Neutral-pion electroproduction on the proton near threshold

The double-differential coincidence cross section for the reaction {sup 1}H({ital e},{ital e}{prime}{ital p}){pi}{sup 0} has been measured at {ital Q}{sup 2}=0.1(GeV/{ital c}){sup 2} in a range in the invariant mass of 2--14 MeV above threshold. From the angular dependence of the data values of the...

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Veröffentlicht in:Physical Review Letters 1995-05, Vol.74 (18), p.3561-3564
Hauptverfasser: van den Brink HB, Blok, HP, Bobeldijk, I, I, Bouwhuis, M, Dodge, GE, Harakeh, MN, Hesselink, WH, Ireland, DG, de Jager CW, Jans, E, de Jonge N, Kalantar-Nayestanaki, N, Kasdorp, WJ, Ketel, TJ, Konijn, J, Lapikás, L, van Leeuwe JJ, van der Meer RL, Nooren, GJ, Norum, BE, Passchier, E, Pellegrino, AR, Spaltro, CM, van der Steenhoven G, Steijger, JJ, Templon, JA, Theunissen, JA, van Uden MA, de Vries H, de Vries R, de Witt Huberts PK
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Sprache:eng
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Zusammenfassung:The double-differential coincidence cross section for the reaction {sup 1}H({ital e},{ital e}{prime}{ital p}){pi}{sup 0} has been measured at {ital Q}{sup 2}=0.1(GeV/{ital c}){sup 2} in a range in the invariant mass of 2--14 MeV above threshold. From the angular dependence of the data values of the pion {ital s}-wave multipoles {ital E}{sub 0+} and {ital L}{sub 0+} have been extracted. The results are compared to predictions from chiral perturbation theory and models based on an effective Lagrangian. None of the models is able to describe both the {ital E}{sub 0+} and the {ital L}{sub 0+} multipoles.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.74.3561