Precision measurement of the p(e,e′p)π0 reaction at threshold

Chirapatpimol, K. et al. (2015) Precision measurement of the p(e,e′p)π0 reaction at threshold. Physical Review Letters, 114(19), 192503. (doi: 10.1103/PhysRevLett.114.192503) (PMID:26024167)

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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 ϕ∗π and θ∗π 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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Protopopescu, Dr Dan and Livingston, Dr Kenneth and Ireland, Professor David and Annand, Dr John and Kellie, Dr James and Hamilton, Dr David and Rosner, Professor Guenther
Authors: 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., and Zhang, Y.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
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