Precision Measurement of the p(e,e′p)π[superscript 0] Reaction at Threshold

Chirapatpimol, K.; Shabestari, M.H.; Lindgren, R.A.; Smith, L.C.; Annand, J.R.M.; Higinbotham, D.W.; Moffit, B.; Nelyubin, V.; Norum, B.E.; Allada, K.; Aniol, K.; Ardashev, K.; Armstrong, D.S.; Arndt, R.A.; Benmokhtar, F.; Bernstein, A.M.; Bertozzi, W.; Briscoe, W.J.; Bimbot, L.; Camsonne, A.; Chen, J.-P.; Choi, S.; Chudakov, E.; Cisbani, E.; Cusanno, F.; Dalton, M. M.; Dutta, C.; Egiyan, K.; Fernàndez-Ramìrez, C.; Feuerbach, R.; Fissum, K.G.; Frullani, S.; Garibaldi, F.; Gayou, O.; Gilman, R.; Gilad, S.; Goity, J.; Gomez, J.; Hahn, B.; Hamilton, D.; Hansen, J.-O.; Huang, J.; Igarashi, R.; Ireland, D.; de Jager, C.W.; Jin, X.; Jiang, X.; Jinasundera, T.; Kellie, J.; Keppel, C.E.; Kolb, N.; LeRose, J.; Liyanage, N.; Livingston, K.; McNulty, D.; Mercado, L.; Michaels, R.; Mihovilovič, M.; Qian, S.; Qian, X.; Mailyan, S.; Mamyan, V.; Marrone, S.; Monaghan, P.; Nanda, S.; Perdrisat, C.F.; Piasetzky, E.; Protopopescu, D.; Punjabi, V.; Qiang, Y.; Rachek, I.A.; Rakhman, A.; Riordan, S.; Ron, G.; Rosner, G.; Saha, A.; Sawatzky, B.; Shahinyan, A.; Širca, S.; Sparveris, N.; Subedi, R.R.; Suleiman, R.; Strakovsky, I.; Sulkosky, V.; Moinelo, J.; Voskanyan, H.; Wang, K.; Wang, Y.; Watson, J.; Watts, D.; Wojtsekhowski, B.; Workman, R.L.; Yao, H.; Zhan, X.; Zhang, Y.

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Chirapatpimol, K.; Shabestari, M. H.; Lindgren, R. A.; Smith, L. C.; Annand, J. R. M.; ... Show more

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Abstract

New results are reported from a measurement of π[superscript 0] electroproduction near threshold using the p(e,e[superscript ′]p)π[superscript 0] 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 ϕ[* over π] and θ[* over π] angles in the pπ[superscript 0] center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q[superscript 2] coverage ranges from 0.05 to 0.155 (GeV/c)[superscript 2] in fine steps. A simple phenomenological analysis of our data shows strong disagreement with p-wave predictions from ChPT for Q[superscript 2] > 0.07 (GeV/c)[superscript 2], while the s-wave predictions are in reasonable agreement.

Date issued

2015-05

URI

http://hdl.handle.net/1721.1/96985

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review Letters

Publisher

American Physical Society

Citation

Chirapatpimol, K., M.H. Shabestari, R.A. Lindgren, L.C. Smith, J.R.M. Annand, D.W. Higinbotham, B. Moffit, et al. “Precision Measurement of the p(e,e′p)π[superscript 0] Reaction at Threshold.” Physical Review Letters 114, no. 19 (May 2015). © 2015 American Physical Society

Version: Final published version

ISSN

0031-9007

1079-7114

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