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1.	Zhu, LY, et al. (author) Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium 2003 In: Physical Review Letters. - 1079-7114. ; 91:2: 022003 Journal article (peer-reviewed)abstract We have measured the differential cross section for the gamman-->pi(-)p and gammap-->pi(+)n reactions at theta(c.m.)=90degrees in the photon energy range from 1.1 to 5.5 GeV at Jefferson Lab (JLab). The data at E(gamma)greater than or similar to3.3 GeV exhibit a global scaling behavior for both pi(-) and pi(+) photoproduction, consistent with the constituent counting rule and the existing pi(+) photoproduction data. Possible oscillations around the scaling value are suggested by these new data. The data show enhancement in the scaled cross section at a center-of-mass energy near 2.2 GeV. The cross section ratio of exclusive pi(-) to pi(+) photoproduction at high energy is consistent with the prediction based on one-hard-gluon-exchange diagrams.
2.	Strauch, S, et al. (author) Polarization transfer in the He-4((e)over-right-arrow,e '(p)over-right-arrow)H-3 reaction up to Q(2)=2.6 (GeV/c)(2) 2003 In: Physical Review Letters. - 1079-7114. ; 91:5: 052301 Journal article (peer-reviewed)abstract We have measured the proton recoil polarization in the He-4((e) over right arrow ,e(')(p) over right arrow)H-4 reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Jiang, X. (2); Chen, JP (2); Fissum, Kevin (2); Saha, A. (2); Chudakov, E (2); de Jager, CW (2); show more...; Dieterich, S (2); Frullani, S (2); Gilman, R (2); Glashausser, C (2); Gomez, J (2); Hansen, JO (2); Higinbotham, DW (2); Kumbartzki, G (2); Liyanage, N (2); Mitchell, J. (1); Xu, W (1); Kuss, M. (1); McCormick, K (1); Dutta, D (1); Kinney, E (1); Crawford, C. (1); Livingston, K. (1); Rosner, G. (1); Gao, H. (1); Jones, C (1); Annand, JRM (1); Aniol, KA (1); Arrington, J (1); Averett, T (1); Bertozzi, W (1); Brash, EJ (1); Chai, Z (1); Coman, M (1); De Leo, R (1); Epstein, MB (1); Finn, JM (1); Garibaldi, F (1); Gasparian, A (1); Gayou, O (1); Gilad, S (1); Gorbenko, V (1); Hyde-Wright, CE (1); Jones, MK (1); Kelly, JJ (1); Kramer, K (1); LeRose, JJ (1); Malov, S (1); Margaziotis, DJ (1); Markowitz, P (1); show less...

University: Lund University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2003 (2)Undo refine

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