Experimental study of the A(e,e′π+) reaction on H1, H2, C12, Al27, Cu63, and Au197
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Cross sections for the H1(e,e′π+)n process on H1, H2, C12, Al27, Cu63, and Au197 targets were measured at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) to extract nuclear transparencies. Data were taken from Q2=1.1-4.7 GeV2 for a fixed center-of-mass energy of W=2.14 GeV. The ratio of σL and σT was extracted from the measured cross sections for H1, H2, C12, and Cu63 targets at Q2=2.15 and 4.0 GeV2, allowing for additional studies of the reaction mechanism. In this article, we present the experimental setup and the analysis of the data in detail, including systematic uncertainty studies. Differential cross sections and nuclear transparencies as a function of the pion momentum at different values of Q2 are presented. Our results are consistent with the predicted early onset of color transparency in mesons. Global features of the data are discussed and the data are compared with model calculations for the H1(e,e′π+)n reaction from nuclear targets. © 2010 The American Physical Society.
Published Version (Please cite this version)10.1103/PhysRevC.81.055209
Publication InfoQian, X; Horn, T; Clasie, B; Arrington, J; Asaturyan, R; Benmokhtar, F; ... Zheng, X (2010). Experimental study of the A(e,e′π+) reaction on H1, H2, C12, Al27, Cu63, and Au197. Physical Review C - Nuclear Physics, 81(5). pp. 55209. 10.1103/PhysRevC.81.055209. Retrieved from https://hdl.handle.net/10161/4261.
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Henry W. Newson Distinguished Professor of Physics
Prof. Gao's research focuses on understanding the structure of the nucleon in terms of quark and gluon degrees of freedom of Quantum Chromodynamics (QCD), search for QCD exotics, and fundamental symmetry studies at low energy to search for new physics beyond the Standard Model of electroweak interactions. Most recently, her group's studies of the structure of the nucleon have been focusing on a precision measurement of the proton (see