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Precision measurement of the p (e,e'p)π0 reaction at threshold
Chirapatpimol, K Shabestari, MH Lindgren, RA Smith, LC Annand, JRM Higinbotham, DW Moffit, B Nelyubin, V Norum, BE Allada, K
Chirapatpimol, K
Shabestari, MH
Lindgren, RA
Smith, LC
Annand, JRM
Higinbotham, DW
Moffit, B
Nelyubin, V
Norum, BE
Allada, K
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Journal Article
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2015-05-13
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10.1103/PhysRevLett.114.192503
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© 2015 American Physical Society. New results are reported from a measurement of π0 electroproduction near threshold using the p(e,e'p)π0 reaction. The experiment was designed to determine precisely the energy dependence of s- and p-wave electromagnetic multipoles as a stringent test of the predictions of chiral perturbation theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the φπ∗ and θπ∗ angles in the pπ0 center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q2 coverage ranges from 0.05 to 0.155(GeV/c)2 in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q2>0.07(GeV/c)2, while the s-wave predictions are in reasonable agreement.
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Physical Review Letters
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