Measurement of Nuclear Transparency for the A(e,e′π+) Reaction

Clasie, B.; Qian, X.; Arrington, J.; Asaturyan, R.; Benmokhtar, F.; Boeglin, W.; Bosted, P.; Bruell, A.; Christy, M. E.; Chudakov, E.; Cosyn, W.; Dalton, M. M.; Daniel, A.; Day, D.; Dutta, D.; El Fassi, L.; Ent, R.; Fenker, H. C.; Ferrer, J.; Fomin, N.; Gao, H.; Garrow, K.; Gaskell, D.; Gray, C.; Horn, T.; Huber, G. M.; Jones, M. K.; Kalantarians, N.; Keppel, C. E.; Kramer, K.; Larson, A.; Li, Y.; Liang, Y.; Lung, A. F.; Malace, S.; Markowitz, P.; Matsumura, A.; Meekins, D. G.; Mertens, T.; Miller, G. A.; Miyoshi, T.; Mkrtchyan, H.; Monson, R.; Navasardyan, T.; Niculescu, G.; Niculescu, I.; Okayasu, Y.; Opper, A. K.; Perdrisat, C.; Punjabi, V.; Rauf, A. W.; Rodriquez, V. M.; Rohe, D.; Ryckebusch, J.; Seely, J.; Segbefia, E.; Smith, G. R.; Strikman, M.; Sumihama, M.; Tadevosyan, V.; Tang, L.; Tvaskis, V.; Villano, A.; Vulcan, W. F.; Wesselmann, F. R.; Wood, S. A.; Yuan, L.; Zheng, X. C.

doi:10.1103/PhysRevLett.99.242502

Title: Measurement of Nuclear Transparency for the $A (e, e^{'} π^{+})$ Reaction

Journal Article · Sat Dec 01 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.99.242502· OSTI ID:909832

Clasie, B.; Qian, X.; Arrington, J.; Asaturyan, R.; Benmokhtar, F.; Boeglin, W.; Bosted, P.; Bruell, A.; Christy, M. E.; Chudakov, E.; Cosyn, W.; Dalton, M. M.; Daniel, A.; Day, D.; Dutta, D.; El Fassi, L.; Ent, R.; Fenker, H. C.; Ferrer, J.; Fomin, N. more »

We have measured the nuclear transparency of the A(e,e' pi^+) process in ^{2}H,^{12}C, ^{27}Al, ^{63}Cu and ^{197}Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q^2 = 1.1 - 4.7 (GeV/c)^2. The nuclear transparency was extracted as the super-ratio of $$(\sigma_A/\sigma_H)$$ from data to a model of pion-electroproduction from nuclei without pi-N final state interactions. The Q^2 and atomic number dependence of the nuclear transparency both show deviations from traditional nuclear physics expectations, and are consistent with calculations that include the quantum chromodynamical phenomenon of color transparency.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE - Office of Energy Research (ER)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 909832

Report Number(s):: JLAB-PHY-07-678; DOE/ER/40150-4287; arXiv:0707.1481; PRLTAO; TRN: US0703981

Journal Information:: Physical Review Letters, Vol. 99, Issue 24; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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