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Precision Measurement of the p(e,e′p)π0 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 and Allada, K, et al. (2015) In Physical Review Letters 114(19).
Abstract
New results are reported from a measurement of π^{0} electroproduction near threshold using the p(e,e^{'}p)π^{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_{π}^{*} and θ_{π}^{*} angles in the pπ^{0} center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q^{2} coverage ranges from 0.05 to 0.155 (GeV/c)^{2} in fine steps. A simple phenomenological analysis of... (More)
New results are reported from a measurement of π^{0} electroproduction near threshold using the p(e,e^{'}p)π^{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_{π}^{*} and θ_{π}^{*} angles in the pπ^{0} center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q^{2} 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 Q^{2}>0.07 (GeV/c)^{2}, while the s-wave predictions are in reasonable agreement. (Less)
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Physical Review Letters
volume
114
issue
19
publisher
American Physical Society
external identifiers
  • pmid:26024167
  • wos:000354546100001
  • scopus:84930225261
ISSN
1079-7114
DOI
10.1103/PhysRevLett.114.192503
language
English
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446596db-5f8f-463e-9d52-457f48f04f9e (old id 5436259)
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2015-06-17 15:34:40
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@article{446596db-5f8f-463e-9d52-457f48f04f9e,
  abstract     = {New results are reported from a measurement of π^{0} electroproduction near threshold using the p(e,e^{'}p)π^{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_{π}^{*} and θ_{π}^{*} angles in the pπ^{0} center of mass was obtained for invariant energies above threshold from 0.5 up to 15 MeV. The 4-momentum transfer Q^{2} 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 Q^{2}>0.07 (GeV/c)^{2}, while the s-wave predictions are in reasonable agreement.},
  articleno    = {192503},
  author       = {Chirapatpimol, K and Shabestari, M H and Lindgren, R A and Smith, L C and Annand, J R M and Higinbotham, D W and Moffit, B and Nelyubin, V and Norum, B E and Allada, K and Aniol, K and Ardashev, K and Armstrong, D S and Arndt, R A and Benmokhtar, F and Bernstein, A M and Bertozzi, W and Briscoe, W J and Bimbot, L and Camsonne, A and Chen, J-P and Choi, S and Chudakov, E and Cisbani, E and Cusanno, F and Dalton, M M and Dutta, C and Egiyan, K and Fernàndez-Ramìrez, C and Feuerbach, R and Fissum, Kevin and Frullani, S and Garibaldi, F and Gayou, O and Gilman, R and Gilad, S and Goity, J and Gomez, J and Hahn, B and Hamilton, D and Hansen, J-O and Huang, J and Igarashi, R and Ireland, D and de Jager, C W and Jin, X and Jiang, X and Jinasundera, T and Kellie, J and Keppel, C E and Kolb, N and LeRose, J and Liyanage, N and Livingston, K and McNulty, D and Mercado, L and Michaels, R and Mihovilovič, M and Qian, S and Qian, X and Mailyan, S and Mamyan, V and Marrone, S and Monaghan, P and Nanda, S and Perdrisat, C F and Piasetzky, E and Protopopescu, D and Punjabi, V and Qiang, Y and Rachek, I A and Rakhman, A and Riordan, S and Ron, G and Rosner, G and Saha, A and Sawatzky, B and Shahinyan, A and Širca, S and Sparveris, N and Subedi, R R and Suleiman, R and Strakovsky, I and Sulkosky, V and Moinelo, J and Voskanyan, H and Wang, K and Wang, Y and Watson, J and Watts, D and Wojtsekhowski, B and Workman, R L and Yao, H and Zhan, X and Zhang, Y},
  issn         = {1079-7114},
  language     = {eng},
  number       = {19},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Precision Measurement of the p(e,e′p)π0 Reaction at Threshold},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.114.192503},
  volume       = {114},
  year         = {2015},
}