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Precision Measurement of the p(e,e′p)π0 Reaction at Threshold

Chirapatpimol, K (author)
Shabestari, M H (author)
Lindgren, R A (author)
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Smith, L C (author)
Annand, J R M (author)
Higinbotham, D W (author)
Moffit, B (author)
Nelyubin, V (author)
Norum, B E (author)
Allada, K (author)
Aniol, K (author)
Ardashev, K (author)
Armstrong, D S (author)
Arndt, R A (author)
Benmokhtar, F (author)
Bernstein, A M (author)
Bertozzi, W (author)
Briscoe, W J (author)
Bimbot, L (author)
Camsonne, A (author)
Chen, J-P (author)
Choi, S (author)
Chudakov, E (author)
Cisbani, E (author)
Cusanno, F (author)
Dalton, M M (author)
Dutta, C (author)
Egiyan, K (author)
Fernàndez-Ramìrez, C (author)
Feuerbach, R (author)
Fissum, Kevin (author)
Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
Frullani, S (author)
Garibaldi, F (author)
Gayou, O (author)
Gilman, R (author)
Gilad, S (author)
Goity, J (author)
Gomez, J (author)
Hahn, B (author)
Hamilton, D (author)
Hansen, J-O (author)
Huang, J (author)
Igarashi, R (author)
Ireland, D (author)
de Jager, C W (author)
Jin, X (author)
Jiang, X (author)
Jinasundera, T (author)
Kellie, J (author)
Keppel, C E (author)
Kolb, N (author)
LeRose, J (author)
Liyanage, N (author)
Livingston, K (author)
McNulty, D (author)
Mercado, L (author)
Michaels, R (author)
Mihovilovič, M (author)
Qian, S (author)
Qian, X (author)
Mailyan, S (author)
Mamyan, V (author)
Marrone, S (author)
Monaghan, P (author)
Nanda, S (author)
Perdrisat, C F (author)
Piasetzky, E (author)
Protopopescu, D (author)
Punjabi, V (author)
Qiang, Y (author)
Rachek, I A (author)
Rakhman, A (author)
Riordan, S (author)
Ron, G (author)
Rosner, G (author)
Saha, A (author)
Sawatzky, B (author)
Shahinyan, A (author)
Širca, S (author)
Sparveris, N (author)
Subedi, R R (author)
Suleiman, R (author)
Strakovsky, I (author)
Sulkosky, V (author)
Moinelo, J (author)
Voskanyan, H (author)
Wang, K (author)
Wang, Y (author)
Watson, J (author)
Watts, D (author)
Wojtsekhowski, B (author)
Workman, R L (author)
Yao, H (author)
Zhan, X (author)
Zhang, Y (author)
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 (creator_code:org_t)
2015
2015
English.
In: Physical Review Letters. - 1079-7114. ; 114:19
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Publication and Content Type

art (subject category)
ref (subject category)

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