowitz, P. (author)
- McCormick, K. (author)
- Michaels, R. (author)
- Milbrath, B. D. (author)
- Nanda, S. K. (author)
- Neyret, D. (author)
- Piskunov, N. M. (author)
- Ransome, R. D. (author)
- Raue, B. A. (author)
- Roche, R. (author)
- Rvachev, M. (author)
- Salgado, C. (author)
- Sirca, S. (author)
- Sitnik, I. (author)
- Strauch, S. (author)
- Todor, L. (author)
- Tomasi-Gustafsson, E. (author)
- Urciuoli, G. M. (author)
- Voskanyan, H. (author)
- Wijesooriya, K. (author)
- Wojtsekhowski, B. B. (author)
- Zheng, X. (author)
- Zhu, L. (author)
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- (creator_code:org_t)
- 2012
- 2012
- English.
- In: Physical Review C (Nuclear Physics). - 0556-2813. ; 85:4
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- Precise measurements of the proton electromagnetic form factor ratio R = mu(p)G(E)(p)/G(M)(p) using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon structure by revealing the strong decrease of R with momentum transfer Q(2) for Q(2) greater than or similar to 1 GeV2, in strong disagreement with previous extractions of R from cross-section measurements. In particular, the polarization transfer results have exposed the limits of applicability of the one-photon-exchange approximation and highlighted the role of quark orbital angular momentum in the nucleon structure. The GEp-II experiment in Jefferson Lab's Hall A measured R at four Q(2) values in the range 3.5 GeV2 <= Q(2) <= 5.6 GeV2. A possible discrepancy between the originally published GEp-II results and more recent measurements at higher Q(2) motivated a new analysis of the GEp-II data. This article presents the final results of the GEp-II experiment, including details of the new analysis, an expanded description of the apparatus, and an overview of theoretical progress since the original publication. The key result of the final analysis is a systematic increase in the results for R, improving the consistency of the polarization transfer data in the high-Q(2) region. This increase is the result of an improved selection of elastic events which largely removes the systematic effect of the inelastic contamination, underestimated by the original analysis.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
- Puckett, A. J. R ...
- Brash, E. J.
- Gayou, O.
- Jones, M. K.
- Pentchev, L.
- Perdrisat, C. F.
- show more...
- Punjabi, V.
- Aniol, K. A.
- Averett, T.
- Benmokhtar, F.
- Bertozzi, W.
- Bimbot, L.
- Calarco, J. R.
- Cavata, C.
- Chai, Z.
- Chang, C. -C.
- Chang, T.
- Chen, J. P.
- Chudakov, E.
- De Leo, R.
- Dieterich, S.
- Endres, R.
- Epstein, M. B.
- Escoffier, S.
- Fissum, Kevin
- Fonvieille, H.
- Frullani, S.
- Gao, J.
- Garibaldi, F.
- Gilad, S.
- Gilman, R.
- Glamazdin, A.
- Glashausser, C.
- Gomez, J.
- Hansen, J. -O.
- Higinbotham, D.
- Huber, G. M.
- Iodice, M.
- de Jager, C. W.
- Jiang, X.
- Khandaker, M.
- Kozlov, S.
- Kramer, K. M.
- Kumbartzki, G.
- LeRose, J. J.
- Lhuillier, D.
- Lindgren, R. A.
- Liyanage, N.
- Lolos, G. J.
- Margaziotis, D. ...
- Marie, F.
- Markowitz, P.
- McCormick, K.
- Michaels, R.
- Milbrath, B. D.
- Nanda, S. K.
- Neyret, D.
- Piskunov, N. M.
- Ransome, R. D.
- Raue, B. A.
- Roche, R.
- Rvachev, M.
- Salgado, C.
- Sirca, S.
- Sitnik, I.
- Strauch, S.
- Todor, L.
- Tomasi-Gustafsso ...
- Urciuoli, G. M.
- Voskanyan, H.
- Wijesooriya, K.
- Wojtsekhowski, B ...
- Zheng, X.
- Zhu, L.
- show less...
- About the subject
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- and Subatomic Physic ...
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- Physical Review ...
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- Lund University
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